PostgreSQL Source Code git master
All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Pages
execParallel.h File Reference
#include "access/parallel.h"
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "utils/dsa.h"
Include dependency graph for execParallel.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures

struct  ParallelExecutorInfo
 

Typedefs

typedef struct SharedExecutorInstrumentation SharedExecutorInstrumentation
 
typedef struct ParallelExecutorInfo ParallelExecutorInfo
 

Functions

ParallelExecutorInfoExecInitParallelPlan (PlanState *planstate, EState *estate, Bitmapset *sendParams, int nworkers, int64 tuples_needed)
 
void ExecParallelCreateReaders (ParallelExecutorInfo *pei)
 
void ExecParallelFinish (ParallelExecutorInfo *pei)
 
void ExecParallelCleanup (ParallelExecutorInfo *pei)
 
void ExecParallelReinitialize (PlanState *planstate, ParallelExecutorInfo *pei, Bitmapset *sendParams)
 
void ParallelQueryMain (dsm_segment *seg, shm_toc *toc)
 

Typedef Documentation

◆ ParallelExecutorInfo

◆ SharedExecutorInstrumentation

Function Documentation

◆ ExecInitParallelPlan()

ParallelExecutorInfo * ExecInitParallelPlan ( PlanState planstate,
EState estate,
Bitmapset sendParams,
int  nworkers,
int64  tuples_needed 
)

Definition at line 587 of file execParallel.c.

590{
592 ParallelContext *pcxt;
596 char *pstmt_data;
597 char *pstmt_space;
598 char *paramlistinfo_space;
599 BufferUsage *bufusage_space;
600 WalUsage *walusage_space;
601 SharedExecutorInstrumentation *instrumentation = NULL;
602 SharedJitInstrumentation *jit_instrumentation = NULL;
603 int pstmt_len;
604 int paramlistinfo_len;
605 int instrumentation_len = 0;
606 int jit_instrumentation_len = 0;
607 int instrument_offset = 0;
608 Size dsa_minsize = dsa_minimum_size();
609 char *query_string;
610 int query_len;
611
612 /*
613 * Force any initplan outputs that we're going to pass to workers to be
614 * evaluated, if they weren't already.
615 *
616 * For simplicity, we use the EState's per-output-tuple ExprContext here.
617 * That risks intra-query memory leakage, since we might pass through here
618 * many times before that ExprContext gets reset; but ExecSetParamPlan
619 * doesn't normally leak any memory in the context (see its comments), so
620 * it doesn't seem worth complicating this function's API to pass it a
621 * shorter-lived ExprContext. This might need to change someday.
622 */
624
625 /* Allocate object for return value. */
626 pei = palloc0(sizeof(ParallelExecutorInfo));
627 pei->finished = false;
628 pei->planstate = planstate;
629
630 /* Fix up and serialize plan to be sent to workers. */
631 pstmt_data = ExecSerializePlan(planstate->plan, estate);
632
633 /* Create a parallel context. */
634 pcxt = CreateParallelContext("postgres", "ParallelQueryMain", nworkers);
635 pei->pcxt = pcxt;
636
637 /*
638 * Before telling the parallel context to create a dynamic shared memory
639 * segment, we need to figure out how big it should be. Estimate space
640 * for the various things we need to store.
641 */
642
643 /* Estimate space for fixed-size state. */
647
648 /* Estimate space for query text. */
649 query_len = strlen(estate->es_sourceText);
650 shm_toc_estimate_chunk(&pcxt->estimator, query_len + 1);
652
653 /* Estimate space for serialized PlannedStmt. */
654 pstmt_len = strlen(pstmt_data) + 1;
655 shm_toc_estimate_chunk(&pcxt->estimator, pstmt_len);
657
658 /* Estimate space for serialized ParamListInfo. */
659 paramlistinfo_len = EstimateParamListSpace(estate->es_param_list_info);
660 shm_toc_estimate_chunk(&pcxt->estimator, paramlistinfo_len);
662
663 /*
664 * Estimate space for BufferUsage.
665 *
666 * If EXPLAIN is not in use and there are no extensions loaded that care,
667 * we could skip this. But we have no way of knowing whether anyone's
668 * looking at pgBufferUsage, so do it unconditionally.
669 */
671 mul_size(sizeof(BufferUsage), pcxt->nworkers));
673
674 /*
675 * Same thing for WalUsage.
676 */
678 mul_size(sizeof(WalUsage), pcxt->nworkers));
680
681 /* Estimate space for tuple queues. */
685
686 /*
687 * Give parallel-aware nodes a chance to add to the estimates, and get a
688 * count of how many PlanState nodes there are.
689 */
690 e.pcxt = pcxt;
691 e.nnodes = 0;
692 ExecParallelEstimate(planstate, &e);
693
694 /* Estimate space for instrumentation, if required. */
695 if (estate->es_instrument)
696 {
697 instrumentation_len =
698 offsetof(SharedExecutorInstrumentation, plan_node_id) +
699 sizeof(int) * e.nnodes;
700 instrumentation_len = MAXALIGN(instrumentation_len);
701 instrument_offset = instrumentation_len;
702 instrumentation_len +=
704 mul_size(e.nnodes, nworkers));
705 shm_toc_estimate_chunk(&pcxt->estimator, instrumentation_len);
707
708 /* Estimate space for JIT instrumentation, if required. */
709 if (estate->es_jit_flags != PGJIT_NONE)
710 {
711 jit_instrumentation_len =
712 offsetof(SharedJitInstrumentation, jit_instr) +
713 sizeof(JitInstrumentation) * nworkers;
714 shm_toc_estimate_chunk(&pcxt->estimator, jit_instrumentation_len);
716 }
717 }
718
719 /* Estimate space for DSA area. */
720 shm_toc_estimate_chunk(&pcxt->estimator, dsa_minsize);
722
723 /*
724 * InitializeParallelDSM() passes the active snapshot to the parallel
725 * worker, which uses it to set es_snapshot. Make sure we don't set
726 * es_snapshot differently in the child.
727 */
729
730 /* Everyone's had a chance to ask for space, so now create the DSM. */
732
733 /*
734 * OK, now we have a dynamic shared memory segment, and it should be big
735 * enough to store all of the data we estimated we would want to put into
736 * it, plus whatever general stuff (not specifically executor-related) the
737 * ParallelContext itself needs to store there. None of the space we
738 * asked for has been allocated or initialized yet, though, so do that.
739 */
740
741 /* Store fixed-size state. */
742 fpes = shm_toc_allocate(pcxt->toc, sizeof(FixedParallelExecutorState));
743 fpes->tuples_needed = tuples_needed;
745 fpes->eflags = estate->es_top_eflags;
746 fpes->jit_flags = estate->es_jit_flags;
748
749 /* Store query string */
750 query_string = shm_toc_allocate(pcxt->toc, query_len + 1);
751 memcpy(query_string, estate->es_sourceText, query_len + 1);
752 shm_toc_insert(pcxt->toc, PARALLEL_KEY_QUERY_TEXT, query_string);
753
754 /* Store serialized PlannedStmt. */
755 pstmt_space = shm_toc_allocate(pcxt->toc, pstmt_len);
756 memcpy(pstmt_space, pstmt_data, pstmt_len);
757 shm_toc_insert(pcxt->toc, PARALLEL_KEY_PLANNEDSTMT, pstmt_space);
758
759 /* Store serialized ParamListInfo. */
760 paramlistinfo_space = shm_toc_allocate(pcxt->toc, paramlistinfo_len);
761 shm_toc_insert(pcxt->toc, PARALLEL_KEY_PARAMLISTINFO, paramlistinfo_space);
762 SerializeParamList(estate->es_param_list_info, &paramlistinfo_space);
763
764 /* Allocate space for each worker's BufferUsage; no need to initialize. */
765 bufusage_space = shm_toc_allocate(pcxt->toc,
766 mul_size(sizeof(BufferUsage), pcxt->nworkers));
767 shm_toc_insert(pcxt->toc, PARALLEL_KEY_BUFFER_USAGE, bufusage_space);
768 pei->buffer_usage = bufusage_space;
769
770 /* Same for WalUsage. */
771 walusage_space = shm_toc_allocate(pcxt->toc,
772 mul_size(sizeof(WalUsage), pcxt->nworkers));
773 shm_toc_insert(pcxt->toc, PARALLEL_KEY_WAL_USAGE, walusage_space);
774 pei->wal_usage = walusage_space;
775
776 /* Set up the tuple queues that the workers will write into. */
777 pei->tqueue = ExecParallelSetupTupleQueues(pcxt, false);
778
779 /* We don't need the TupleQueueReaders yet, though. */
780 pei->reader = NULL;
781
782 /*
783 * If instrumentation options were supplied, allocate space for the data.
784 * It only gets partially initialized here; the rest happens during
785 * ExecParallelInitializeDSM.
786 */
787 if (estate->es_instrument)
788 {
789 Instrumentation *instrument;
790 int i;
791
792 instrumentation = shm_toc_allocate(pcxt->toc, instrumentation_len);
793 instrumentation->instrument_options = estate->es_instrument;
794 instrumentation->instrument_offset = instrument_offset;
795 instrumentation->num_workers = nworkers;
796 instrumentation->num_plan_nodes = e.nnodes;
797 instrument = GetInstrumentationArray(instrumentation);
798 for (i = 0; i < nworkers * e.nnodes; ++i)
799 InstrInit(&instrument[i], estate->es_instrument);
801 instrumentation);
802 pei->instrumentation = instrumentation;
803
804 if (estate->es_jit_flags != PGJIT_NONE)
805 {
806 jit_instrumentation = shm_toc_allocate(pcxt->toc,
807 jit_instrumentation_len);
808 jit_instrumentation->num_workers = nworkers;
809 memset(jit_instrumentation->jit_instr, 0,
810 sizeof(JitInstrumentation) * nworkers);
812 jit_instrumentation);
813 pei->jit_instrumentation = jit_instrumentation;
814 }
815 }
816
817 /*
818 * Create a DSA area that can be used by the leader and all workers.
819 * (However, if we failed to create a DSM and are using private memory
820 * instead, then skip this.)
821 */
822 if (pcxt->seg != NULL)
823 {
824 char *area_space;
825
826 area_space = shm_toc_allocate(pcxt->toc, dsa_minsize);
827 shm_toc_insert(pcxt->toc, PARALLEL_KEY_DSA, area_space);
828 pei->area = dsa_create_in_place(area_space, dsa_minsize,
830 pcxt->seg);
831
832 /*
833 * Serialize parameters, if any, using DSA storage. We don't dare use
834 * the main parallel query DSM for this because we might relaunch
835 * workers after the values have changed (and thus the amount of
836 * storage required has changed).
837 */
838 if (!bms_is_empty(sendParams))
839 {
840 pei->param_exec = SerializeParamExecParams(estate, sendParams,
841 pei->area);
842 fpes->param_exec = pei->param_exec;
843 }
844 }
845
846 /*
847 * Give parallel-aware nodes a chance to initialize their shared data.
848 * This also initializes the elements of instrumentation->ps_instrument,
849 * if it exists.
850 */
851 d.pcxt = pcxt;
852 d.instrumentation = instrumentation;
853 d.nnodes = 0;
854
855 /* Install our DSA area while initializing the plan. */
856 estate->es_query_dsa = pei->area;
857 ExecParallelInitializeDSM(planstate, &d);
858 estate->es_query_dsa = NULL;
859
860 /*
861 * Make sure that the world hasn't shifted under our feet. This could
862 * probably just be an Assert(), but let's be conservative for now.
863 */
864 if (e.nnodes != d.nnodes)
865 elog(ERROR, "inconsistent count of PlanState nodes");
866
867 /* OK, we're ready to rock and roll. */
868 return pei;
869}
void InitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:207
ParallelContext * CreateParallelContext(const char *library_name, const char *function_name, int nworkers)
Definition: parallel.c:169
#define bms_is_empty(a)
Definition: bitmapset.h:118
#define MAXALIGN(LEN)
Definition: c.h:765
#define Assert(condition)
Definition: c.h:812
size_t Size
Definition: c.h:559
size_t dsa_minimum_size(void)
Definition: dsa.c:1196
#define dsa_create_in_place(place, size, tranch_id, segment)
Definition: dsa.h:122
#define InvalidDsaPointer
Definition: dsa.h:78
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:225
#define PARALLEL_KEY_BUFFER_USAGE
Definition: execParallel.c:60
#define PARALLEL_KEY_JIT_INSTRUMENTATION
Definition: execParallel.c:65
#define PARALLEL_KEY_PARAMLISTINFO
Definition: execParallel.c:59
#define PARALLEL_TUPLE_QUEUE_SIZE
Definition: execParallel.c:68
static dsa_pointer SerializeParamExecParams(EState *estate, Bitmapset *params, dsa_area *area)
Definition: execParallel.c:354
#define PARALLEL_KEY_INSTRUMENTATION
Definition: execParallel.c:62
static shm_mq_handle ** ExecParallelSetupTupleQueues(ParallelContext *pcxt, bool reinitialize)
Definition: execParallel.c:535
#define PARALLEL_KEY_PLANNEDSTMT
Definition: execParallel.c:58
static bool ExecParallelEstimate(PlanState *planstate, ExecParallelEstimateContext *e)
Definition: execParallel.c:229
#define GetInstrumentationArray(sei)
Definition: execParallel.c:106
#define PARALLEL_KEY_DSA
Definition: execParallel.c:63
#define PARALLEL_KEY_EXECUTOR_FIXED
Definition: execParallel.c:57
static char * ExecSerializePlan(Plan *plan, EState *estate)
Definition: execParallel.c:145
#define PARALLEL_KEY_QUERY_TEXT
Definition: execParallel.c:64
#define PARALLEL_KEY_WAL_USAGE
Definition: execParallel.c:66
static bool ExecParallelInitializeDSM(PlanState *planstate, ExecParallelInitializeDSMContext *d)
Definition: execParallel.c:438
#define GetPerTupleExprContext(estate)
Definition: executor.h:563
void InstrInit(Instrumentation *instr, int instrument_options)
Definition: instrument.c:58
int i
Definition: isn.c:72
struct JitInstrumentation JitInstrumentation
#define PGJIT_NONE
Definition: jit.h:19
@ LWTRANCHE_PARALLEL_QUERY_DSA
Definition: lwlock.h:195
void * palloc0(Size size)
Definition: mcxt.c:1347
void ExecSetParamPlanMulti(const Bitmapset *params, ExprContext *econtext)
Definition: nodeSubplan.c:1276
Size EstimateParamListSpace(ParamListInfo paramLI)
Definition: params.c:167
void SerializeParamList(ParamListInfo paramLI, char **start_address)
Definition: params.c:229
e
Definition: preproc-init.c:82
void * shm_toc_allocate(shm_toc *toc, Size nbytes)
Definition: shm_toc.c:88
void shm_toc_insert(shm_toc *toc, uint64 key, void *address)
Definition: shm_toc.c:171
#define shm_toc_estimate_chunk(e, sz)
Definition: shm_toc.h:51
#define shm_toc_estimate_keys(e, cnt)
Definition: shm_toc.h:53
Size mul_size(Size s1, Size s2)
Definition: shmem.c:505
Snapshot GetActiveSnapshot(void)
Definition: snapmgr.c:728
struct dsa_area * es_query_dsa
Definition: execnodes.h:717
int es_top_eflags
Definition: execnodes.h:684
int es_instrument
Definition: execnodes.h:685
ParamListInfo es_param_list_info
Definition: execnodes.h:669
int es_jit_flags
Definition: execnodes.h:728
const char * es_sourceText
Definition: execnodes.h:642
Snapshot es_snapshot
Definition: execnodes.h:632
SharedExecutorInstrumentation * instrumentation
Definition: execParallel.c:121
dsm_segment * seg
Definition: parallel.h:42
shm_toc_estimator estimator
Definition: parallel.h:41
shm_toc * toc
Definition: parallel.h:44
PlanState * planstate
Definition: execParallel.h:26
struct SharedJitInstrumentation * jit_instrumentation
Definition: execParallel.h:31
BufferUsage * buffer_usage
Definition: execParallel.h:28
dsa_pointer param_exec
Definition: execParallel.h:33
ParallelContext * pcxt
Definition: execParallel.h:27
WalUsage * wal_usage
Definition: execParallel.h:29
shm_mq_handle ** tqueue
Definition: execParallel.h:36
SharedExecutorInstrumentation * instrumentation
Definition: execParallel.h:30
struct TupleQueueReader ** reader
Definition: execParallel.h:37
Plan * plan
Definition: execnodes.h:1125
JitInstrumentation jit_instr[FLEXIBLE_ARRAY_MEMBER]
Definition: jit.h:54

References ParallelExecutorInfo::area, Assert, bms_is_empty, ParallelExecutorInfo::buffer_usage, CreateParallelContext(), dsa_create_in_place, dsa_minimum_size(), FixedParallelExecutorState::eflags, elog, ERROR, EState::es_instrument, EState::es_jit_flags, EState::es_param_list_info, EState::es_query_dsa, EState::es_snapshot, EState::es_sourceText, EState::es_top_eflags, EstimateParamListSpace(), ParallelContext::estimator, ExecParallelEstimate(), ExecParallelInitializeDSM(), ExecParallelSetupTupleQueues(), ExecSerializePlan(), ExecSetParamPlanMulti(), ParallelExecutorInfo::finished, GetActiveSnapshot(), GetInstrumentationArray, GetPerTupleExprContext, i, InitializeParallelDSM(), InstrInit(), SharedExecutorInstrumentation::instrument_offset, SharedExecutorInstrumentation::instrument_options, ExecParallelInitializeDSMContext::instrumentation, ParallelExecutorInfo::instrumentation, InvalidDsaPointer, FixedParallelExecutorState::jit_flags, SharedJitInstrumentation::jit_instr, ParallelExecutorInfo::jit_instrumentation, LWTRANCHE_PARALLEL_QUERY_DSA, MAXALIGN, mul_size(), ExecParallelInitializeDSMContext::nnodes, SharedExecutorInstrumentation::num_plan_nodes, SharedExecutorInstrumentation::num_workers, SharedJitInstrumentation::num_workers, ParallelContext::nworkers, palloc0(), PARALLEL_KEY_BUFFER_USAGE, PARALLEL_KEY_DSA, PARALLEL_KEY_EXECUTOR_FIXED, PARALLEL_KEY_INSTRUMENTATION, PARALLEL_KEY_JIT_INSTRUMENTATION, PARALLEL_KEY_PARAMLISTINFO, PARALLEL_KEY_PLANNEDSTMT, PARALLEL_KEY_QUERY_TEXT, PARALLEL_KEY_WAL_USAGE, PARALLEL_TUPLE_QUEUE_SIZE, FixedParallelExecutorState::param_exec, ParallelExecutorInfo::param_exec, ExecParallelInitializeDSMContext::pcxt, ParallelExecutorInfo::pcxt, PGJIT_NONE, PlanState::plan, ParallelExecutorInfo::planstate, ParallelExecutorInfo::reader, ParallelContext::seg, SerializeParamExecParams(), SerializeParamList(), shm_toc_allocate(), shm_toc_estimate_chunk, shm_toc_estimate_keys, shm_toc_insert(), ParallelContext::toc, ParallelExecutorInfo::tqueue, FixedParallelExecutorState::tuples_needed, and ParallelExecutorInfo::wal_usage.

Referenced by ExecGather(), and ExecGatherMerge().

◆ ExecParallelCleanup()

void ExecParallelCleanup ( ParallelExecutorInfo pei)

Definition at line 1187 of file execParallel.c.

1188{
1189 /* Accumulate instrumentation, if any. */
1190 if (pei->instrumentation)
1192 pei->instrumentation);
1193
1194 /* Accumulate JIT instrumentation, if any. */
1195 if (pei->jit_instrumentation)
1197 pei->jit_instrumentation);
1198
1199 /* Free any serialized parameters. */
1200 if (DsaPointerIsValid(pei->param_exec))
1201 {
1202 dsa_free(pei->area, pei->param_exec);
1204 }
1205 if (pei->area != NULL)
1206 {
1207 dsa_detach(pei->area);
1208 pei->area = NULL;
1209 }
1210 if (pei->pcxt != NULL)
1211 {
1213 pei->pcxt = NULL;
1214 }
1215 pfree(pei);
1216}
void DestroyParallelContext(ParallelContext *pcxt)
Definition: parallel.c:946
void dsa_detach(dsa_area *area)
Definition: dsa.c:1952
void dsa_free(dsa_area *area, dsa_pointer dp)
Definition: dsa.c:826
#define DsaPointerIsValid(x)
Definition: dsa.h:106
static bool ExecParallelRetrieveInstrumentation(PlanState *planstate, SharedExecutorInstrumentation *instrumentation)
static void ExecParallelRetrieveJitInstrumentation(PlanState *planstate, SharedJitInstrumentation *shared_jit)
void pfree(void *pointer)
Definition: mcxt.c:1521

References ParallelExecutorInfo::area, DestroyParallelContext(), dsa_detach(), dsa_free(), DsaPointerIsValid, ExecParallelRetrieveInstrumentation(), ExecParallelRetrieveJitInstrumentation(), ParallelExecutorInfo::instrumentation, InvalidDsaPointer, ParallelExecutorInfo::jit_instrumentation, ParallelExecutorInfo::param_exec, ParallelExecutorInfo::pcxt, pfree(), and ParallelExecutorInfo::planstate.

Referenced by ExecShutdownGather(), and ExecShutdownGatherMerge().

◆ ExecParallelCreateReaders()

void ExecParallelCreateReaders ( ParallelExecutorInfo pei)

Definition at line 878 of file execParallel.c.

879{
880 int nworkers = pei->pcxt->nworkers_launched;
881 int i;
882
883 Assert(pei->reader == NULL);
884
885 if (nworkers > 0)
886 {
887 pei->reader = (TupleQueueReader **)
888 palloc(nworkers * sizeof(TupleQueueReader *));
889
890 for (i = 0; i < nworkers; i++)
891 {
893 pei->pcxt->worker[i].bgwhandle);
894 pei->reader[i] = CreateTupleQueueReader(pei->tqueue[i]);
895 }
896 }
897}
void * palloc(Size size)
Definition: mcxt.c:1317
void shm_mq_set_handle(shm_mq_handle *mqh, BackgroundWorkerHandle *handle)
Definition: shm_mq.c:319
ParallelWorkerInfo * worker
Definition: parallel.h:45
int nworkers_launched
Definition: parallel.h:37
BackgroundWorkerHandle * bgwhandle
Definition: parallel.h:27
TupleQueueReader * CreateTupleQueueReader(shm_mq_handle *handle)
Definition: tqueue.c:139

References Assert, ParallelWorkerInfo::bgwhandle, CreateTupleQueueReader(), i, ParallelContext::nworkers_launched, palloc(), ParallelExecutorInfo::pcxt, ParallelExecutorInfo::reader, shm_mq_set_handle(), ParallelExecutorInfo::tqueue, and ParallelContext::worker.

Referenced by ExecGather(), and ExecGatherMerge().

◆ ExecParallelFinish()

void ExecParallelFinish ( ParallelExecutorInfo pei)

Definition at line 1134 of file execParallel.c.

1135{
1136 int nworkers = pei->pcxt->nworkers_launched;
1137 int i;
1138
1139 /* Make this be a no-op if called twice in a row. */
1140 if (pei->finished)
1141 return;
1142
1143 /*
1144 * Detach from tuple queues ASAP, so that any still-active workers will
1145 * notice that no further results are wanted.
1146 */
1147 if (pei->tqueue != NULL)
1148 {
1149 for (i = 0; i < nworkers; i++)
1150 shm_mq_detach(pei->tqueue[i]);
1151 pfree(pei->tqueue);
1152 pei->tqueue = NULL;
1153 }
1154
1155 /*
1156 * While we're waiting for the workers to finish, let's get rid of the
1157 * tuple queue readers. (Any other local cleanup could be done here too.)
1158 */
1159 if (pei->reader != NULL)
1160 {
1161 for (i = 0; i < nworkers; i++)
1163 pfree(pei->reader);
1164 pei->reader = NULL;
1165 }
1166
1167 /* Now wait for the workers to finish. */
1169
1170 /*
1171 * Next, accumulate buffer/WAL usage. (This must wait for the workers to
1172 * finish, or we might get incomplete data.)
1173 */
1174 for (i = 0; i < nworkers; i++)
1176
1177 pei->finished = true;
1178}
void WaitForParallelWorkersToFinish(ParallelContext *pcxt)
Definition: parallel.c:792
void InstrAccumParallelQuery(BufferUsage *bufusage, WalUsage *walusage)
Definition: instrument.c:218
void shm_mq_detach(shm_mq_handle *mqh)
Definition: shm_mq.c:843
void DestroyTupleQueueReader(TupleQueueReader *reader)
Definition: tqueue.c:155

References ParallelExecutorInfo::buffer_usage, DestroyTupleQueueReader(), ParallelExecutorInfo::finished, i, InstrAccumParallelQuery(), ParallelContext::nworkers_launched, ParallelExecutorInfo::pcxt, pfree(), ParallelExecutorInfo::reader, shm_mq_detach(), ParallelExecutorInfo::tqueue, WaitForParallelWorkersToFinish(), and ParallelExecutorInfo::wal_usage.

Referenced by ExecShutdownGatherMergeWorkers(), and ExecShutdownGatherWorkers().

◆ ExecParallelReinitialize()

void ExecParallelReinitialize ( PlanState planstate,
ParallelExecutorInfo pei,
Bitmapset sendParams 
)

Definition at line 904 of file execParallel.c.

907{
908 EState *estate = planstate->state;
910
911 /* Old workers must already be shut down */
912 Assert(pei->finished);
913
914 /*
915 * Force any initplan outputs that we're going to pass to workers to be
916 * evaluated, if they weren't already (see comments in
917 * ExecInitParallelPlan).
918 */
920
922 pei->tqueue = ExecParallelSetupTupleQueues(pei->pcxt, true);
923 pei->reader = NULL;
924 pei->finished = false;
925
927
928 /* Free any serialized parameters from the last round. */
929 if (DsaPointerIsValid(fpes->param_exec))
930 {
931 dsa_free(pei->area, fpes->param_exec);
933 }
934
935 /* Serialize current parameter values if required. */
936 if (!bms_is_empty(sendParams))
937 {
938 pei->param_exec = SerializeParamExecParams(estate, sendParams,
939 pei->area);
940 fpes->param_exec = pei->param_exec;
941 }
942
943 /* Traverse plan tree and let each child node reset associated state. */
944 estate->es_query_dsa = pei->area;
945 ExecParallelReInitializeDSM(planstate, pei->pcxt);
946 estate->es_query_dsa = NULL;
947}
void ReinitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:504
static bool ExecParallelReInitializeDSM(PlanState *planstate, ParallelContext *pcxt)
Definition: execParallel.c:953
void * shm_toc_lookup(shm_toc *toc, uint64 key, bool noError)
Definition: shm_toc.c:232
EState * state
Definition: execnodes.h:1127

References ParallelExecutorInfo::area, Assert, bms_is_empty, dsa_free(), DsaPointerIsValid, EState::es_query_dsa, ExecParallelReInitializeDSM(), ExecParallelSetupTupleQueues(), ExecSetParamPlanMulti(), ParallelExecutorInfo::finished, GetPerTupleExprContext, InvalidDsaPointer, PARALLEL_KEY_EXECUTOR_FIXED, FixedParallelExecutorState::param_exec, ParallelExecutorInfo::param_exec, ParallelExecutorInfo::pcxt, ParallelExecutorInfo::reader, ReinitializeParallelDSM(), SerializeParamExecParams(), shm_toc_lookup(), PlanState::state, ParallelContext::toc, and ParallelExecutorInfo::tqueue.

Referenced by ExecGather(), and ExecGatherMerge().

◆ ParallelQueryMain()

void ParallelQueryMain ( dsm_segment seg,
shm_toc toc 
)

Definition at line 1403 of file execParallel.c.

1404{
1406 BufferUsage *buffer_usage;
1407 WalUsage *wal_usage;
1408 DestReceiver *receiver;
1409 QueryDesc *queryDesc;
1410 SharedExecutorInstrumentation *instrumentation;
1411 SharedJitInstrumentation *jit_instrumentation;
1412 int instrument_options = 0;
1413 void *area_space;
1414 dsa_area *area;
1416
1417 /* Get fixed-size state. */
1418 fpes = shm_toc_lookup(toc, PARALLEL_KEY_EXECUTOR_FIXED, false);
1419
1420 /* Set up DestReceiver, SharedExecutorInstrumentation, and QueryDesc. */
1421 receiver = ExecParallelGetReceiver(seg, toc);
1422 instrumentation = shm_toc_lookup(toc, PARALLEL_KEY_INSTRUMENTATION, true);
1423 if (instrumentation != NULL)
1424 instrument_options = instrumentation->instrument_options;
1425 jit_instrumentation = shm_toc_lookup(toc, PARALLEL_KEY_JIT_INSTRUMENTATION,
1426 true);
1427 queryDesc = ExecParallelGetQueryDesc(toc, receiver, instrument_options);
1428
1429 /* Setting debug_query_string for individual workers */
1430 debug_query_string = queryDesc->sourceText;
1431
1432 /* Report workers' query for monitoring purposes */
1434
1435 /* Attach to the dynamic shared memory area. */
1436 area_space = shm_toc_lookup(toc, PARALLEL_KEY_DSA, false);
1437 area = dsa_attach_in_place(area_space, seg);
1438
1439 /* Start up the executor */
1440 queryDesc->plannedstmt->jitFlags = fpes->jit_flags;
1441 ExecutorStart(queryDesc, fpes->eflags);
1442
1443 /* Special executor initialization steps for parallel workers */
1444 queryDesc->planstate->state->es_query_dsa = area;
1445 if (DsaPointerIsValid(fpes->param_exec))
1446 {
1447 char *paramexec_space;
1448
1449 paramexec_space = dsa_get_address(area, fpes->param_exec);
1450 RestoreParamExecParams(paramexec_space, queryDesc->estate);
1451 }
1452 pwcxt.toc = toc;
1453 pwcxt.seg = seg;
1454 ExecParallelInitializeWorker(queryDesc->planstate, &pwcxt);
1455
1456 /* Pass down any tuple bound */
1457 ExecSetTupleBound(fpes->tuples_needed, queryDesc->planstate);
1458
1459 /*
1460 * Prepare to track buffer/WAL usage during query execution.
1461 *
1462 * We do this after starting up the executor to match what happens in the
1463 * leader, which also doesn't count buffer accesses and WAL activity that
1464 * occur during executor startup.
1465 */
1467
1468 /*
1469 * Run the plan. If we specified a tuple bound, be careful not to demand
1470 * more tuples than that.
1471 */
1472 ExecutorRun(queryDesc,
1474 fpes->tuples_needed < 0 ? (int64) 0 : fpes->tuples_needed);
1475
1476 /* Shut down the executor */
1477 ExecutorFinish(queryDesc);
1478
1479 /* Report buffer/WAL usage during parallel execution. */
1480 buffer_usage = shm_toc_lookup(toc, PARALLEL_KEY_BUFFER_USAGE, false);
1481 wal_usage = shm_toc_lookup(toc, PARALLEL_KEY_WAL_USAGE, false);
1483 &wal_usage[ParallelWorkerNumber]);
1484
1485 /* Report instrumentation data if any instrumentation options are set. */
1486 if (instrumentation != NULL)
1488 instrumentation);
1489
1490 /* Report JIT instrumentation data if any */
1491 if (queryDesc->estate->es_jit && jit_instrumentation != NULL)
1492 {
1493 Assert(ParallelWorkerNumber < jit_instrumentation->num_workers);
1494 jit_instrumentation->jit_instr[ParallelWorkerNumber] =
1495 queryDesc->estate->es_jit->instr;
1496 }
1497
1498 /* Must do this after capturing instrumentation. */
1499 ExecutorEnd(queryDesc);
1500
1501 /* Cleanup. */
1502 dsa_detach(area);
1503 FreeQueryDesc(queryDesc);
1504 receiver->rDestroy(receiver);
1505}
int ParallelWorkerNumber
Definition: parallel.c:114
void pgstat_report_activity(BackendState state, const char *cmd_str)
@ STATE_RUNNING
int64_t int64
Definition: c.h:482
dsa_area * dsa_attach_in_place(void *place, dsm_segment *segment)
Definition: dsa.c:545
void * dsa_get_address(dsa_area *area, dsa_pointer dp)
Definition: dsa.c:942
void ExecutorEnd(QueryDesc *queryDesc)
Definition: execMain.c:463
void ExecutorFinish(QueryDesc *queryDesc)
Definition: execMain.c:403
void ExecutorStart(QueryDesc *queryDesc, int eflags)
Definition: execMain.c:119
void ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, uint64 count)
Definition: execMain.c:294
static QueryDesc * ExecParallelGetQueryDesc(shm_toc *toc, DestReceiver *receiver, int instrument_options)
static DestReceiver * ExecParallelGetReceiver(dsm_segment *seg, shm_toc *toc)
static bool ExecParallelInitializeWorker(PlanState *planstate, ParallelWorkerContext *pwcxt)
static bool ExecParallelReportInstrumentation(PlanState *planstate, SharedExecutorInstrumentation *instrumentation)
static void RestoreParamExecParams(char *start_address, EState *estate)
Definition: execParallel.c:409
void ExecSetTupleBound(int64 tuples_needed, PlanState *child_node)
Definition: execProcnode.c:848
void InstrEndParallelQuery(BufferUsage *bufusage, WalUsage *walusage)
Definition: instrument.c:208
void InstrStartParallelQuery(void)
Definition: instrument.c:200
const char * debug_query_string
Definition: postgres.c:87
void FreeQueryDesc(QueryDesc *qdesc)
Definition: pquery.c:105
@ ForwardScanDirection
Definition: sdir.h:28
struct JitContext * es_jit
Definition: execnodes.h:729
JitInstrumentation instr
Definition: jit.h:62
dsm_segment * seg
Definition: parallel.h:52
int jitFlags
Definition: plannodes.h:68
const char * sourceText
Definition: execdesc.h:38
EState * estate
Definition: execdesc.h:48
PlannedStmt * plannedstmt
Definition: execdesc.h:37
PlanState * planstate
Definition: execdesc.h:49
void(* rDestroy)(DestReceiver *self)
Definition: dest.h:126
Definition: dsa.c:348

References Assert, debug_query_string, dsa_attach_in_place(), dsa_detach(), dsa_get_address(), DsaPointerIsValid, FixedParallelExecutorState::eflags, EState::es_jit, EState::es_query_dsa, QueryDesc::estate, ExecParallelGetQueryDesc(), ExecParallelGetReceiver(), ExecParallelInitializeWorker(), ExecParallelReportInstrumentation(), ExecSetTupleBound(), ExecutorEnd(), ExecutorFinish(), ExecutorRun(), ExecutorStart(), ForwardScanDirection, FreeQueryDesc(), JitContext::instr, InstrEndParallelQuery(), InstrStartParallelQuery(), SharedExecutorInstrumentation::instrument_options, FixedParallelExecutorState::jit_flags, SharedJitInstrumentation::jit_instr, PlannedStmt::jitFlags, PARALLEL_KEY_BUFFER_USAGE, PARALLEL_KEY_DSA, PARALLEL_KEY_EXECUTOR_FIXED, PARALLEL_KEY_INSTRUMENTATION, PARALLEL_KEY_JIT_INSTRUMENTATION, PARALLEL_KEY_WAL_USAGE, ParallelWorkerNumber, FixedParallelExecutorState::param_exec, pgstat_report_activity(), QueryDesc::plannedstmt, QueryDesc::planstate, _DestReceiver::rDestroy, RestoreParamExecParams(), ParallelWorkerContext::seg, shm_toc_lookup(), QueryDesc::sourceText, PlanState::state, STATE_RUNNING, ParallelWorkerContext::toc, and FixedParallelExecutorState::tuples_needed.