/* * kmp_dispatch.cpp: dynamic scheduling - iteration initialization and dispatch. */ //===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.txt for details. // //===----------------------------------------------------------------------===// /* * Dynamic scheduling initialization and dispatch. * * NOTE: __kmp_nth is a constant inside of any dispatch loop, however * it may change values between parallel regions. __kmp_max_nth * is the largest value __kmp_nth may take, 1 is the smallest. * */ /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ // Need to raise Win version from XP to Vista here for support of InterlockedExchange64 #if defined(_WIN32_WINNT) && defined(_M_IX86) #undef _WIN32_WINNT #define _WIN32_WINNT 0x0502 #endif #include "kmp.h" #include "kmp_i18n.h" #include "kmp_itt.h" #include "kmp_str.h" #include "kmp_error.h" #include "kmp_stats.h" #if KMP_OS_WINDOWS && KMP_ARCH_X86 #include #endif #if OMPT_SUPPORT #include "ompt-internal.h" #include "ompt-specific.h" #endif /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ #if KMP_STATIC_STEAL_ENABLED // replaces dispatch_private_info{32,64} structures and dispatch_private_info{32,64}_t types template< typename T > struct dispatch_private_infoXX_template { typedef typename traits_t< T >::unsigned_t UT; typedef typename traits_t< T >::signed_t ST; UT count; // unsigned T ub; /* Adding KMP_ALIGN_CACHE here doesn't help / can hurt performance */ T lb; ST st; // signed UT tc; // unsigned T static_steal_counter; // for static_steal only; maybe better to put after ub /* parm[1-4] are used in different ways by different scheduling algorithms */ // KMP_ALIGN( 32 ) ensures ( if the KMP_ALIGN macro is turned on ) // a) parm3 is properly aligned and // b) all parm1-4 are in the same cache line. // Because of parm1-4 are used together, performance seems to be better // if they are in the same line (not measured though). struct KMP_ALIGN( 32 ) { // compiler does not accept sizeof(T)*4 T parm1; T parm2; T parm3; T parm4; }; UT ordered_lower; // unsigned UT ordered_upper; // unsigned #if KMP_OS_WINDOWS T last_upper; #endif /* KMP_OS_WINDOWS */ }; #else /* KMP_STATIC_STEAL_ENABLED */ // replaces dispatch_private_info{32,64} structures and dispatch_private_info{32,64}_t types template< typename T > struct dispatch_private_infoXX_template { typedef typename traits_t< T >::unsigned_t UT; typedef typename traits_t< T >::signed_t ST; T lb; T ub; ST st; // signed UT tc; // unsigned T parm1; T parm2; T parm3; T parm4; UT count; // unsigned UT ordered_lower; // unsigned UT ordered_upper; // unsigned #if KMP_OS_WINDOWS T last_upper; #endif /* KMP_OS_WINDOWS */ }; #endif /* KMP_STATIC_STEAL_ENABLED */ // replaces dispatch_private_info structure and dispatch_private_info_t type template< typename T > struct KMP_ALIGN_CACHE dispatch_private_info_template { // duplicate alignment here, otherwise size of structure is not correct in our compiler union KMP_ALIGN_CACHE private_info_tmpl { dispatch_private_infoXX_template< T > p; dispatch_private_info64_t p64; } u; enum sched_type schedule; /* scheduling algorithm */ kmp_uint32 ordered; /* ordered clause specified */ kmp_uint32 ordered_bumped; kmp_int32 ordered_dummy[KMP_MAX_ORDERED-3]; // to retain the structure size after making order dispatch_private_info * next; /* stack of buffers for nest of serial regions */ kmp_uint32 nomerge; /* don't merge iters if serialized */ kmp_uint32 type_size; enum cons_type pushed_ws; }; // replaces dispatch_shared_info{32,64} structures and dispatch_shared_info{32,64}_t types template< typename UT > struct dispatch_shared_infoXX_template { /* chunk index under dynamic, number of idle threads under static-steal; iteration index otherwise */ volatile UT iteration; volatile UT num_done; volatile UT ordered_iteration; UT ordered_dummy[KMP_MAX_ORDERED-3]; // to retain the structure size making ordered_iteration scalar }; // replaces dispatch_shared_info structure and dispatch_shared_info_t type template< typename UT > struct dispatch_shared_info_template { // we need union here to keep the structure size union shared_info_tmpl { dispatch_shared_infoXX_template< UT > s; dispatch_shared_info64_t s64; } u; volatile kmp_uint32 buffer_index; #if OMP_45_ENABLED volatile kmp_int32 doacross_buf_idx; // teamwise index kmp_uint32 *doacross_flags; // array of iteration flags (0/1) kmp_int32 doacross_num_done; // count finished threads #endif #if KMP_USE_HWLOC // When linking with libhwloc, the ORDERED EPCC test slowsdown on big // machines (> 48 cores). Performance analysis showed that a cache thrash // was occurring and this padding helps alleviate the problem. char padding[64]; #endif }; /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ #undef USE_TEST_LOCKS // test_then_add template (general template should NOT be used) template< typename T > static __forceinline T test_then_add( volatile T *p, T d ); template<> __forceinline kmp_int32 test_then_add< kmp_int32 >( volatile kmp_int32 *p, kmp_int32 d ) { kmp_int32 r; r = KMP_TEST_THEN_ADD32( p, d ); return r; } template<> __forceinline kmp_int64 test_then_add< kmp_int64 >( volatile kmp_int64 *p, kmp_int64 d ) { kmp_int64 r; r = KMP_TEST_THEN_ADD64( p, d ); return r; } // test_then_inc_acq template (general template should NOT be used) template< typename T > static __forceinline T test_then_inc_acq( volatile T *p ); template<> __forceinline kmp_int32 test_then_inc_acq< kmp_int32 >( volatile kmp_int32 *p ) { kmp_int32 r; r = KMP_TEST_THEN_INC_ACQ32( p ); return r; } template<> __forceinline kmp_int64 test_then_inc_acq< kmp_int64 >( volatile kmp_int64 *p ) { kmp_int64 r; r = KMP_TEST_THEN_INC_ACQ64( p ); return r; } // test_then_inc template (general template should NOT be used) template< typename T > static __forceinline T test_then_inc( volatile T *p ); template<> __forceinline kmp_int32 test_then_inc< kmp_int32 >( volatile kmp_int32 *p ) { kmp_int32 r; r = KMP_TEST_THEN_INC32( p ); return r; } template<> __forceinline kmp_int64 test_then_inc< kmp_int64 >( volatile kmp_int64 *p ) { kmp_int64 r; r = KMP_TEST_THEN_INC64( p ); return r; } // compare_and_swap template (general template should NOT be used) template< typename T > static __forceinline kmp_int32 compare_and_swap( volatile T *p, T c, T s ); template<> __forceinline kmp_int32 compare_and_swap< kmp_int32 >( volatile kmp_int32 *p, kmp_int32 c, kmp_int32 s ) { return KMP_COMPARE_AND_STORE_REL32( p, c, s ); } template<> __forceinline kmp_int32 compare_and_swap< kmp_int64 >( volatile kmp_int64 *p, kmp_int64 c, kmp_int64 s ) { return KMP_COMPARE_AND_STORE_REL64( p, c, s ); } /* Spin wait loop that first does pause, then yield. Waits until function returns non-zero when called with *spinner and check. Does NOT put threads to sleep. #if USE_ITT_BUILD Arguments: obj -- is higher-level synchronization object to report to ittnotify. It is used to report locks consistently. For example, if lock is acquired immediately, its address is reported to ittnotify via KMP_FSYNC_ACQUIRED(). However, it lock cannot be acquired immediately and lock routine calls to KMP_WAIT_YIELD(), the later should report the same address, not an address of low-level spinner. #endif // USE_ITT_BUILD */ template< typename UT > // ToDo: make inline function (move to header file for icl) static UT // unsigned 4- or 8-byte type __kmp_wait_yield( volatile UT * spinner, UT checker, kmp_uint32 (* pred)( UT, UT ) USE_ITT_BUILD_ARG(void * obj) // Higher-level synchronization object, or NULL. ) { // note: we may not belong to a team at this point register volatile UT * spin = spinner; register UT check = checker; register kmp_uint32 spins; register kmp_uint32 (*f) ( UT, UT ) = pred; register UT r; KMP_FSYNC_SPIN_INIT( obj, (void*) spin ); KMP_INIT_YIELD( spins ); // main wait spin loop while(!f(r = *spin, check)) { KMP_FSYNC_SPIN_PREPARE( obj ); /* GEH - remove this since it was accidentally introduced when kmp_wait was split. It causes problems with infinite recursion because of exit lock */ /* if ( TCR_4(__kmp_global.g.g_done) && __kmp_global.g.g_abort) __kmp_abort_thread(); */ // if we are oversubscribed, // or have waited a bit (and KMP_LIBRARY=throughput, then yield // pause is in the following code KMP_YIELD( TCR_4(__kmp_nth) > __kmp_avail_proc ); KMP_YIELD_SPIN( spins ); } KMP_FSYNC_SPIN_ACQUIRED( obj ); return r; } template< typename UT > static kmp_uint32 __kmp_eq( UT value, UT checker) { return value == checker; } template< typename UT > static kmp_uint32 __kmp_neq( UT value, UT checker) { return value != checker; } template< typename UT > static kmp_uint32 __kmp_lt( UT value, UT checker) { return value < checker; } template< typename UT > static kmp_uint32 __kmp_ge( UT value, UT checker) { return value >= checker; } template< typename UT > static kmp_uint32 __kmp_le( UT value, UT checker) { return value <= checker; } /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ static void __kmp_dispatch_deo_error( int *gtid_ref, int *cid_ref, ident_t *loc_ref ) { kmp_info_t *th; KMP_DEBUG_ASSERT( gtid_ref ); if ( __kmp_env_consistency_check ) { th = __kmp_threads[*gtid_ref]; if ( th -> th.th_root -> r.r_active && ( th -> th.th_dispatch -> th_dispatch_pr_current -> pushed_ws != ct_none ) ) { #if KMP_USE_DYNAMIC_LOCK __kmp_push_sync( *gtid_ref, ct_ordered_in_pdo, loc_ref, NULL, 0 ); #else __kmp_push_sync( *gtid_ref, ct_ordered_in_pdo, loc_ref, NULL ); #endif } } } template< typename UT > static void __kmp_dispatch_deo( int *gtid_ref, int *cid_ref, ident_t *loc_ref ) { typedef typename traits_t< UT >::signed_t ST; dispatch_private_info_template< UT > * pr; int gtid = *gtid_ref; // int cid = *cid_ref; kmp_info_t *th = __kmp_threads[ gtid ]; KMP_DEBUG_ASSERT( th -> th.th_dispatch ); KD_TRACE(100, ("__kmp_dispatch_deo: T#%d called\n", gtid ) ); if ( __kmp_env_consistency_check ) { pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_pr_current ); if ( pr -> pushed_ws != ct_none ) { #if KMP_USE_DYNAMIC_LOCK __kmp_push_sync( gtid, ct_ordered_in_pdo, loc_ref, NULL, 0 ); #else __kmp_push_sync( gtid, ct_ordered_in_pdo, loc_ref, NULL ); #endif } } if ( ! th -> th.th_team -> t.t_serialized ) { dispatch_shared_info_template< UT > * sh = reinterpret_cast< dispatch_shared_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_sh_current ); UT lower; if ( ! __kmp_env_consistency_check ) { pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_pr_current ); } lower = pr->u.p.ordered_lower; #if ! defined( KMP_GOMP_COMPAT ) if ( __kmp_env_consistency_check ) { if ( pr->ordered_bumped ) { struct cons_header *p = __kmp_threads[ gtid ]->th.th_cons; __kmp_error_construct2( kmp_i18n_msg_CnsMultipleNesting, ct_ordered_in_pdo, loc_ref, & p->stack_data[ p->w_top ] ); } } #endif /* !defined(KMP_GOMP_COMPAT) */ KMP_MB(); #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_deo: T#%%d before wait: ordered_iter:%%%s lower:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, lower ) ); __kmp_str_free( &buff ); } #endif __kmp_wait_yield< UT >( &sh->u.s.ordered_iteration, lower, __kmp_ge< UT > USE_ITT_BUILD_ARG( NULL ) ); KMP_MB(); /* is this necessary? */ #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_deo: T#%%d after wait: ordered_iter:%%%s lower:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, lower ) ); __kmp_str_free( &buff ); } #endif } KD_TRACE(100, ("__kmp_dispatch_deo: T#%d returned\n", gtid ) ); } static void __kmp_dispatch_dxo_error( int *gtid_ref, int *cid_ref, ident_t *loc_ref ) { kmp_info_t *th; if ( __kmp_env_consistency_check ) { th = __kmp_threads[*gtid_ref]; if ( th -> th.th_dispatch -> th_dispatch_pr_current -> pushed_ws != ct_none ) { __kmp_pop_sync( *gtid_ref, ct_ordered_in_pdo, loc_ref ); } } } template< typename UT > static void __kmp_dispatch_dxo( int *gtid_ref, int *cid_ref, ident_t *loc_ref ) { typedef typename traits_t< UT >::signed_t ST; dispatch_private_info_template< UT > * pr; int gtid = *gtid_ref; // int cid = *cid_ref; kmp_info_t *th = __kmp_threads[ gtid ]; KMP_DEBUG_ASSERT( th -> th.th_dispatch ); KD_TRACE(100, ("__kmp_dispatch_dxo: T#%d called\n", gtid ) ); if ( __kmp_env_consistency_check ) { pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_pr_current ); if ( pr -> pushed_ws != ct_none ) { __kmp_pop_sync( gtid, ct_ordered_in_pdo, loc_ref ); } } if ( ! th -> th.th_team -> t.t_serialized ) { dispatch_shared_info_template< UT > * sh = reinterpret_cast< dispatch_shared_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_sh_current ); if ( ! __kmp_env_consistency_check ) { pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th -> th.th_dispatch -> th_dispatch_pr_current ); } KMP_FSYNC_RELEASING( & sh->u.s.ordered_iteration ); #if ! defined( KMP_GOMP_COMPAT ) if ( __kmp_env_consistency_check ) { if ( pr->ordered_bumped != 0 ) { struct cons_header *p = __kmp_threads[ gtid ]->th.th_cons; /* How to test it? - OM */ __kmp_error_construct2( kmp_i18n_msg_CnsMultipleNesting, ct_ordered_in_pdo, loc_ref, & p->stack_data[ p->w_top ] ); } } #endif /* !defined(KMP_GOMP_COMPAT) */ KMP_MB(); /* Flush all pending memory write invalidates. */ pr->ordered_bumped += 1; KD_TRACE(1000, ("__kmp_dispatch_dxo: T#%d bumping ordered ordered_bumped=%d\n", gtid, pr->ordered_bumped ) ); KMP_MB(); /* Flush all pending memory write invalidates. */ /* TODO use general release procedure? */ test_then_inc< ST >( (volatile ST *) & sh->u.s.ordered_iteration ); KMP_MB(); /* Flush all pending memory write invalidates. */ } KD_TRACE(100, ("__kmp_dispatch_dxo: T#%d returned\n", gtid ) ); } /* Computes and returns x to the power of y, where y must a non-negative integer */ template< typename UT > static __forceinline long double __kmp_pow(long double x, UT y) { long double s=1.0L; KMP_DEBUG_ASSERT(x > 0.0 && x < 1.0); //KMP_DEBUG_ASSERT(y >= 0); // y is unsigned while(y) { if ( y & 1 ) s *= x; x *= x; y >>= 1; } return s; } /* Computes and returns the number of unassigned iterations after idx chunks have been assigned (the total number of unassigned iterations in chunks with index greater than or equal to idx). __forceinline seems to be broken so that if we __forceinline this function, the behavior is wrong (one of the unit tests, sch_guided_analytical_basic.cpp, fails) */ template< typename T > static __inline typename traits_t< T >::unsigned_t __kmp_dispatch_guided_remaining( T tc, typename traits_t< T >::floating_t base, typename traits_t< T >::unsigned_t idx ) { /* Note: On Windows* OS on IA-32 architecture and Intel(R) 64, at least for ICL 8.1, long double arithmetic may not really have long double precision, even with /Qlong_double. Currently, we workaround that in the caller code, by manipulating the FPCW for Windows* OS on IA-32 architecture. The lack of precision is not expected to be a correctness issue, though. */ typedef typename traits_t< T >::unsigned_t UT; long double x = tc * __kmp_pow< UT >(base, idx); UT r = (UT) x; if ( x == r ) return r; return r + 1; } // Parameters of the guided-iterative algorithm: // p2 = n * nproc * ( chunk + 1 ) // point of switching to dynamic // p3 = 1 / ( n * nproc ) // remaining iterations multiplier // by default n = 2. For example with n = 3 the chunks distribution will be more flat. // With n = 1 first chunk is the same as for static schedule, e.g. trip / nproc. static int guided_int_param = 2; static double guided_flt_param = 0.5;// = 1.0 / guided_int_param; // UT - unsigned flavor of T, ST - signed flavor of T, // DBL - double if sizeof(T)==4, or long double if sizeof(T)==8 template< typename T > static void __kmp_dispatch_init( ident_t * loc, int gtid, enum sched_type schedule, T lb, T ub, typename traits_t< T >::signed_t st, typename traits_t< T >::signed_t chunk, int push_ws ) { typedef typename traits_t< T >::unsigned_t UT; typedef typename traits_t< T >::signed_t ST; typedef typename traits_t< T >::floating_t DBL; int active; T tc; kmp_info_t * th; kmp_team_t * team; kmp_uint32 my_buffer_index; dispatch_private_info_template< T > * pr; dispatch_shared_info_template< UT > volatile * sh; KMP_BUILD_ASSERT( sizeof( dispatch_private_info_template< T > ) == sizeof( dispatch_private_info ) ); KMP_BUILD_ASSERT( sizeof( dispatch_shared_info_template< UT > ) == sizeof( dispatch_shared_info ) ); if ( ! TCR_4( __kmp_init_parallel ) ) __kmp_parallel_initialize(); #if INCLUDE_SSC_MARKS SSC_MARK_DISPATCH_INIT(); #endif #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_init: T#%%d called: schedule:%%d chunk:%%%s lb:%%%s ub:%%%s st:%%%s\n", traits_t< ST >::spec, traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec ); KD_TRACE(10, ( buff, gtid, schedule, chunk, lb, ub, st ) ); __kmp_str_free( &buff ); } #endif /* setup data */ th = __kmp_threads[ gtid ]; team = th -> th.th_team; active = ! team -> t.t_serialized; th->th.th_ident = loc; #if USE_ITT_BUILD kmp_uint64 cur_chunk = chunk; int itt_need_metadata_reporting = __itt_metadata_add_ptr && __kmp_forkjoin_frames_mode == 3 && KMP_MASTER_GTID(gtid) && #if OMP_40_ENABLED th->th.th_teams_microtask == NULL && #endif team->t.t_active_level == 1; #endif if ( ! active ) { pr = reinterpret_cast< dispatch_private_info_template< T >* > ( th -> th.th_dispatch -> th_disp_buffer ); /* top of the stack */ } else { KMP_DEBUG_ASSERT( th->th.th_dispatch == &th->th.th_team->t.t_dispatch[th->th.th_info.ds.ds_tid] ); my_buffer_index = th->th.th_dispatch->th_disp_index ++; /* What happens when number of threads changes, need to resize buffer? */ pr = reinterpret_cast< dispatch_private_info_template< T > * > ( &th -> th.th_dispatch -> th_disp_buffer[ my_buffer_index % __kmp_dispatch_num_buffers ] ); sh = reinterpret_cast< dispatch_shared_info_template< UT > volatile * > ( &team -> t.t_disp_buffer[ my_buffer_index % __kmp_dispatch_num_buffers ] ); } #if ( KMP_STATIC_STEAL_ENABLED ) if ( SCHEDULE_HAS_NONMONOTONIC(schedule) ) // AC: we now have only one implementation of stealing, so use it schedule = kmp_sch_static_steal; else #endif schedule = SCHEDULE_WITHOUT_MODIFIERS(schedule); /* Pick up the nomerge/ordered bits from the scheduling type */ if ( (schedule >= kmp_nm_lower) && (schedule < kmp_nm_upper) ) { pr->nomerge = TRUE; schedule = (enum sched_type)(((int)schedule) - (kmp_nm_lower - kmp_sch_lower)); } else { pr->nomerge = FALSE; } pr->type_size = traits_t::type_size; // remember the size of variables if ( kmp_ord_lower & schedule ) { pr->ordered = TRUE; schedule = (enum sched_type)(((int)schedule) - (kmp_ord_lower - kmp_sch_lower)); } else { pr->ordered = FALSE; } if ( schedule == kmp_sch_static ) { schedule = __kmp_static; } else { if ( schedule == kmp_sch_runtime ) { // Use the scheduling specified by OMP_SCHEDULE (or __kmp_sch_default if not specified) schedule = team -> t.t_sched.r_sched_type; // Detail the schedule if needed (global controls are differentiated appropriately) if ( schedule == kmp_sch_guided_chunked ) { schedule = __kmp_guided; } else if ( schedule == kmp_sch_static ) { schedule = __kmp_static; } // Use the chunk size specified by OMP_SCHEDULE (or default if not specified) chunk = team -> t.t_sched.chunk; #if USE_ITT_BUILD cur_chunk = chunk; #endif #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_init: T#%%d new: schedule:%%d chunk:%%%s\n", traits_t< ST >::spec ); KD_TRACE(10, ( buff, gtid, schedule, chunk ) ); __kmp_str_free( &buff ); } #endif } else { if ( schedule == kmp_sch_guided_chunked ) { schedule = __kmp_guided; } if ( chunk <= 0 ) { chunk = KMP_DEFAULT_CHUNK; } } if ( schedule == kmp_sch_auto ) { // mapping and differentiation: in the __kmp_do_serial_initialize() schedule = __kmp_auto; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_init: kmp_sch_auto: T#%%d new: schedule:%%d chunk:%%%s\n", traits_t< ST >::spec ); KD_TRACE(10, ( buff, gtid, schedule, chunk ) ); __kmp_str_free( &buff ); } #endif } /* guided analytical not safe for too many threads */ if ( schedule == kmp_sch_guided_analytical_chunked && th->th.th_team_nproc > 1<<20 ) { schedule = kmp_sch_guided_iterative_chunked; KMP_WARNING( DispatchManyThreads ); } pr->u.p.parm1 = chunk; } KMP_ASSERT2( (kmp_sch_lower < schedule && schedule < kmp_sch_upper), "unknown scheduling type" ); pr->u.p.count = 0; if ( __kmp_env_consistency_check ) { if ( st == 0 ) { __kmp_error_construct( kmp_i18n_msg_CnsLoopIncrZeroProhibited, ( pr->ordered ? ct_pdo_ordered : ct_pdo ), loc ); } } // compute trip count if ( st == 1 ) { // most common case if ( ub >= lb ) { tc = ub - lb + 1; } else { // ub < lb tc = 0; // zero-trip } } else if ( st < 0 ) { if ( lb >= ub ) { // AC: cast to unsigned is needed for loops like (i=2B; i>-2B; i-=1B), // where the division needs to be unsigned regardless of the result type tc = (UT)(lb - ub) / (-st) + 1; } else { // lb < ub tc = 0; // zero-trip } } else { // st > 0 if ( ub >= lb ) { // AC: cast to unsigned is needed for loops like (i=-2B; i<2B; i+=1B), // where the division needs to be unsigned regardless of the result type tc = (UT)(ub - lb) / st + 1; } else { // ub < lb tc = 0; // zero-trip } } // Any half-decent optimizer will remove this test when the blocks are empty since the macros expand to nothing // when statistics are disabled. if (schedule == __kmp_static) { KMP_COUNT_BLOCK(OMP_FOR_static); KMP_COUNT_VALUE(FOR_static_iterations, tc); } else { KMP_COUNT_BLOCK(OMP_FOR_dynamic); KMP_COUNT_VALUE(FOR_dynamic_iterations, tc); } pr->u.p.lb = lb; pr->u.p.ub = ub; pr->u.p.st = st; pr->u.p.tc = tc; #if KMP_OS_WINDOWS pr->u.p.last_upper = ub + st; #endif /* KMP_OS_WINDOWS */ /* NOTE: only the active parallel region(s) has active ordered sections */ if ( active ) { if ( pr->ordered == 0 ) { th -> th.th_dispatch -> th_deo_fcn = __kmp_dispatch_deo_error; th -> th.th_dispatch -> th_dxo_fcn = __kmp_dispatch_dxo_error; } else { pr->ordered_bumped = 0; pr->u.p.ordered_lower = 1; pr->u.p.ordered_upper = 0; th -> th.th_dispatch -> th_deo_fcn = __kmp_dispatch_deo< UT >; th -> th.th_dispatch -> th_dxo_fcn = __kmp_dispatch_dxo< UT >; } } if ( __kmp_env_consistency_check ) { enum cons_type ws = pr->ordered ? ct_pdo_ordered : ct_pdo; if ( push_ws ) { __kmp_push_workshare( gtid, ws, loc ); pr->pushed_ws = ws; } else { __kmp_check_workshare( gtid, ws, loc ); pr->pushed_ws = ct_none; } } switch ( schedule ) { #if ( KMP_STATIC_STEAL_ENABLED ) case kmp_sch_static_steal: { T nproc = th->th.th_team_nproc; T ntc, init; KD_TRACE(100, ("__kmp_dispatch_init: T#%d kmp_sch_static_steal case\n", gtid ) ); ntc = (tc % chunk ? 1 : 0) + tc / chunk; if ( nproc > 1 && ntc >= nproc ) { KMP_COUNT_BLOCK(OMP_FOR_static_steal); T id = __kmp_tid_from_gtid(gtid); T small_chunk, extras; small_chunk = ntc / nproc; extras = ntc % nproc; init = id * small_chunk + ( id < extras ? id : extras ); pr->u.p.count = init; pr->u.p.ub = init + small_chunk + ( id < extras ? 1 : 0 ); pr->u.p.parm2 = lb; //pr->pfields.parm3 = 0; // it's not used in static_steal pr->u.p.parm4 = (id + 1) % nproc; // remember neighbour tid pr->u.p.st = st; if ( traits_t::type_size > 4 ) { // AC: TODO: check if 16-byte CAS available and use it to // improve performance (probably wait for explicit request // before spending time on this). // For now use dynamically allocated per-thread lock, // free memory in __kmp_dispatch_next when status==0. KMP_DEBUG_ASSERT(th->th.th_dispatch->th_steal_lock == NULL); th->th.th_dispatch->th_steal_lock = (kmp_lock_t*)__kmp_allocate(sizeof(kmp_lock_t)); __kmp_init_lock(th->th.th_dispatch->th_steal_lock); } break; } else { KD_TRACE(100, ("__kmp_dispatch_init: T#%d falling-through to kmp_sch_static_balanced\n", gtid ) ); schedule = kmp_sch_static_balanced; /* too few iterations: fall-through to kmp_sch_static_balanced */ } // if /* FALL-THROUGH to static balanced */ } // case #endif case kmp_sch_static_balanced: { T nproc = th->th.th_team_nproc; T init, limit; KD_TRACE(100, ("__kmp_dispatch_init: T#%d kmp_sch_static_balanced case\n", gtid ) ); if ( nproc > 1 ) { T id = __kmp_tid_from_gtid(gtid); if ( tc < nproc ) { if ( id < tc ) { init = id; limit = id; pr->u.p.parm1 = (id == tc - 1); /* parm1 stores *plastiter */ } else { pr->u.p.count = 1; /* means no more chunks to execute */ pr->u.p.parm1 = FALSE; break; } } else { T small_chunk = tc / nproc; T extras = tc % nproc; init = id * small_chunk + (id < extras ? id : extras); limit = init + small_chunk - (id < extras ? 0 : 1); pr->u.p.parm1 = (id == nproc - 1); } } else { if ( tc > 0 ) { init = 0; limit = tc - 1; pr->u.p.parm1 = TRUE; } else { // zero trip count pr->u.p.count = 1; /* means no more chunks to execute */ pr->u.p.parm1 = FALSE; break; } } #if USE_ITT_BUILD // Calculate chunk for metadata report if ( itt_need_metadata_reporting ) cur_chunk = limit - init + 1; #endif if ( st == 1 ) { pr->u.p.lb = lb + init; pr->u.p.ub = lb + limit; } else { T ub_tmp = lb + limit * st; // calculated upper bound, "ub" is user-defined upper bound pr->u.p.lb = lb + init * st; // adjust upper bound to "ub" if needed, so that MS lastprivate will match it exactly if ( st > 0 ) { pr->u.p.ub = ( ub_tmp + st > ub ? ub : ub_tmp ); } else { pr->u.p.ub = ( ub_tmp + st < ub ? ub : ub_tmp ); } } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; } break; } // case case kmp_sch_guided_iterative_chunked : { T nproc = th->th.th_team_nproc; KD_TRACE(100,("__kmp_dispatch_init: T#%d kmp_sch_guided_iterative_chunked case\n",gtid)); if ( nproc > 1 ) { if ( (2L * chunk + 1 ) * nproc >= tc ) { /* chunk size too large, switch to dynamic */ schedule = kmp_sch_dynamic_chunked; } else { // when remaining iters become less than parm2 - switch to dynamic pr->u.p.parm2 = guided_int_param * nproc * ( chunk + 1 ); *(double*)&pr->u.p.parm3 = guided_flt_param / nproc; // may occupy parm3 and parm4 } } else { KD_TRACE(100,("__kmp_dispatch_init: T#%d falling-through to kmp_sch_static_greedy\n",gtid)); schedule = kmp_sch_static_greedy; /* team->t.t_nproc == 1: fall-through to kmp_sch_static_greedy */ KD_TRACE(100,("__kmp_dispatch_init: T#%d kmp_sch_static_greedy case\n",gtid)); pr->u.p.parm1 = tc; } // if } // case break; case kmp_sch_guided_analytical_chunked: { T nproc = th->th.th_team_nproc; KD_TRACE(100, ("__kmp_dispatch_init: T#%d kmp_sch_guided_analytical_chunked case\n", gtid)); if ( nproc > 1 ) { if ( (2L * chunk + 1 ) * nproc >= tc ) { /* chunk size too large, switch to dynamic */ schedule = kmp_sch_dynamic_chunked; } else { /* commonly used term: (2 nproc - 1)/(2 nproc) */ DBL x; #if KMP_OS_WINDOWS && KMP_ARCH_X86 /* Linux* OS already has 64-bit computation by default for long double, and on Windows* OS on Intel(R) 64, /Qlong_double doesn't work. On Windows* OS on IA-32 architecture, we need to set precision to 64-bit instead of the default 53-bit. Even though long double doesn't work on Windows* OS on Intel(R) 64, the resulting lack of precision is not expected to impact the correctness of the algorithm, but this has not been mathematically proven. */ // save original FPCW and set precision to 64-bit, as // Windows* OS on IA-32 architecture defaults to 53-bit unsigned int oldFpcw = _control87(0,0); _control87(_PC_64,_MCW_PC); // 0,0x30000 #endif /* value used for comparison in solver for cross-over point */ long double target = ((long double)chunk * 2 + 1) * nproc / tc; /* crossover point--chunk indexes equal to or greater than this point switch to dynamic-style scheduling */ UT cross; /* commonly used term: (2 nproc - 1)/(2 nproc) */ x = (long double)1.0 - (long double)0.5 / nproc; #ifdef KMP_DEBUG { // test natural alignment struct _test_a { char a; union { char b; DBL d; }; } t; ptrdiff_t natural_alignment = (ptrdiff_t)&t.b - (ptrdiff_t)&t - (ptrdiff_t)1; //__kmp_warn( " %llx %llx %lld", (long long)&t.d, (long long)&t, (long long)natural_alignment ); KMP_DEBUG_ASSERT( ( ( (ptrdiff_t)&pr->u.p.parm3 ) & ( natural_alignment ) ) == 0 ); } #endif // KMP_DEBUG /* save the term in thread private dispatch structure */ *(DBL*)&pr->u.p.parm3 = x; /* solve for the crossover point to the nearest integer i for which C_i <= chunk */ { UT left, right, mid; long double p; /* estimate initial upper and lower bound */ /* doesn't matter what value right is as long as it is positive, but it affects performance of the solver */ right = 229; p = __kmp_pow< UT >(x,right); if ( p > target ) { do{ p *= p; right <<= 1; } while(p>target && right < (1<<27)); left = right >> 1; /* lower bound is previous (failed) estimate of upper bound */ } else { left = 0; } /* bisection root-finding method */ while ( left + 1 < right ) { mid = (left + right) / 2; if ( __kmp_pow< UT >(x,mid) > target ) { left = mid; } else { right = mid; } } // while cross = right; } /* assert sanity of computed crossover point */ KMP_ASSERT(cross && __kmp_pow< UT >(x, cross - 1) > target && __kmp_pow< UT >(x, cross) <= target); /* save the crossover point in thread private dispatch structure */ pr->u.p.parm2 = cross; // C75803 #if ( ( KMP_OS_LINUX || KMP_OS_WINDOWS ) && KMP_ARCH_X86 ) && ( ! defined( KMP_I8 ) ) #define GUIDED_ANALYTICAL_WORKAROUND (*( DBL * )&pr->u.p.parm3) #else #define GUIDED_ANALYTICAL_WORKAROUND (x) #endif /* dynamic-style scheduling offset */ pr->u.p.count = tc - __kmp_dispatch_guided_remaining(tc, GUIDED_ANALYTICAL_WORKAROUND, cross) - cross * chunk; #if KMP_OS_WINDOWS && KMP_ARCH_X86 // restore FPCW _control87(oldFpcw,_MCW_PC); #endif } // if } else { KD_TRACE(100, ("__kmp_dispatch_init: T#%d falling-through to kmp_sch_static_greedy\n", gtid ) ); schedule = kmp_sch_static_greedy; /* team->t.t_nproc == 1: fall-through to kmp_sch_static_greedy */ pr->u.p.parm1 = tc; } // if } // case break; case kmp_sch_static_greedy: KD_TRACE(100,("__kmp_dispatch_init: T#%d kmp_sch_static_greedy case\n",gtid)); pr->u.p.parm1 = ( th->th.th_team_nproc > 1 ) ? ( tc + th->th.th_team_nproc - 1 ) / th->th.th_team_nproc : tc; break; case kmp_sch_static_chunked : case kmp_sch_dynamic_chunked : if ( pr->u.p.parm1 <= 0 ) { pr->u.p.parm1 = KMP_DEFAULT_CHUNK; } KD_TRACE(100,("__kmp_dispatch_init: T#%d kmp_sch_static_chunked/kmp_sch_dynamic_chunked cases\n", gtid)); break; case kmp_sch_trapezoidal : { /* TSS: trapezoid self-scheduling, minimum chunk_size = parm1 */ T parm1, parm2, parm3, parm4; KD_TRACE(100, ("__kmp_dispatch_init: T#%d kmp_sch_trapezoidal case\n", gtid ) ); parm1 = chunk; /* F : size of the first cycle */ parm2 = ( tc / (2 * th->th.th_team_nproc) ); if ( parm2 < 1 ) { parm2 = 1; } /* L : size of the last cycle. Make sure the last cycle * is not larger than the first cycle. */ if ( parm1 < 1 ) { parm1 = 1; } else if ( parm1 > parm2 ) { parm1 = parm2; } /* N : number of cycles */ parm3 = ( parm2 + parm1 ); parm3 = ( 2 * tc + parm3 - 1) / parm3; if ( parm3 < 2 ) { parm3 = 2; } /* sigma : decreasing incr of the trapezoid */ parm4 = ( parm3 - 1 ); parm4 = ( parm2 - parm1 ) / parm4; // pointless check, because parm4 >= 0 always //if ( parm4 < 0 ) { // parm4 = 0; //} pr->u.p.parm1 = parm1; pr->u.p.parm2 = parm2; pr->u.p.parm3 = parm3; pr->u.p.parm4 = parm4; } // case break; default: { __kmp_msg( kmp_ms_fatal, // Severity KMP_MSG( UnknownSchedTypeDetected ), // Primary message KMP_HNT( GetNewerLibrary ), // Hint __kmp_msg_null // Variadic argument list terminator ); } break; } // switch pr->schedule = schedule; if ( active ) { /* The name of this buffer should be my_buffer_index when it's free to use it */ KD_TRACE(100, ("__kmp_dispatch_init: T#%d before wait: my_buffer_index:%d sh->buffer_index:%d\n", gtid, my_buffer_index, sh->buffer_index) ); __kmp_wait_yield< kmp_uint32 >( & sh->buffer_index, my_buffer_index, __kmp_eq< kmp_uint32 > USE_ITT_BUILD_ARG( NULL ) ); // Note: KMP_WAIT_YIELD() cannot be used there: buffer index and my_buffer_index are // *always* 32-bit integers. KMP_MB(); /* is this necessary? */ KD_TRACE(100, ("__kmp_dispatch_init: T#%d after wait: my_buffer_index:%d sh->buffer_index:%d\n", gtid, my_buffer_index, sh->buffer_index) ); th -> th.th_dispatch -> th_dispatch_pr_current = (dispatch_private_info_t*) pr; th -> th.th_dispatch -> th_dispatch_sh_current = (dispatch_shared_info_t*) sh; #if USE_ITT_BUILD if ( pr->ordered ) { __kmp_itt_ordered_init( gtid ); }; // if // Report loop metadata if ( itt_need_metadata_reporting ) { // Only report metadata by master of active team at level 1 kmp_uint64 schedtype = 0; switch ( schedule ) { case kmp_sch_static_chunked: case kmp_sch_static_balanced:// Chunk is calculated in the switch above break; case kmp_sch_static_greedy: cur_chunk = pr->u.p.parm1; break; case kmp_sch_dynamic_chunked: schedtype = 1; break; case kmp_sch_guided_iterative_chunked: case kmp_sch_guided_analytical_chunked: schedtype = 2; break; default: // Should we put this case under "static"? // case kmp_sch_static_steal: schedtype = 3; break; } __kmp_itt_metadata_loop(loc, schedtype, tc, cur_chunk); } #endif /* USE_ITT_BUILD */ }; // if #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_init: T#%%d returning: schedule:%%d ordered:%%%s lb:%%%s ub:%%%s" \ " st:%%%s tc:%%%s count:%%%s\n\tordered_lower:%%%s ordered_upper:%%%s" \ " parm1:%%%s parm2:%%%s parm3:%%%s parm4:%%%s\n", traits_t< UT >::spec, traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec, traits_t< UT >::spec, traits_t< UT >::spec, traits_t< UT >::spec, traits_t< UT >::spec, traits_t< T >::spec, traits_t< T >::spec, traits_t< T >::spec, traits_t< T >::spec ); KD_TRACE(10, ( buff, gtid, pr->schedule, pr->ordered, pr->u.p.lb, pr->u.p.ub, pr->u.p.st, pr->u.p.tc, pr->u.p.count, pr->u.p.ordered_lower, pr->u.p.ordered_upper, pr->u.p.parm1, pr->u.p.parm2, pr->u.p.parm3, pr->u.p.parm4 ) ); __kmp_str_free( &buff ); } #endif #if ( KMP_STATIC_STEAL_ENABLED ) // It cannot be guaranteed that after execution of a loop with some other schedule kind // all the parm3 variables will contain the same value. // Even if all parm3 will be the same, it still exists a bad case like using 0 and 1 // rather than program life-time increment. // So the dedicated variable is required. The 'static_steal_counter' is used. if( schedule == kmp_sch_static_steal ) { // Other threads will inspect this variable when searching for a victim. // This is a flag showing that other threads may steal from this thread since then. volatile T * p = &pr->u.p.static_steal_counter; *p = *p + 1; } #endif // ( KMP_STATIC_STEAL_ENABLED ) #if OMPT_SUPPORT && OMPT_TRACE if (ompt_enabled && ompt_callbacks.ompt_callback(ompt_event_loop_begin)) { ompt_team_info_t *team_info = __ompt_get_teaminfo(0, NULL); ompt_task_info_t *task_info = __ompt_get_taskinfo(0); ompt_callbacks.ompt_callback(ompt_event_loop_begin)( team_info->parallel_id, task_info->task_id, team_info->microtask); } #endif } /* * For ordered loops, either __kmp_dispatch_finish() should be called after * every iteration, or __kmp_dispatch_finish_chunk() should be called after * every chunk of iterations. If the ordered section(s) were not executed * for this iteration (or every iteration in this chunk), we need to set the * ordered iteration counters so that the next thread can proceed. */ template< typename UT > static void __kmp_dispatch_finish( int gtid, ident_t *loc ) { typedef typename traits_t< UT >::signed_t ST; kmp_info_t *th = __kmp_threads[ gtid ]; KD_TRACE(100, ("__kmp_dispatch_finish: T#%d called\n", gtid ) ); if ( ! th -> th.th_team -> t.t_serialized ) { dispatch_private_info_template< UT > * pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th->th.th_dispatch->th_dispatch_pr_current ); dispatch_shared_info_template< UT > volatile * sh = reinterpret_cast< dispatch_shared_info_template< UT >volatile* > ( th->th.th_dispatch->th_dispatch_sh_current ); KMP_DEBUG_ASSERT( pr ); KMP_DEBUG_ASSERT( sh ); KMP_DEBUG_ASSERT( th->th.th_dispatch == &th->th.th_team->t.t_dispatch[th->th.th_info.ds.ds_tid] ); if ( pr->ordered_bumped ) { KD_TRACE(1000, ("__kmp_dispatch_finish: T#%d resetting ordered_bumped to zero\n", gtid ) ); pr->ordered_bumped = 0; } else { UT lower = pr->u.p.ordered_lower; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_finish: T#%%d before wait: ordered_iteration:%%%s lower:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, lower ) ); __kmp_str_free( &buff ); } #endif __kmp_wait_yield< UT >(&sh->u.s.ordered_iteration, lower, __kmp_ge< UT > USE_ITT_BUILD_ARG(NULL) ); KMP_MB(); /* is this necessary? */ #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_finish: T#%%d after wait: ordered_iteration:%%%s lower:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, lower ) ); __kmp_str_free( &buff ); } #endif test_then_inc< ST >( (volatile ST *) & sh->u.s.ordered_iteration ); } // if } // if KD_TRACE(100, ("__kmp_dispatch_finish: T#%d returned\n", gtid ) ); } #ifdef KMP_GOMP_COMPAT template< typename UT > static void __kmp_dispatch_finish_chunk( int gtid, ident_t *loc ) { typedef typename traits_t< UT >::signed_t ST; kmp_info_t *th = __kmp_threads[ gtid ]; KD_TRACE(100, ("__kmp_dispatch_finish_chunk: T#%d called\n", gtid ) ); if ( ! th -> th.th_team -> t.t_serialized ) { // int cid; dispatch_private_info_template< UT > * pr = reinterpret_cast< dispatch_private_info_template< UT >* > ( th->th.th_dispatch->th_dispatch_pr_current ); dispatch_shared_info_template< UT > volatile * sh = reinterpret_cast< dispatch_shared_info_template< UT >volatile* > ( th->th.th_dispatch->th_dispatch_sh_current ); KMP_DEBUG_ASSERT( pr ); KMP_DEBUG_ASSERT( sh ); KMP_DEBUG_ASSERT( th->th.th_dispatch == &th->th.th_team->t.t_dispatch[th->th.th_info.ds.ds_tid] ); // for (cid = 0; cid < KMP_MAX_ORDERED; ++cid) { UT lower = pr->u.p.ordered_lower; UT upper = pr->u.p.ordered_upper; UT inc = upper - lower + 1; if ( pr->ordered_bumped == inc ) { KD_TRACE(1000, ("__kmp_dispatch_finish: T#%d resetting ordered_bumped to zero\n", gtid ) ); pr->ordered_bumped = 0; } else { inc -= pr->ordered_bumped; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_finish_chunk: T#%%d before wait: " \ "ordered_iteration:%%%s lower:%%%s upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, lower, upper ) ); __kmp_str_free( &buff ); } #endif __kmp_wait_yield< UT >(&sh->u.s.ordered_iteration, lower, __kmp_ge< UT > USE_ITT_BUILD_ARG(NULL) ); KMP_MB(); /* is this necessary? */ KD_TRACE(1000, ("__kmp_dispatch_finish_chunk: T#%d resetting ordered_bumped to zero\n", gtid ) ); pr->ordered_bumped = 0; //!!!!! TODO check if the inc should be unsigned, or signed??? #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_finish_chunk: T#%%d after wait: " \ "ordered_iteration:%%%s inc:%%%s lower:%%%s upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec, traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, sh->u.s.ordered_iteration, inc, lower, upper ) ); __kmp_str_free( &buff ); } #endif test_then_add< ST >( (volatile ST *) & sh->u.s.ordered_iteration, inc); } // } } KD_TRACE(100, ("__kmp_dispatch_finish_chunk: T#%d returned\n", gtid ) ); } #endif /* KMP_GOMP_COMPAT */ /* Define a macro for exiting __kmp_dispatch_next(). If status is 0 * (no more work), then tell OMPT the loop is over. In some cases * kmp_dispatch_fini() is not called. */ #if OMPT_SUPPORT && OMPT_TRACE #define OMPT_LOOP_END \ if (status == 0) { \ if (ompt_enabled && \ ompt_callbacks.ompt_callback(ompt_event_loop_end)) { \ ompt_team_info_t *team_info = __ompt_get_teaminfo(0, NULL); \ ompt_task_info_t *task_info = __ompt_get_taskinfo(0); \ ompt_callbacks.ompt_callback(ompt_event_loop_end)( \ team_info->parallel_id, task_info->task_id); \ } \ } #else #define OMPT_LOOP_END // no-op #endif template< typename T > static int __kmp_dispatch_next( ident_t *loc, int gtid, kmp_int32 *p_last, T *p_lb, T *p_ub, typename traits_t< T >::signed_t *p_st ) { typedef typename traits_t< T >::unsigned_t UT; typedef typename traits_t< T >::signed_t ST; typedef typename traits_t< T >::floating_t DBL; // This is potentially slightly misleading, schedule(runtime) will appear here even if the actual runtme schedule // is static. (Which points out a disadavantage of schedule(runtime): even when static scheduling is used it costs // more than a compile time choice to use static scheduling would.) KMP_TIME_PARTITIONED_BLOCK(FOR_dynamic_scheduling); int status; dispatch_private_info_template< T > * pr; kmp_info_t * th = __kmp_threads[ gtid ]; kmp_team_t * team = th -> th.th_team; KMP_DEBUG_ASSERT( p_lb && p_ub && p_st ); // AC: these cannot be NULL #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d called p_lb:%%%s p_ub:%%%s p_st:%%%s p_last: %%p\n", traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec ); KD_TRACE(1000, ( buff, gtid, *p_lb, *p_ub, p_st ? *p_st : 0, p_last ) ); __kmp_str_free( &buff ); } #endif if ( team -> t.t_serialized ) { /* NOTE: serialize this dispatch becase we are not at the active level */ pr = reinterpret_cast< dispatch_private_info_template< T >* > ( th -> th.th_dispatch -> th_disp_buffer ); /* top of the stack */ KMP_DEBUG_ASSERT( pr ); if ( (status = (pr->u.p.tc != 0)) == 0 ) { *p_lb = 0; *p_ub = 0; // if ( p_last != NULL ) // *p_last = 0; if ( p_st != NULL ) *p_st = 0; if ( __kmp_env_consistency_check ) { if ( pr->pushed_ws != ct_none ) { pr->pushed_ws = __kmp_pop_workshare( gtid, pr->pushed_ws, loc ); } } } else if ( pr->nomerge ) { kmp_int32 last; T start; UT limit, trip, init; ST incr; T chunk = pr->u.p.parm1; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_dynamic_chunked case\n", gtid ) ); init = chunk * pr->u.p.count++; trip = pr->u.p.tc - 1; if ( (status = (init <= trip)) == 0 ) { *p_lb = 0; *p_ub = 0; // if ( p_last != NULL ) // *p_last = 0; if ( p_st != NULL ) *p_st = 0; if ( __kmp_env_consistency_check ) { if ( pr->pushed_ws != ct_none ) { pr->pushed_ws = __kmp_pop_workshare( gtid, pr->pushed_ws, loc ); } } } else { start = pr->u.p.lb; limit = chunk + init - 1; incr = pr->u.p.st; if ( (last = (limit >= trip)) != 0 ) { limit = trip; #if KMP_OS_WINDOWS pr->u.p.last_upper = pr->u.p.ub; #endif /* KMP_OS_WINDOWS */ } if ( p_last != NULL ) *p_last = last; if ( p_st != NULL ) *p_st = incr; if ( incr == 1 ) { *p_lb = start + init; *p_ub = start + limit; } else { *p_lb = start + init * incr; *p_ub = start + limit * incr; } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // if } else { pr->u.p.tc = 0; *p_lb = pr->u.p.lb; *p_ub = pr->u.p.ub; #if KMP_OS_WINDOWS pr->u.p.last_upper = *p_ub; #endif /* KMP_OS_WINDOWS */ if ( p_last != NULL ) *p_last = TRUE; if ( p_st != NULL ) *p_st = pr->u.p.st; } // if #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d serialized case: p_lb:%%%s " \ "p_ub:%%%s p_st:%%%s p_last:%%p %%d returning:%%d\n", traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec ); KD_TRACE(10, ( buff, gtid, *p_lb, *p_ub, *p_st, p_last, *p_last, status) ); __kmp_str_free( &buff ); } #endif #if INCLUDE_SSC_MARKS SSC_MARK_DISPATCH_NEXT(); #endif OMPT_LOOP_END; return status; } else { kmp_int32 last = 0; dispatch_shared_info_template< UT > *sh; T start; ST incr; UT limit, trip, init; KMP_DEBUG_ASSERT( th->th.th_dispatch == &th->th.th_team->t.t_dispatch[th->th.th_info.ds.ds_tid] ); pr = reinterpret_cast< dispatch_private_info_template< T >* > ( th->th.th_dispatch->th_dispatch_pr_current ); KMP_DEBUG_ASSERT( pr ); sh = reinterpret_cast< dispatch_shared_info_template< UT >* > ( th->th.th_dispatch->th_dispatch_sh_current ); KMP_DEBUG_ASSERT( sh ); if ( pr->u.p.tc == 0 ) { // zero trip count status = 0; } else { switch (pr->schedule) { #if ( KMP_STATIC_STEAL_ENABLED ) case kmp_sch_static_steal: { T chunk = pr->u.p.parm1; int nproc = th->th.th_team_nproc; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_static_steal case\n", gtid) ); trip = pr->u.p.tc - 1; if ( traits_t::type_size > 4 ) { // use lock for 8-byte and CAS for 4-byte induction // variable. TODO (optional): check and use 16-byte CAS kmp_lock_t * lck = th->th.th_dispatch->th_steal_lock; KMP_DEBUG_ASSERT(lck != NULL); if( pr->u.p.count < (UT)pr->u.p.ub ) { __kmp_acquire_lock(lck, gtid); // try to get own chunk of iterations init = ( pr->u.p.count )++; status = ( init < (UT)pr->u.p.ub ); __kmp_release_lock(lck, gtid); } else { status = 0; // no own chunks } if( !status ) { // try to steal kmp_info_t **other_threads = team->t.t_threads; int while_limit = nproc; // nproc attempts to find a victim int while_index = 0; // TODO: algorithm of searching for a victim // should be cleaned up and measured while ( ( !status ) && ( while_limit != ++while_index ) ) { T remaining; T victimIdx = pr->u.p.parm4; T oldVictimIdx = victimIdx ? victimIdx - 1 : nproc - 1; dispatch_private_info_template< T > * victim = reinterpret_cast< dispatch_private_info_template< T >* > (other_threads[victimIdx]->th.th_dispatch->th_dispatch_pr_current); while( ( victim == NULL || victim == pr || ( *(volatile T*)&victim->u.p.static_steal_counter != *(volatile T*)&pr->u.p.static_steal_counter ) ) && oldVictimIdx != victimIdx ) { victimIdx = (victimIdx + 1) % nproc; victim = reinterpret_cast< dispatch_private_info_template< T >* > (other_threads[victimIdx]->th.th_dispatch->th_dispatch_pr_current); }; if( !victim || ( *(volatile T *)&victim->u.p.static_steal_counter != *(volatile T *)&pr->u.p.static_steal_counter ) ) { continue; // try once more (nproc attempts in total) // no victim is ready yet to participate in stealing // because all victims are still in kmp_init_dispatch } if( victim->u.p.count + 2 > (UT)victim->u.p.ub ) { pr->u.p.parm4 = (victimIdx + 1) % nproc; // shift start tid continue; // not enough chunks to steal, goto next victim } lck = other_threads[victimIdx]->th.th_dispatch->th_steal_lock; KMP_ASSERT(lck != NULL); __kmp_acquire_lock(lck, gtid); limit = victim->u.p.ub; // keep initial ub if( victim->u.p.count >= limit || (remaining = limit - victim->u.p.count) < 2 ) { __kmp_release_lock(lck, gtid); pr->u.p.parm4 = (victimIdx + 1) % nproc; // next victim continue; // not enough chunks to steal } // stealing succeded, reduce victim's ub by 1/4 of undone chunks or by 1 if( remaining > 3 ) { KMP_COUNT_VALUE(FOR_static_steal_stolen, remaining>>2); init = ( victim->u.p.ub -= (remaining>>2) ); // steal 1/4 of remaining } else { KMP_COUNT_VALUE(FOR_static_steal_stolen, 1); init = ( victim->u.p.ub -= 1 ); // steal 1 chunk of 2 or 3 remaining } __kmp_release_lock(lck, gtid); KMP_DEBUG_ASSERT(init + 1 <= limit); pr->u.p.parm4 = victimIdx; // remember victim to steal from status = 1; while_index = 0; // now update own count and ub with stolen range but init chunk __kmp_acquire_lock(th->th.th_dispatch->th_steal_lock, gtid); pr->u.p.count = init + 1; pr->u.p.ub = limit; __kmp_release_lock(th->th.th_dispatch->th_steal_lock, gtid); } // while (search for victim) } // if (try to find victim and steal) } else { // 4-byte induction variable, use 8-byte CAS for pair (count, ub) typedef union { struct { UT count; T ub; } p; kmp_int64 b; } union_i4; // All operations on 'count' or 'ub' must be combined atomically together. { union_i4 vold, vnew; vold.b = *( volatile kmp_int64 * )(&pr->u.p.count); vnew = vold; vnew.p.count++; while( ! KMP_COMPARE_AND_STORE_ACQ64( ( volatile kmp_int64* )&pr->u.p.count, *VOLATILE_CAST(kmp_int64 *)&vold.b, *VOLATILE_CAST(kmp_int64 *)&vnew.b ) ) { KMP_CPU_PAUSE(); vold.b = *( volatile kmp_int64 * )(&pr->u.p.count); vnew = vold; vnew.p.count++; } vnew = vold; init = vnew.p.count; status = ( init < (UT)vnew.p.ub ) ; } if( !status ) { kmp_info_t **other_threads = team->t.t_threads; int while_limit = nproc; // nproc attempts to find a victim int while_index = 0; // TODO: algorithm of searching for a victim // should be cleaned up and measured while ( ( !status ) && ( while_limit != ++while_index ) ) { union_i4 vold, vnew; kmp_int32 remaining; T victimIdx = pr->u.p.parm4; T oldVictimIdx = victimIdx ? victimIdx - 1 : nproc - 1; dispatch_private_info_template< T > * victim = reinterpret_cast< dispatch_private_info_template< T >* > (other_threads[victimIdx]->th.th_dispatch->th_dispatch_pr_current); while( (victim == NULL || victim == pr || (*(volatile T*)&victim->u.p.static_steal_counter != *(volatile T*)&pr->u.p.static_steal_counter)) && oldVictimIdx != victimIdx ) { victimIdx = (victimIdx + 1) % nproc; victim = reinterpret_cast< dispatch_private_info_template< T >* > ( other_threads[victimIdx]->th.th_dispatch->th_dispatch_pr_current ); }; if( !victim || ( *(volatile T *)&victim->u.p.static_steal_counter != *(volatile T *)&pr->u.p.static_steal_counter ) ) { continue; // try once more (nproc attempts in total) // no victim is ready yet to participate in stealing // because all victims are still in kmp_init_dispatch } pr->u.p.parm4 = victimIdx; // new victim found while( 1 ) { // CAS loop if victim has enough chunks to steal vold.b = *( volatile kmp_int64 * )( &victim->u.p.count ); vnew = vold; KMP_DEBUG_ASSERT( (vnew.p.ub - 1) * (UT)chunk <= trip ); if ( vnew.p.count >= (UT)vnew.p.ub || (remaining = vnew.p.ub - vnew.p.count) < 2 ) { pr->u.p.parm4 = (victimIdx + 1) % nproc; // shift start victim id break; // not enough chunks to steal, goto next victim } if( remaining > 3 ) { vnew.p.ub -= (remaining>>2); // try to steal 1/4 of remaining } else { vnew.p.ub -= 1; // steal 1 chunk of 2 or 3 remaining } KMP_DEBUG_ASSERT((vnew.p.ub - 1) * (UT)chunk <= trip); // TODO: Should this be acquire or release? if ( KMP_COMPARE_AND_STORE_ACQ64( ( volatile kmp_int64 * )&victim->u.p.count, *VOLATILE_CAST(kmp_int64 *)&vold.b, *VOLATILE_CAST(kmp_int64 *)&vnew.b ) ) { // stealing succedded KMP_COUNT_VALUE(FOR_static_steal_stolen, vold.p.ub-vnew.p.ub); status = 1; while_index = 0; // now update own count and ub init = vnew.p.ub; vold.p.count = init + 1; #if KMP_ARCH_X86 KMP_XCHG_FIXED64(( volatile kmp_int64 * )(&pr->u.p.count), vold.b); #else *( volatile kmp_int64 * )(&pr->u.p.count) = vold.b; #endif break; } // if (check CAS result) KMP_CPU_PAUSE(); // CAS failed, repeate attempt } // while (try to steal from particular victim) } // while (search for victim) } // if (try to find victim and steal) } // if (4-byte induction variable) if ( !status ) { *p_lb = 0; *p_ub = 0; if ( p_st != NULL ) *p_st = 0; } else { start = pr->u.p.parm2; init *= chunk; limit = chunk + init - 1; incr = pr->u.p.st; KMP_COUNT_VALUE(FOR_static_steal_chunks, 1); KMP_DEBUG_ASSERT(init <= trip); if ( (last = (limit >= trip)) != 0 ) limit = trip; if ( p_st != NULL ) *p_st = incr; if ( incr == 1 ) { *p_lb = start + init; *p_ub = start + limit; } else { *p_lb = start + init * incr; *p_ub = start + limit * incr; } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // if break; } // case #endif // ( KMP_STATIC_STEAL_ENABLED ) case kmp_sch_static_balanced: { KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_static_balanced case\n", gtid) ); if ( (status = !pr->u.p.count) != 0 ) { /* check if thread has any iteration to do */ pr->u.p.count = 1; *p_lb = pr->u.p.lb; *p_ub = pr->u.p.ub; last = pr->u.p.parm1; if ( p_st != NULL ) *p_st = pr->u.p.st; } else { /* no iterations to do */ pr->u.p.lb = pr->u.p.ub + pr->u.p.st; } if ( pr->ordered ) { #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // case break; case kmp_sch_static_greedy: /* original code for kmp_sch_static_greedy was merged here */ case kmp_sch_static_chunked: { T parm1; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_static_[affinity|chunked] case\n", gtid ) ); parm1 = pr->u.p.parm1; trip = pr->u.p.tc - 1; init = parm1 * (pr->u.p.count + __kmp_tid_from_gtid(gtid)); if ( (status = (init <= trip)) != 0 ) { start = pr->u.p.lb; incr = pr->u.p.st; limit = parm1 + init - 1; if ( (last = (limit >= trip)) != 0 ) limit = trip; if ( p_st != NULL ) *p_st = incr; pr->u.p.count += th->th.th_team_nproc; if ( incr == 1 ) { *p_lb = start + init; *p_ub = start + limit; } else { *p_lb = start + init * incr; *p_ub = start + limit * incr; } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // if } // case break; case kmp_sch_dynamic_chunked: { T chunk = pr->u.p.parm1; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_dynamic_chunked case\n", gtid ) ); init = chunk * test_then_inc_acq< ST >((volatile ST *) & sh->u.s.iteration ); trip = pr->u.p.tc - 1; if ( (status = (init <= trip)) == 0 ) { *p_lb = 0; *p_ub = 0; if ( p_st != NULL ) *p_st = 0; } else { start = pr->u.p.lb; limit = chunk + init - 1; incr = pr->u.p.st; if ( (last = (limit >= trip)) != 0 ) limit = trip; if ( p_st != NULL ) *p_st = incr; if ( incr == 1 ) { *p_lb = start + init; *p_ub = start + limit; } else { *p_lb = start + init * incr; *p_ub = start + limit * incr; } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // if } // case break; case kmp_sch_guided_iterative_chunked: { T chunkspec = pr->u.p.parm1; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_guided_chunked iterative case\n",gtid)); trip = pr->u.p.tc; // Start atomic part of calculations while(1) { ST remaining; // signed, because can be < 0 init = sh->u.s.iteration; // shared value remaining = trip - init; if ( remaining <= 0 ) { // AC: need to compare with 0 first // nothing to do, don't try atomic op status = 0; break; } if ( (T)remaining < pr->u.p.parm2 ) { // compare with K*nproc*(chunk+1), K=2 by default // use dynamic-style shcedule // atomically inrement iterations, get old value init = test_then_add( (ST*)&sh->u.s.iteration, (ST)chunkspec ); remaining = trip - init; if (remaining <= 0) { status = 0; // all iterations got by other threads } else { // got some iterations to work on status = 1; if ( (T)remaining > chunkspec ) { limit = init + chunkspec - 1; } else { last = 1; // the last chunk limit = init + remaining - 1; } // if } // if break; } // if limit = init + (UT)( remaining * *(double*)&pr->u.p.parm3 ); // divide by K*nproc if ( compare_and_swap( (ST*)&sh->u.s.iteration, (ST)init, (ST)limit ) ) { // CAS was successful, chunk obtained status = 1; --limit; break; } // if } // while if ( status != 0 ) { start = pr->u.p.lb; incr = pr->u.p.st; if ( p_st != NULL ) *p_st = incr; *p_lb = start + init * incr; *p_ub = start + limit * incr; if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } else { *p_lb = 0; *p_ub = 0; if ( p_st != NULL ) *p_st = 0; } // if } // case break; case kmp_sch_guided_analytical_chunked: { T chunkspec = pr->u.p.parm1; UT chunkIdx; #if KMP_OS_WINDOWS && KMP_ARCH_X86 /* for storing original FPCW value for Windows* OS on IA-32 architecture 8-byte version */ unsigned int oldFpcw; unsigned int fpcwSet = 0; #endif KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_guided_chunked analytical case\n", gtid ) ); trip = pr->u.p.tc; KMP_DEBUG_ASSERT(th->th.th_team_nproc > 1); KMP_DEBUG_ASSERT((2UL * chunkspec + 1) * (UT)th->th.th_team_nproc < trip); while(1) { /* this while loop is a safeguard against unexpected zero chunk sizes */ chunkIdx = test_then_inc_acq< ST >((volatile ST *) & sh->u.s.iteration ); if ( chunkIdx >= (UT)pr->u.p.parm2 ) { --trip; /* use dynamic-style scheduling */ init = chunkIdx * chunkspec + pr->u.p.count; /* need to verify init > 0 in case of overflow in the above calculation */ if ( (status = (init > 0 && init <= trip)) != 0 ) { limit = init + chunkspec -1; if ( (last = (limit >= trip)) != 0 ) limit = trip; } break; } else { /* use exponential-style scheduling */ /* The following check is to workaround the lack of long double precision on Windows* OS. This check works around the possible effect that init != 0 for chunkIdx == 0. */ #if KMP_OS_WINDOWS && KMP_ARCH_X86 /* If we haven't already done so, save original FPCW and set precision to 64-bit, as Windows* OS on IA-32 architecture defaults to 53-bit */ if ( !fpcwSet ) { oldFpcw = _control87(0,0); _control87(_PC_64,_MCW_PC); fpcwSet = 0x30000; } #endif if ( chunkIdx ) { init = __kmp_dispatch_guided_remaining< T >( trip, *( DBL * )&pr->u.p.parm3, chunkIdx ); KMP_DEBUG_ASSERT(init); init = trip - init; } else init = 0; limit = trip - __kmp_dispatch_guided_remaining< T >( trip, *( DBL * )&pr->u.p.parm3, chunkIdx + 1 ); KMP_ASSERT(init <= limit); if ( init < limit ) { KMP_DEBUG_ASSERT(limit <= trip); --limit; status = 1; break; } // if } // if } // while (1) #if KMP_OS_WINDOWS && KMP_ARCH_X86 /* restore FPCW if necessary AC: check fpcwSet flag first because oldFpcw can be uninitialized here */ if ( fpcwSet && ( oldFpcw & fpcwSet ) ) _control87(oldFpcw,_MCW_PC); #endif if ( status != 0 ) { start = pr->u.p.lb; incr = pr->u.p.st; if ( p_st != NULL ) *p_st = incr; *p_lb = start + init * incr; *p_ub = start + limit * incr; if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } } else { *p_lb = 0; *p_ub = 0; if ( p_st != NULL ) *p_st = 0; } } // case break; case kmp_sch_trapezoidal: { UT index; T parm2 = pr->u.p.parm2; T parm3 = pr->u.p.parm3; T parm4 = pr->u.p.parm4; KD_TRACE(100, ("__kmp_dispatch_next: T#%d kmp_sch_trapezoidal case\n", gtid ) ); index = test_then_inc< ST >( (volatile ST *) & sh->u.s.iteration ); init = ( index * ( (2*parm2) - (index-1)*parm4 ) ) / 2; trip = pr->u.p.tc - 1; if ( (status = ((T)index < parm3 && init <= trip)) == 0 ) { *p_lb = 0; *p_ub = 0; if ( p_st != NULL ) *p_st = 0; } else { start = pr->u.p.lb; limit = ( (index+1) * ( 2*parm2 - index*parm4 ) ) / 2 - 1; incr = pr->u.p.st; if ( (last = (limit >= trip)) != 0 ) limit = trip; if ( p_st != NULL ) *p_st = incr; if ( incr == 1 ) { *p_lb = start + init; *p_ub = start + limit; } else { *p_lb = start + init * incr; *p_ub = start + limit * incr; } if ( pr->ordered ) { pr->u.p.ordered_lower = init; pr->u.p.ordered_upper = limit; #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d ordered_lower:%%%s ordered_upper:%%%s\n", traits_t< UT >::spec, traits_t< UT >::spec ); KD_TRACE(1000, ( buff, gtid, pr->u.p.ordered_lower, pr->u.p.ordered_upper ) ); __kmp_str_free( &buff ); } #endif } // if } // if } // case break; default: { status = 0; // to avoid complaints on uninitialized variable use __kmp_msg( kmp_ms_fatal, // Severity KMP_MSG( UnknownSchedTypeDetected ), // Primary message KMP_HNT( GetNewerLibrary ), // Hint __kmp_msg_null // Variadic argument list terminator ); } break; } // switch } // if tc == 0; if ( status == 0 ) { UT num_done; num_done = test_then_inc< ST >( (volatile ST *) & sh->u.s.num_done ); #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d increment num_done:%%%s\n", traits_t< UT >::spec ); KD_TRACE(100, ( buff, gtid, sh->u.s.num_done ) ); __kmp_str_free( &buff ); } #endif if ( (ST)num_done == th->th.th_team_nproc - 1 ) { #if ( KMP_STATIC_STEAL_ENABLED ) if( pr->schedule == kmp_sch_static_steal && traits_t::type_size > 4 ) { int i; kmp_info_t **other_threads = team->t.t_threads; // loop complete, safe to destroy locks used for stealing for( i = 0; i < th->th.th_team_nproc; ++i ) { kmp_lock_t * lck = other_threads[i]->th.th_dispatch->th_steal_lock; KMP_ASSERT(lck != NULL); __kmp_destroy_lock( lck ); __kmp_free( lck ); other_threads[i]->th.th_dispatch->th_steal_lock = NULL; } } #endif /* NOTE: release this buffer to be reused */ KMP_MB(); /* Flush all pending memory write invalidates. */ sh->u.s.num_done = 0; sh->u.s.iteration = 0; /* TODO replace with general release procedure? */ if ( pr->ordered ) { sh->u.s.ordered_iteration = 0; } KMP_MB(); /* Flush all pending memory write invalidates. */ sh -> buffer_index += __kmp_dispatch_num_buffers; KD_TRACE(100, ("__kmp_dispatch_next: T#%d change buffer_index:%d\n", gtid, sh->buffer_index) ); KMP_MB(); /* Flush all pending memory write invalidates. */ } // if if ( __kmp_env_consistency_check ) { if ( pr->pushed_ws != ct_none ) { pr->pushed_ws = __kmp_pop_workshare( gtid, pr->pushed_ws, loc ); } } th -> th.th_dispatch -> th_deo_fcn = NULL; th -> th.th_dispatch -> th_dxo_fcn = NULL; th -> th.th_dispatch -> th_dispatch_sh_current = NULL; th -> th.th_dispatch -> th_dispatch_pr_current = NULL; } // if (status == 0) #if KMP_OS_WINDOWS else if ( last ) { pr->u.p.last_upper = pr->u.p.ub; } #endif /* KMP_OS_WINDOWS */ if ( p_last != NULL && status != 0 ) *p_last = last; } // if #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmp_dispatch_next: T#%%d normal case: " \ "p_lb:%%%s p_ub:%%%s p_st:%%%s p_last:%%p returning:%%d\n", traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec ); KD_TRACE(10, ( buff, gtid, *p_lb, *p_ub, p_st ? *p_st : 0, p_last, status ) ); __kmp_str_free( &buff ); } #endif #if INCLUDE_SSC_MARKS SSC_MARK_DISPATCH_NEXT(); #endif OMPT_LOOP_END; return status; } template< typename T > static void __kmp_dist_get_bounds( ident_t *loc, kmp_int32 gtid, kmp_int32 *plastiter, T *plower, T *pupper, typename traits_t< T >::signed_t incr ) { typedef typename traits_t< T >::unsigned_t UT; typedef typename traits_t< T >::signed_t ST; register kmp_uint32 team_id; register kmp_uint32 nteams; register UT trip_count; register kmp_team_t *team; kmp_info_t * th; KMP_DEBUG_ASSERT( plastiter && plower && pupper ); KE_TRACE( 10, ("__kmpc_dist_get_bounds called (%d)\n", gtid)); #ifdef KMP_DEBUG { const char * buff; // create format specifiers before the debug output buff = __kmp_str_format( "__kmpc_dist_get_bounds: T#%%d liter=%%d "\ "iter=(%%%s, %%%s, %%%s) signed?<%s>\n", traits_t< T >::spec, traits_t< T >::spec, traits_t< ST >::spec, traits_t< T >::spec ); KD_TRACE(100, ( buff, gtid, *plastiter, *plower, *pupper, incr ) ); __kmp_str_free( &buff ); } #endif if( __kmp_env_consistency_check ) { if( incr == 0 ) { __kmp_error_construct( kmp_i18n_msg_CnsLoopIncrZeroProhibited, ct_pdo, loc ); } if( incr > 0 ? (*pupper < *plower) : (*plower < *pupper) ) { // The loop is illegal. // Some zero-trip loops maintained by compiler, e.g.: // for(i=10;i<0;++i) // lower >= upper - run-time check // for(i=0;i>10;--i) // lower <= upper - run-time check // for(i=0;i>10;++i) // incr > 0 - compile-time check // for(i=10;i<0;--i) // incr < 0 - compile-time check // Compiler does not check the following illegal loops: // for(i=0;i<10;i+=incr) // where incr<0 // for(i=10;i>0;i-=incr) // where incr<0 __kmp_error_construct( kmp_i18n_msg_CnsLoopIncrIllegal, ct_pdo, loc ); } } th = __kmp_threads[gtid]; team = th->th.th_team; #if OMP_40_ENABLED KMP_DEBUG_ASSERT(th->th.th_teams_microtask); // we are in the teams construct nteams = th->th.th_teams_size.nteams; #endif team_id = team->t.t_master_tid; KMP_DEBUG_ASSERT(nteams == team->t.t_parent->t.t_nproc); // compute global trip count if( incr == 1 ) { trip_count = *pupper - *plower + 1; } else if(incr == -1) { trip_count = *plower - *pupper + 1; } else if ( incr > 0 ) { // upper-lower can exceed the limit of signed type trip_count = (UT)(*pupper - *plower) / incr + 1; } else { trip_count = (UT)(*plower - *pupper) / ( -incr ) + 1; } if( trip_count <= nteams ) { KMP_DEBUG_ASSERT( __kmp_static == kmp_sch_static_greedy || \ __kmp_static == kmp_sch_static_balanced ); // Unknown static scheduling type. // only some teams get single iteration, others get nothing if( team_id < trip_count ) { *pupper = *plower = *plower + team_id * incr; } else { *plower = *pupper + incr; // zero-trip loop } if( plastiter != NULL ) *plastiter = ( team_id == trip_count - 1 ); } else { if( __kmp_static == kmp_sch_static_balanced ) { register UT chunk = trip_count / nteams; register UT extras = trip_count % nteams; *plower += incr * ( team_id * chunk + ( team_id < extras ? team_id : extras ) ); *pupper = *plower + chunk * incr - ( team_id < extras ? 0 : incr ); if( plastiter != NULL ) *plastiter = ( team_id == nteams - 1 ); } else { register T chunk_inc_count = ( trip_count / nteams + ( ( trip_count % nteams ) ? 1 : 0) ) * incr; register T upper = *pupper; KMP_DEBUG_ASSERT( __kmp_static == kmp_sch_static_greedy ); // Unknown static scheduling type. *plower += team_id * chunk_inc_count; *pupper = *plower + chunk_inc_count - incr; // Check/correct bounds if needed if( incr > 0 ) { if( *pupper < *plower ) *pupper = traits_t::max_value; if( plastiter != NULL ) *plastiter = *plower <= upper && *pupper > upper - incr; if( *pupper > upper ) *pupper = upper; // tracker C73258 } else { if( *pupper > *plower ) *pupper = traits_t::min_value; if( plastiter != NULL ) *plastiter = *plower >= upper && *pupper < upper - incr; if( *pupper < upper ) *pupper = upper; // tracker C73258 } } } } //----------------------------------------------------------------------------------------- // Dispatch routines // Transfer call to template< type T > // __kmp_dispatch_init( ident_t *loc, int gtid, enum sched_type schedule, // T lb, T ub, ST st, ST chunk ) extern "C" { /*! @ingroup WORK_SHARING @{ @param loc Source location @param gtid Global thread id @param schedule Schedule type @param lb Lower bound @param ub Upper bound @param st Step (or increment if you prefer) @param chunk The chunk size to block with This function prepares the runtime to start a dynamically scheduled for loop, saving the loop arguments. These functions are all identical apart from the types of the arguments. */ void __kmpc_dispatch_init_4( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 lb, kmp_int32 ub, kmp_int32 st, kmp_int32 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dispatch_init< kmp_int32 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } /*! See @ref __kmpc_dispatch_init_4 */ void __kmpc_dispatch_init_4u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_uint32 lb, kmp_uint32 ub, kmp_int32 st, kmp_int32 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dispatch_init< kmp_uint32 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } /*! See @ref __kmpc_dispatch_init_4 */ void __kmpc_dispatch_init_8( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int64 lb, kmp_int64 ub, kmp_int64 st, kmp_int64 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dispatch_init< kmp_int64 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } /*! See @ref __kmpc_dispatch_init_4 */ void __kmpc_dispatch_init_8u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_uint64 lb, kmp_uint64 ub, kmp_int64 st, kmp_int64 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dispatch_init< kmp_uint64 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } /*! See @ref __kmpc_dispatch_init_4 Difference from __kmpc_dispatch_init set of functions is these functions are called for composite distribute parallel for construct. Thus before regular iterations dispatching we need to calc per-team iteration space. These functions are all identical apart from the types of the arguments. */ void __kmpc_dist_dispatch_init_4( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 *p_last, kmp_int32 lb, kmp_int32 ub, kmp_int32 st, kmp_int32 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dist_get_bounds< kmp_int32 >( loc, gtid, p_last, &lb, &ub, st ); __kmp_dispatch_init< kmp_int32 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } void __kmpc_dist_dispatch_init_4u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 *p_last, kmp_uint32 lb, kmp_uint32 ub, kmp_int32 st, kmp_int32 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dist_get_bounds< kmp_uint32 >( loc, gtid, p_last, &lb, &ub, st ); __kmp_dispatch_init< kmp_uint32 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } void __kmpc_dist_dispatch_init_8( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 *p_last, kmp_int64 lb, kmp_int64 ub, kmp_int64 st, kmp_int64 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dist_get_bounds< kmp_int64 >( loc, gtid, p_last, &lb, &ub, st ); __kmp_dispatch_init< kmp_int64 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } void __kmpc_dist_dispatch_init_8u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 *p_last, kmp_uint64 lb, kmp_uint64 ub, kmp_int64 st, kmp_int64 chunk ) { KMP_DEBUG_ASSERT( __kmp_init_serial ); __kmp_dist_get_bounds< kmp_uint64 >( loc, gtid, p_last, &lb, &ub, st ); __kmp_dispatch_init< kmp_uint64 >( loc, gtid, schedule, lb, ub, st, chunk, true ); } /*! @param loc Source code location @param gtid Global thread id @param p_last Pointer to a flag set to one if this is the last chunk or zero otherwise @param p_lb Pointer to the lower bound for the next chunk of work @param p_ub Pointer to the upper bound for the next chunk of work @param p_st Pointer to the stride for the next chunk of work @return one if there is work to be done, zero otherwise Get the next dynamically allocated chunk of work for this thread. If there is no more work, then the lb,ub and stride need not be modified. */ int __kmpc_dispatch_next_4( ident_t *loc, kmp_int32 gtid, kmp_int32 *p_last, kmp_int32 *p_lb, kmp_int32 *p_ub, kmp_int32 *p_st ) { return __kmp_dispatch_next< kmp_int32 >( loc, gtid, p_last, p_lb, p_ub, p_st ); } /*! See @ref __kmpc_dispatch_next_4 */ int __kmpc_dispatch_next_4u( ident_t *loc, kmp_int32 gtid, kmp_int32 *p_last, kmp_uint32 *p_lb, kmp_uint32 *p_ub, kmp_int32 *p_st ) { return __kmp_dispatch_next< kmp_uint32 >( loc, gtid, p_last, p_lb, p_ub, p_st ); } /*! See @ref __kmpc_dispatch_next_4 */ int __kmpc_dispatch_next_8( ident_t *loc, kmp_int32 gtid, kmp_int32 *p_last, kmp_int64 *p_lb, kmp_int64 *p_ub, kmp_int64 *p_st ) { return __kmp_dispatch_next< kmp_int64 >( loc, gtid, p_last, p_lb, p_ub, p_st ); } /*! See @ref __kmpc_dispatch_next_4 */ int __kmpc_dispatch_next_8u( ident_t *loc, kmp_int32 gtid, kmp_int32 *p_last, kmp_uint64 *p_lb, kmp_uint64 *p_ub, kmp_int64 *p_st ) { return __kmp_dispatch_next< kmp_uint64 >( loc, gtid, p_last, p_lb, p_ub, p_st ); } /*! @param loc Source code location @param gtid Global thread id Mark the end of a dynamic loop. */ void __kmpc_dispatch_fini_4( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish< kmp_uint32 >( gtid, loc ); } /*! See @ref __kmpc_dispatch_fini_4 */ void __kmpc_dispatch_fini_8( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish< kmp_uint64 >( gtid, loc ); } /*! See @ref __kmpc_dispatch_fini_4 */ void __kmpc_dispatch_fini_4u( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish< kmp_uint32 >( gtid, loc ); } /*! See @ref __kmpc_dispatch_fini_4 */ void __kmpc_dispatch_fini_8u( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish< kmp_uint64 >( gtid, loc ); } /*! @} */ //----------------------------------------------------------------------------------------- //Non-template routines from kmp_dispatch.cpp used in other sources kmp_uint32 __kmp_eq_4( kmp_uint32 value, kmp_uint32 checker) { return value == checker; } kmp_uint32 __kmp_neq_4( kmp_uint32 value, kmp_uint32 checker) { return value != checker; } kmp_uint32 __kmp_lt_4( kmp_uint32 value, kmp_uint32 checker) { return value < checker; } kmp_uint32 __kmp_ge_4( kmp_uint32 value, kmp_uint32 checker) { return value >= checker; } kmp_uint32 __kmp_le_4( kmp_uint32 value, kmp_uint32 checker) { return value <= checker; } kmp_uint32 __kmp_wait_yield_4(volatile kmp_uint32 * spinner, kmp_uint32 checker, kmp_uint32 (* pred)( kmp_uint32, kmp_uint32 ) , void * obj // Higher-level synchronization object, or NULL. ) { // note: we may not belong to a team at this point register volatile kmp_uint32 * spin = spinner; register kmp_uint32 check = checker; register kmp_uint32 spins; register kmp_uint32 (*f) ( kmp_uint32, kmp_uint32 ) = pred; register kmp_uint32 r; KMP_FSYNC_SPIN_INIT( obj, (void*) spin ); KMP_INIT_YIELD( spins ); // main wait spin loop while(!f(r = TCR_4(*spin), check)) { KMP_FSYNC_SPIN_PREPARE( obj ); /* GEH - remove this since it was accidentally introduced when kmp_wait was split. It causes problems with infinite recursion because of exit lock */ /* if ( TCR_4(__kmp_global.g.g_done) && __kmp_global.g.g_abort) __kmp_abort_thread(); */ /* if we have waited a bit, or are oversubscribed, yield */ /* pause is in the following code */ KMP_YIELD( TCR_4(__kmp_nth) > __kmp_avail_proc ); KMP_YIELD_SPIN( spins ); } KMP_FSYNC_SPIN_ACQUIRED( obj ); return r; } void __kmp_wait_yield_4_ptr(void *spinner, kmp_uint32 checker, kmp_uint32 (*pred)( void *, kmp_uint32 ), void *obj // Higher-level synchronization object, or NULL. ) { // note: we may not belong to a team at this point register void *spin = spinner; register kmp_uint32 check = checker; register kmp_uint32 spins; register kmp_uint32 (*f) ( void *, kmp_uint32 ) = pred; KMP_FSYNC_SPIN_INIT( obj, spin ); KMP_INIT_YIELD( spins ); // main wait spin loop while ( !f( spin, check ) ) { KMP_FSYNC_SPIN_PREPARE( obj ); /* if we have waited a bit, or are oversubscribed, yield */ /* pause is in the following code */ KMP_YIELD( TCR_4( __kmp_nth ) > __kmp_avail_proc ); KMP_YIELD_SPIN( spins ); } KMP_FSYNC_SPIN_ACQUIRED( obj ); } } // extern "C" #ifdef KMP_GOMP_COMPAT void __kmp_aux_dispatch_init_4( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int32 lb, kmp_int32 ub, kmp_int32 st, kmp_int32 chunk, int push_ws ) { __kmp_dispatch_init< kmp_int32 >( loc, gtid, schedule, lb, ub, st, chunk, push_ws ); } void __kmp_aux_dispatch_init_4u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_uint32 lb, kmp_uint32 ub, kmp_int32 st, kmp_int32 chunk, int push_ws ) { __kmp_dispatch_init< kmp_uint32 >( loc, gtid, schedule, lb, ub, st, chunk, push_ws ); } void __kmp_aux_dispatch_init_8( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_int64 lb, kmp_int64 ub, kmp_int64 st, kmp_int64 chunk, int push_ws ) { __kmp_dispatch_init< kmp_int64 >( loc, gtid, schedule, lb, ub, st, chunk, push_ws ); } void __kmp_aux_dispatch_init_8u( ident_t *loc, kmp_int32 gtid, enum sched_type schedule, kmp_uint64 lb, kmp_uint64 ub, kmp_int64 st, kmp_int64 chunk, int push_ws ) { __kmp_dispatch_init< kmp_uint64 >( loc, gtid, schedule, lb, ub, st, chunk, push_ws ); } void __kmp_aux_dispatch_fini_chunk_4( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish_chunk< kmp_uint32 >( gtid, loc ); } void __kmp_aux_dispatch_fini_chunk_8( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish_chunk< kmp_uint64 >( gtid, loc ); } void __kmp_aux_dispatch_fini_chunk_4u( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish_chunk< kmp_uint32 >( gtid, loc ); } void __kmp_aux_dispatch_fini_chunk_8u( ident_t *loc, kmp_int32 gtid ) { __kmp_dispatch_finish_chunk< kmp_uint64 >( gtid, loc ); } #endif /* KMP_GOMP_COMPAT */ /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */