PostgreSQL Source Code  git master
vacuumparallel.c File Reference
#include "postgres.h"
#include "access/amapi.h"
#include "access/table.h"
#include "access/xact.h"
#include "catalog/index.h"
#include "commands/vacuum.h"
#include "optimizer/paths.h"
#include "pgstat.h"
#include "storage/bufmgr.h"
#include "tcop/tcopprot.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
Include dependency graph for vacuumparallel.c:

Go to the source code of this file.

Data Structures

struct  PVShared
 
struct  PVIndStats
 
struct  ParallelVacuumState
 

Macros

#define PARALLEL_VACUUM_KEY_SHARED   1
 
#define PARALLEL_VACUUM_KEY_DEAD_ITEMS   2
 
#define PARALLEL_VACUUM_KEY_QUERY_TEXT   3
 
#define PARALLEL_VACUUM_KEY_BUFFER_USAGE   4
 
#define PARALLEL_VACUUM_KEY_WAL_USAGE   5
 
#define PARALLEL_VACUUM_KEY_INDEX_STATS   6
 

Typedefs

typedef struct PVShared PVShared
 
typedef enum PVIndVacStatus PVIndVacStatus
 
typedef struct PVIndStats PVIndStats
 

Enumerations

enum  PVIndVacStatus { PARALLEL_INDVAC_STATUS_INITIAL = 0 , PARALLEL_INDVAC_STATUS_NEED_BULKDELETE , PARALLEL_INDVAC_STATUS_NEED_CLEANUP , PARALLEL_INDVAC_STATUS_COMPLETED }
 

Functions

static int parallel_vacuum_compute_workers (Relation *indrels, int nindexes, int nrequested, bool *will_parallel_vacuum)
 
static void parallel_vacuum_process_all_indexes (ParallelVacuumState *pvs, int num_index_scans, bool vacuum)
 
static void parallel_vacuum_process_safe_indexes (ParallelVacuumState *pvs)
 
static void parallel_vacuum_process_unsafe_indexes (ParallelVacuumState *pvs)
 
static void parallel_vacuum_process_one_index (ParallelVacuumState *pvs, Relation indrel, PVIndStats *indstats)
 
static bool parallel_vacuum_index_is_parallel_safe (Relation indrel, int num_index_scans, bool vacuum)
 
static void parallel_vacuum_error_callback (void *arg)
 
ParallelVacuumStateparallel_vacuum_init (Relation rel, Relation *indrels, int nindexes, int nrequested_workers, int max_items, int elevel, BufferAccessStrategy bstrategy)
 
void parallel_vacuum_end (ParallelVacuumState *pvs, IndexBulkDeleteResult **istats)
 
VacDeadItemsparallel_vacuum_get_dead_items (ParallelVacuumState *pvs)
 
void parallel_vacuum_bulkdel_all_indexes (ParallelVacuumState *pvs, long num_table_tuples, int num_index_scans)
 
void parallel_vacuum_cleanup_all_indexes (ParallelVacuumState *pvs, long num_table_tuples, int num_index_scans, bool estimated_count)
 
void parallel_vacuum_main (dsm_segment *seg, shm_toc *toc)
 

Macro Definition Documentation

◆ PARALLEL_VACUUM_KEY_BUFFER_USAGE

#define PARALLEL_VACUUM_KEY_BUFFER_USAGE   4

Definition at line 49 of file vacuumparallel.c.

◆ PARALLEL_VACUUM_KEY_DEAD_ITEMS

#define PARALLEL_VACUUM_KEY_DEAD_ITEMS   2

Definition at line 47 of file vacuumparallel.c.

◆ PARALLEL_VACUUM_KEY_INDEX_STATS

#define PARALLEL_VACUUM_KEY_INDEX_STATS   6

Definition at line 51 of file vacuumparallel.c.

◆ PARALLEL_VACUUM_KEY_QUERY_TEXT

#define PARALLEL_VACUUM_KEY_QUERY_TEXT   3

Definition at line 48 of file vacuumparallel.c.

◆ PARALLEL_VACUUM_KEY_SHARED

#define PARALLEL_VACUUM_KEY_SHARED   1

Definition at line 46 of file vacuumparallel.c.

◆ PARALLEL_VACUUM_KEY_WAL_USAGE

#define PARALLEL_VACUUM_KEY_WAL_USAGE   5

Definition at line 50 of file vacuumparallel.c.

Typedef Documentation

◆ PVIndStats

typedef struct PVIndStats PVIndStats

◆ PVIndVacStatus

◆ PVShared

typedef struct PVShared PVShared

Enumeration Type Documentation

◆ PVIndVacStatus

Enumerator
PARALLEL_INDVAC_STATUS_INITIAL 
PARALLEL_INDVAC_STATUS_NEED_BULKDELETE 
PARALLEL_INDVAC_STATUS_NEED_CLEANUP 
PARALLEL_INDVAC_STATUS_COMPLETED 

Definition at line 109 of file vacuumparallel.c.

110 {
PVIndVacStatus
@ PARALLEL_INDVAC_STATUS_NEED_CLEANUP
@ PARALLEL_INDVAC_STATUS_INITIAL
@ PARALLEL_INDVAC_STATUS_NEED_BULKDELETE
@ PARALLEL_INDVAC_STATUS_COMPLETED

Function Documentation

◆ parallel_vacuum_bulkdel_all_indexes()

void parallel_vacuum_bulkdel_all_indexes ( ParallelVacuumState pvs,
long  num_table_tuples,
int  num_index_scans 
)

Definition at line 455 of file vacuumparallel.c.

457 {
459 
460  /*
461  * We can only provide an approximate value of num_heap_tuples, at least
462  * for now.
463  */
464  pvs->shared->reltuples = num_table_tuples;
465  pvs->shared->estimated_count = true;
466 
467  parallel_vacuum_process_all_indexes(pvs, num_index_scans, true);
468 }
#define IsParallelWorker()
Definition: parallel.h:61
Assert(fmt[strlen(fmt) - 1] !='\n')
double reltuples
bool estimated_count
static void parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans, bool vacuum)

References Assert(), PVShared::estimated_count, IsParallelWorker, parallel_vacuum_process_all_indexes(), PVShared::reltuples, and ParallelVacuumState::shared.

Referenced by lazy_vacuum_all_indexes().

◆ parallel_vacuum_cleanup_all_indexes()

void parallel_vacuum_cleanup_all_indexes ( ParallelVacuumState pvs,
long  num_table_tuples,
int  num_index_scans,
bool  estimated_count 
)

Definition at line 474 of file vacuumparallel.c.

476 {
478 
479  /*
480  * We can provide a better estimate of total number of surviving tuples
481  * (we assume indexes are more interested in that than in the number of
482  * nominally live tuples).
483  */
484  pvs->shared->reltuples = num_table_tuples;
485  pvs->shared->estimated_count = estimated_count;
486 
487  parallel_vacuum_process_all_indexes(pvs, num_index_scans, false);
488 }

References Assert(), PVShared::estimated_count, IsParallelWorker, parallel_vacuum_process_all_indexes(), PVShared::reltuples, and ParallelVacuumState::shared.

Referenced by lazy_cleanup_all_indexes().

◆ parallel_vacuum_compute_workers()

static int parallel_vacuum_compute_workers ( Relation indrels,
int  nindexes,
int  nrequested,
bool will_parallel_vacuum 
)
static

Definition at line 504 of file vacuumparallel.c.

506 {
507  int nindexes_parallel = 0;
508  int nindexes_parallel_bulkdel = 0;
509  int nindexes_parallel_cleanup = 0;
510  int parallel_workers;
511 
512  /*
513  * We don't allow performing parallel operation in standalone backend or
514  * when parallelism is disabled.
515  */
517  return 0;
518 
519  /*
520  * Compute the number of indexes that can participate in parallel vacuum.
521  */
522  for (int i = 0; i < nindexes; i++)
523  {
524  Relation indrel = indrels[i];
525  uint8 vacoptions = indrel->rd_indam->amparallelvacuumoptions;
526 
527  /* Skip index that is not a suitable target for parallel index vacuum */
528  if (vacoptions == VACUUM_OPTION_NO_PARALLEL ||
530  continue;
531 
532  will_parallel_vacuum[i] = true;
533 
534  if ((vacoptions & VACUUM_OPTION_PARALLEL_BULKDEL) != 0)
535  nindexes_parallel_bulkdel++;
536  if (((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) != 0) ||
537  ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) != 0))
538  nindexes_parallel_cleanup++;
539  }
540 
541  nindexes_parallel = Max(nindexes_parallel_bulkdel,
542  nindexes_parallel_cleanup);
543 
544  /* The leader process takes one index */
545  nindexes_parallel--;
546 
547  /* No index supports parallel vacuum */
548  if (nindexes_parallel <= 0)
549  return 0;
550 
551  /* Compute the parallel degree */
552  parallel_workers = (nrequested > 0) ?
553  Min(nrequested, nindexes_parallel) : nindexes_parallel;
554 
555  /* Cap by max_parallel_maintenance_workers */
556  parallel_workers = Min(parallel_workers, max_parallel_maintenance_workers);
557 
558  return parallel_workers;
559 }
int min_parallel_index_scan_size
Definition: allpaths.c:67
#define RelationGetNumberOfBlocks(reln)
Definition: bufmgr.h:147
#define Min(x, y)
Definition: c.h:976
#define Max(x, y)
Definition: c.h:970
unsigned char uint8
Definition: c.h:440
int max_parallel_maintenance_workers
Definition: globals.c:128
bool IsUnderPostmaster
Definition: globals.c:113
int i
Definition: isn.c:73
uint8 amparallelvacuumoptions
Definition: amapi.h:248
struct IndexAmRoutine * rd_indam
Definition: rel.h:202
#define VACUUM_OPTION_PARALLEL_CLEANUP
Definition: vacuum.h:62
#define VACUUM_OPTION_NO_PARALLEL
Definition: vacuum.h:41
#define VACUUM_OPTION_PARALLEL_BULKDEL
Definition: vacuum.h:47
#define VACUUM_OPTION_PARALLEL_COND_CLEANUP
Definition: vacuum.h:54

References IndexAmRoutine::amparallelvacuumoptions, i, IsUnderPostmaster, Max, max_parallel_maintenance_workers, Min, min_parallel_index_scan_size, RelationData::rd_indam, RelationGetNumberOfBlocks, VACUUM_OPTION_NO_PARALLEL, VACUUM_OPTION_PARALLEL_BULKDEL, VACUUM_OPTION_PARALLEL_CLEANUP, and VACUUM_OPTION_PARALLEL_COND_CLEANUP.

Referenced by parallel_vacuum_init().

◆ parallel_vacuum_end()

void parallel_vacuum_end ( ParallelVacuumState pvs,
IndexBulkDeleteResult **  istats 
)

Definition at line 419 of file vacuumparallel.c.

420 {
422 
423  /* Copy the updated statistics */
424  for (int i = 0; i < pvs->nindexes; i++)
425  {
426  PVIndStats *indstats = &(pvs->indstats[i]);
427 
428  if (indstats->istat_updated)
429  {
430  istats[i] = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
431  memcpy(istats[i], &indstats->istat, sizeof(IndexBulkDeleteResult));
432  }
433  else
434  istats[i] = NULL;
435  }
436 
439 
441  pfree(pvs);
442 }
void DestroyParallelContext(ParallelContext *pcxt)
Definition: parallel.c:927
void pfree(void *pointer)
Definition: mcxt.c:1252
void * palloc0(Size size)
Definition: mcxt.c:1176
bool istat_updated
IndexBulkDeleteResult istat
ParallelContext * pcxt
PVIndStats * indstats
void ExitParallelMode(void)
Definition: xact.c:1045

References Assert(), DestroyParallelContext(), ExitParallelMode(), i, ParallelVacuumState::indstats, IsParallelWorker, PVIndStats::istat, PVIndStats::istat_updated, ParallelVacuumState::nindexes, palloc0(), ParallelVacuumState::pcxt, pfree(), and ParallelVacuumState::will_parallel_vacuum.

Referenced by dead_items_cleanup().

◆ parallel_vacuum_error_callback()

static void parallel_vacuum_error_callback ( void *  arg)
static

Definition at line 1051 of file vacuumparallel.c.

1052 {
1053  ParallelVacuumState *errinfo = arg;
1054 
1055  switch (errinfo->status)
1056  {
1058  errcontext("while vacuuming index \"%s\" of relation \"%s.%s\"",
1059  errinfo->indname,
1060  errinfo->relnamespace,
1061  errinfo->relname);
1062  break;
1064  errcontext("while cleaning up index \"%s\" of relation \"%s.%s\"",
1065  errinfo->indname,
1066  errinfo->relnamespace,
1067  errinfo->relname);
1068  break;
1071  default:
1072  return;
1073  }
1074 }
#define errcontext
Definition: elog.h:192
void * arg
PVIndVacStatus status

References arg, errcontext, ParallelVacuumState::indname, PARALLEL_INDVAC_STATUS_COMPLETED, PARALLEL_INDVAC_STATUS_INITIAL, PARALLEL_INDVAC_STATUS_NEED_BULKDELETE, PARALLEL_INDVAC_STATUS_NEED_CLEANUP, ParallelVacuumState::relname, ParallelVacuumState::relnamespace, and ParallelVacuumState::status.

Referenced by parallel_vacuum_main().

◆ parallel_vacuum_get_dead_items()

VacDeadItems* parallel_vacuum_get_dead_items ( ParallelVacuumState pvs)

Definition at line 446 of file vacuumparallel.c.

447 {
448  return pvs->dead_items;
449 }
VacDeadItems * dead_items

References ParallelVacuumState::dead_items.

Referenced by dead_items_alloc().

◆ parallel_vacuum_index_is_parallel_safe()

static bool parallel_vacuum_index_is_parallel_safe ( Relation  indrel,
int  num_index_scans,
bool  vacuum 
)
static

Definition at line 898 of file vacuumparallel.c.

900 {
901  uint8 vacoptions;
902 
903  vacoptions = indrel->rd_indam->amparallelvacuumoptions;
904 
905  /* In parallel vacuum case, check if it supports parallel bulk-deletion */
906  if (vacuum)
907  return ((vacoptions & VACUUM_OPTION_PARALLEL_BULKDEL) != 0);
908 
909  /* Not safe, if the index does not support parallel cleanup */
910  if (((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) == 0) &&
911  ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) == 0))
912  return false;
913 
914  /*
915  * Not safe, if the index supports parallel cleanup conditionally, but we
916  * have already processed the index (for bulkdelete). We do this to avoid
917  * the need to invoke workers when parallel index cleanup doesn't need to
918  * scan the index. See the comments for option
919  * VACUUM_OPTION_PARALLEL_COND_CLEANUP to know when indexes support
920  * parallel cleanup conditionally.
921  */
922  if (num_index_scans > 0 &&
923  ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) != 0))
924  return false;
925 
926  return true;
927 }
void vacuum(List *relations, VacuumParams *params, BufferAccessStrategy bstrategy, bool isTopLevel)
Definition: vacuum.c:296

References IndexAmRoutine::amparallelvacuumoptions, RelationData::rd_indam, vacuum(), VACUUM_OPTION_PARALLEL_BULKDEL, VACUUM_OPTION_PARALLEL_CLEANUP, and VACUUM_OPTION_PARALLEL_COND_CLEANUP.

Referenced by parallel_vacuum_process_all_indexes().

◆ parallel_vacuum_init()

ParallelVacuumState* parallel_vacuum_init ( Relation  rel,
Relation indrels,
int  nindexes,
int  nrequested_workers,
int  max_items,
int  elevel,
BufferAccessStrategy  bstrategy 
)

Definition at line 224 of file vacuumparallel.c.

227 {
228  ParallelVacuumState *pvs;
229  ParallelContext *pcxt;
230  PVShared *shared;
231  VacDeadItems *dead_items;
232  PVIndStats *indstats;
233  BufferUsage *buffer_usage;
234  WalUsage *wal_usage;
235  bool *will_parallel_vacuum;
236  Size est_indstats_len;
237  Size est_shared_len;
238  Size est_dead_items_len;
239  int nindexes_mwm = 0;
240  int parallel_workers = 0;
241  int querylen;
242 
243  /*
244  * A parallel vacuum must be requested and there must be indexes on the
245  * relation
246  */
247  Assert(nrequested_workers >= 0);
248  Assert(nindexes > 0);
249 
250  /*
251  * Compute the number of parallel vacuum workers to launch
252  */
253  will_parallel_vacuum = (bool *) palloc0(sizeof(bool) * nindexes);
254  parallel_workers = parallel_vacuum_compute_workers(indrels, nindexes,
255  nrequested_workers,
256  will_parallel_vacuum);
257  if (parallel_workers <= 0)
258  {
259  /* Can't perform vacuum in parallel -- return NULL */
260  pfree(will_parallel_vacuum);
261  return NULL;
262  }
263 
265  pvs->indrels = indrels;
266  pvs->nindexes = nindexes;
267  pvs->will_parallel_vacuum = will_parallel_vacuum;
268  pvs->bstrategy = bstrategy;
269 
271  pcxt = CreateParallelContext("postgres", "parallel_vacuum_main",
272  parallel_workers);
273  Assert(pcxt->nworkers > 0);
274  pvs->pcxt = pcxt;
275 
276  /* Estimate size for index vacuum stats -- PARALLEL_VACUUM_KEY_INDEX_STATS */
277  est_indstats_len = mul_size(sizeof(PVIndStats), nindexes);
278  shm_toc_estimate_chunk(&pcxt->estimator, est_indstats_len);
279  shm_toc_estimate_keys(&pcxt->estimator, 1);
280 
281  /* Estimate size for shared information -- PARALLEL_VACUUM_KEY_SHARED */
282  est_shared_len = sizeof(PVShared);
283  shm_toc_estimate_chunk(&pcxt->estimator, est_shared_len);
284  shm_toc_estimate_keys(&pcxt->estimator, 1);
285 
286  /* Estimate size for dead_items -- PARALLEL_VACUUM_KEY_DEAD_ITEMS */
287  est_dead_items_len = vac_max_items_to_alloc_size(max_items);
288  shm_toc_estimate_chunk(&pcxt->estimator, est_dead_items_len);
289  shm_toc_estimate_keys(&pcxt->estimator, 1);
290 
291  /*
292  * Estimate space for BufferUsage and WalUsage --
293  * PARALLEL_VACUUM_KEY_BUFFER_USAGE and PARALLEL_VACUUM_KEY_WAL_USAGE.
294  *
295  * If there are no extensions loaded that care, we could skip this. We
296  * have no way of knowing whether anyone's looking at pgBufferUsage or
297  * pgWalUsage, so do it unconditionally.
298  */
300  mul_size(sizeof(BufferUsage), pcxt->nworkers));
301  shm_toc_estimate_keys(&pcxt->estimator, 1);
303  mul_size(sizeof(WalUsage), pcxt->nworkers));
304  shm_toc_estimate_keys(&pcxt->estimator, 1);
305 
306  /* Finally, estimate PARALLEL_VACUUM_KEY_QUERY_TEXT space */
307  if (debug_query_string)
308  {
309  querylen = strlen(debug_query_string);
310  shm_toc_estimate_chunk(&pcxt->estimator, querylen + 1);
311  shm_toc_estimate_keys(&pcxt->estimator, 1);
312  }
313  else
314  querylen = 0; /* keep compiler quiet */
315 
316  InitializeParallelDSM(pcxt);
317 
318  /* Prepare index vacuum stats */
319  indstats = (PVIndStats *) shm_toc_allocate(pcxt->toc, est_indstats_len);
320  MemSet(indstats, 0, est_indstats_len);
321  for (int i = 0; i < nindexes; i++)
322  {
323  Relation indrel = indrels[i];
324  uint8 vacoptions = indrel->rd_indam->amparallelvacuumoptions;
325 
326  /*
327  * Cleanup option should be either disabled, always performing in
328  * parallel or conditionally performing in parallel.
329  */
330  Assert(((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) == 0) ||
331  ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) == 0));
332  Assert(vacoptions <= VACUUM_OPTION_MAX_VALID_VALUE);
333 
334  if (!will_parallel_vacuum[i])
335  continue;
336 
337  if (indrel->rd_indam->amusemaintenanceworkmem)
338  nindexes_mwm++;
339 
340  /*
341  * Remember the number of indexes that support parallel operation for
342  * each phase.
343  */
344  if ((vacoptions & VACUUM_OPTION_PARALLEL_BULKDEL) != 0)
346  if ((vacoptions & VACUUM_OPTION_PARALLEL_CLEANUP) != 0)
348  if ((vacoptions & VACUUM_OPTION_PARALLEL_COND_CLEANUP) != 0)
350  }
352  pvs->indstats = indstats;
353 
354  /* Prepare shared information */
355  shared = (PVShared *) shm_toc_allocate(pcxt->toc, est_shared_len);
356  MemSet(shared, 0, est_shared_len);
357  shared->relid = RelationGetRelid(rel);
358  shared->elevel = elevel;
360  (nindexes_mwm > 0) ?
361  maintenance_work_mem / Min(parallel_workers, nindexes_mwm) :
363 
364  pg_atomic_init_u32(&(shared->cost_balance), 0);
365  pg_atomic_init_u32(&(shared->active_nworkers), 0);
366  pg_atomic_init_u32(&(shared->idx), 0);
367 
369  pvs->shared = shared;
370 
371  /* Prepare the dead_items space */
372  dead_items = (VacDeadItems *) shm_toc_allocate(pcxt->toc,
373  est_dead_items_len);
374  dead_items->max_items = max_items;
375  dead_items->num_items = 0;
376  MemSet(dead_items->items, 0, sizeof(ItemPointerData) * max_items);
378  pvs->dead_items = dead_items;
379 
380  /*
381  * Allocate space for each worker's BufferUsage and WalUsage; no need to
382  * initialize
383  */
384  buffer_usage = shm_toc_allocate(pcxt->toc,
385  mul_size(sizeof(BufferUsage), pcxt->nworkers));
387  pvs->buffer_usage = buffer_usage;
388  wal_usage = shm_toc_allocate(pcxt->toc,
389  mul_size(sizeof(WalUsage), pcxt->nworkers));
391  pvs->wal_usage = wal_usage;
392 
393  /* Store query string for workers */
394  if (debug_query_string)
395  {
396  char *sharedquery;
397 
398  sharedquery = (char *) shm_toc_allocate(pcxt->toc, querylen + 1);
399  memcpy(sharedquery, debug_query_string, querylen + 1);
400  sharedquery[querylen] = '\0';
401  shm_toc_insert(pcxt->toc,
402  PARALLEL_VACUUM_KEY_QUERY_TEXT, sharedquery);
403  }
404 
405  /* Success -- return parallel vacuum state */
406  return pvs;
407 }
static void pg_atomic_init_u32(volatile pg_atomic_uint32 *ptr, uint32 val)
Definition: atomics.h:218
void InitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:203
ParallelContext * CreateParallelContext(const char *library_name, const char *function_name, int nworkers)
Definition: parallel.c:165
#define MemSet(start, val, len)
Definition: c.h:998
size_t Size
Definition: c.h:541
int maintenance_work_mem
Definition: globals.c:127
const char * debug_query_string
Definition: postgres.c:82
#define RelationGetRelid(relation)
Definition: rel.h:501
void shm_toc_insert(shm_toc *toc, uint64 key, void *address)
Definition: shm_toc.c:171
void * shm_toc_allocate(shm_toc *toc, Size nbytes)
Definition: shm_toc.c:88
#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:519
bool amusemaintenanceworkmem
Definition: amapi.h:246
pg_atomic_uint32 cost_balance
int maintenance_work_mem_worker
pg_atomic_uint32 active_nworkers
pg_atomic_uint32 idx
shm_toc_estimator estimator
Definition: parallel.h:42
shm_toc * toc
Definition: parallel.h:45
BufferAccessStrategy bstrategy
BufferUsage * buffer_usage
ItemPointerData items[FLEXIBLE_ARRAY_MEMBER]
Definition: vacuum.h:247
int max_items
Definition: vacuum.h:243
int num_items
Definition: vacuum.h:244
Size vac_max_items_to_alloc_size(int max_items)
Definition: vacuum.c:2343
#define VACUUM_OPTION_MAX_VALID_VALUE
Definition: vacuum.h:65
static int parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested, bool *will_parallel_vacuum)
#define PARALLEL_VACUUM_KEY_INDEX_STATS
#define PARALLEL_VACUUM_KEY_QUERY_TEXT
#define PARALLEL_VACUUM_KEY_BUFFER_USAGE
#define PARALLEL_VACUUM_KEY_SHARED
#define PARALLEL_VACUUM_KEY_WAL_USAGE
struct PVShared PVShared
#define PARALLEL_VACUUM_KEY_DEAD_ITEMS
void EnterParallelMode(void)
Definition: xact.c:1032

References PVShared::active_nworkers, IndexAmRoutine::amparallelvacuumoptions, IndexAmRoutine::amusemaintenanceworkmem, Assert(), ParallelVacuumState::bstrategy, ParallelVacuumState::buffer_usage, PVShared::cost_balance, CreateParallelContext(), ParallelVacuumState::dead_items, debug_query_string, PVShared::elevel, EnterParallelMode(), ParallelContext::estimator, i, PVShared::idx, ParallelVacuumState::indrels, ParallelVacuumState::indstats, InitializeParallelDSM(), VacDeadItems::items, maintenance_work_mem, PVShared::maintenance_work_mem_worker, VacDeadItems::max_items, MemSet, Min, mul_size(), ParallelVacuumState::nindexes, ParallelVacuumState::nindexes_parallel_bulkdel, ParallelVacuumState::nindexes_parallel_cleanup, ParallelVacuumState::nindexes_parallel_condcleanup, VacDeadItems::num_items, ParallelContext::nworkers, palloc0(), parallel_vacuum_compute_workers(), PARALLEL_VACUUM_KEY_BUFFER_USAGE, PARALLEL_VACUUM_KEY_DEAD_ITEMS, PARALLEL_VACUUM_KEY_INDEX_STATS, PARALLEL_VACUUM_KEY_QUERY_TEXT, PARALLEL_VACUUM_KEY_SHARED, PARALLEL_VACUUM_KEY_WAL_USAGE, ParallelVacuumState::pcxt, pfree(), pg_atomic_init_u32(), RelationData::rd_indam, RelationGetRelid, PVShared::relid, ParallelVacuumState::shared, shm_toc_allocate(), shm_toc_estimate_chunk, shm_toc_estimate_keys, shm_toc_insert(), ParallelContext::toc, vac_max_items_to_alloc_size(), VACUUM_OPTION_MAX_VALID_VALUE, VACUUM_OPTION_PARALLEL_BULKDEL, VACUUM_OPTION_PARALLEL_CLEANUP, VACUUM_OPTION_PARALLEL_COND_CLEANUP, ParallelVacuumState::wal_usage, and ParallelVacuumState::will_parallel_vacuum.

Referenced by dead_items_alloc().

◆ parallel_vacuum_main()

void parallel_vacuum_main ( dsm_segment seg,
shm_toc toc 
)

Definition at line 936 of file vacuumparallel.c.

937 {
939  Relation rel;
940  Relation *indrels;
941  PVIndStats *indstats;
942  PVShared *shared;
943  VacDeadItems *dead_items;
944  BufferUsage *buffer_usage;
945  WalUsage *wal_usage;
946  int nindexes;
947  char *sharedquery;
948  ErrorContextCallback errcallback;
949 
950  /*
951  * A parallel vacuum worker must have only PROC_IN_VACUUM flag since we
952  * don't support parallel vacuum for autovacuum as of now.
953  */
955 
956  elog(DEBUG1, "starting parallel vacuum worker");
957 
958  shared = (PVShared *) shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_SHARED, false);
959 
960  /* Set debug_query_string for individual workers */
961  sharedquery = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_QUERY_TEXT, true);
962  debug_query_string = sharedquery;
964 
965  /*
966  * Open table. The lock mode is the same as the leader process. It's
967  * okay because the lock mode does not conflict among the parallel
968  * workers.
969  */
970  rel = table_open(shared->relid, ShareUpdateExclusiveLock);
971 
972  /*
973  * Open all indexes. indrels are sorted in order by OID, which should be
974  * matched to the leader's one.
975  */
976  vac_open_indexes(rel, RowExclusiveLock, &nindexes, &indrels);
977  Assert(nindexes > 0);
978 
979  if (shared->maintenance_work_mem_worker > 0)
981 
982  /* Set index statistics */
983  indstats = (PVIndStats *) shm_toc_lookup(toc,
985  false);
986 
987  /* Set dead_items space */
988  dead_items = (VacDeadItems *) shm_toc_lookup(toc,
990  false);
991 
992  /* Set cost-based vacuum delay */
994  VacuumCostBalance = 0;
995  VacuumPageHit = 0;
996  VacuumPageMiss = 0;
997  VacuumPageDirty = 0;
1001 
1002  /* Set parallel vacuum state */
1003  pvs.indrels = indrels;
1004  pvs.nindexes = nindexes;
1005  pvs.indstats = indstats;
1006  pvs.shared = shared;
1007  pvs.dead_items = dead_items;
1010 
1011  /* These fields will be filled during index vacuum or cleanup */
1012  pvs.indname = NULL;
1014 
1015  /* Each parallel VACUUM worker gets its own access strategy */
1017 
1018  /* Setup error traceback support for ereport() */
1020  errcallback.arg = &pvs;
1021  errcallback.previous = error_context_stack;
1022  error_context_stack = &errcallback;
1023 
1024  /* Prepare to track buffer usage during parallel execution */
1026 
1027  /* Process indexes to perform vacuum/cleanup */
1029 
1030  /* Report buffer/WAL usage during parallel execution */
1031  buffer_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_BUFFER_USAGE, false);
1032  wal_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_WAL_USAGE, false);
1034  &wal_usage[ParallelWorkerNumber]);
1035 
1036  /* Pop the error context stack */
1037  error_context_stack = errcallback.previous;
1038 
1039  vac_close_indexes(nindexes, indrels, RowExclusiveLock);
1042 }
int ParallelWorkerNumber
Definition: parallel.c:113
void pgstat_report_activity(BackendState state, const char *cmd_str)
@ STATE_RUNNING
@ BAS_VACUUM
Definition: bufmgr.h:33
ErrorContextCallback * error_context_stack
Definition: elog.c:94
#define DEBUG1
Definition: elog.h:26
BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype)
Definition: freelist.c:541
void FreeAccessStrategy(BufferAccessStrategy strategy)
Definition: freelist.c:596
int64 VacuumPageHit
Definition: globals.c:148
int64 VacuumPageMiss
Definition: globals.c:149
bool VacuumCostActive
Definition: globals.c:153
int64 VacuumPageDirty
Definition: globals.c:150
int VacuumCostBalance
Definition: globals.c:152
double VacuumCostDelay
Definition: globals.c:146
void InstrEndParallelQuery(BufferUsage *bufusage, WalUsage *walusage)
Definition: instrument.c:208
void InstrStartParallelQuery(void)
Definition: instrument.c:200
#define ShareUpdateExclusiveLock
Definition: lockdefs.h:39
#define RowExclusiveLock
Definition: lockdefs.h:38
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3327
char * pstrdup(const char *in)
Definition: mcxt.c:1392
#define PROC_IN_VACUUM
Definition: proc.h:57
#define RelationGetRelationName(relation)
Definition: rel.h:535
#define RelationGetNamespace(relation)
Definition: rel.h:542
void * shm_toc_lookup(shm_toc *toc, uint64 key, bool noError)
Definition: shm_toc.c:232
PGPROC * MyProc
Definition: proc.c:68
struct ErrorContextCallback * previous
Definition: elog.h:234
void(* callback)(void *arg)
Definition: elog.h:235
uint8 statusFlags
Definition: proc.h:229
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40
pg_atomic_uint32 * VacuumActiveNWorkers
Definition: vacuum.c:84
void vac_open_indexes(Relation relation, LOCKMODE lockmode, int *nindexes, Relation **Irel)
Definition: vacuum.c:2114
int VacuumCostBalanceLocal
Definition: vacuum.c:85
void vac_close_indexes(int nindexes, Relation *Irel, LOCKMODE lockmode)
Definition: vacuum.c:2157
pg_atomic_uint32 * VacuumSharedCostBalance
Definition: vacuum.c:83
static void parallel_vacuum_error_callback(void *arg)
static void parallel_vacuum_process_safe_indexes(ParallelVacuumState *pvs)

References PVShared::active_nworkers, ErrorContextCallback::arg, Assert(), BAS_VACUUM, ParallelVacuumState::bstrategy, ErrorContextCallback::callback, PVShared::cost_balance, ParallelVacuumState::dead_items, DEBUG1, debug_query_string, elog(), error_context_stack, FreeAccessStrategy(), get_namespace_name(), GetAccessStrategy(), ParallelVacuumState::indname, ParallelVacuumState::indrels, ParallelVacuumState::indstats, InstrEndParallelQuery(), InstrStartParallelQuery(), maintenance_work_mem, PVShared::maintenance_work_mem_worker, MyProc, ParallelVacuumState::nindexes, PARALLEL_INDVAC_STATUS_INITIAL, parallel_vacuum_error_callback(), PARALLEL_VACUUM_KEY_BUFFER_USAGE, PARALLEL_VACUUM_KEY_DEAD_ITEMS, PARALLEL_VACUUM_KEY_INDEX_STATS, PARALLEL_VACUUM_KEY_QUERY_TEXT, PARALLEL_VACUUM_KEY_SHARED, PARALLEL_VACUUM_KEY_WAL_USAGE, parallel_vacuum_process_safe_indexes(), ParallelWorkerNumber, pgstat_report_activity(), ErrorContextCallback::previous, PROC_IN_VACUUM, pstrdup(), RelationGetNamespace, RelationGetRelationName, PVShared::relid, ParallelVacuumState::relname, ParallelVacuumState::relnamespace, RowExclusiveLock, ParallelVacuumState::shared, ShareUpdateExclusiveLock, shm_toc_lookup(), STATE_RUNNING, ParallelVacuumState::status, PGPROC::statusFlags, table_close(), table_open(), vac_close_indexes(), vac_open_indexes(), VacuumActiveNWorkers, VacuumCostActive, VacuumCostBalance, VacuumCostBalanceLocal, VacuumCostDelay, VacuumPageDirty, VacuumPageHit, VacuumPageMiss, and VacuumSharedCostBalance.

◆ parallel_vacuum_process_all_indexes()

static void parallel_vacuum_process_all_indexes ( ParallelVacuumState pvs,
int  num_index_scans,
bool  vacuum 
)
static

Definition at line 566 of file vacuumparallel.c.

568 {
569  int nworkers;
570  PVIndVacStatus new_status;
571 
573 
574  if (vacuum)
575  {
577 
578  /* Determine the number of parallel workers to launch */
579  nworkers = pvs->nindexes_parallel_bulkdel;
580  }
581  else
582  {
584 
585  /* Determine the number of parallel workers to launch */
586  nworkers = pvs->nindexes_parallel_cleanup;
587 
588  /* Add conditionally parallel-aware indexes if in the first time call */
589  if (num_index_scans == 0)
590  nworkers += pvs->nindexes_parallel_condcleanup;
591  }
592 
593  /* The leader process will participate */
594  nworkers--;
595 
596  /*
597  * It is possible that parallel context is initialized with fewer workers
598  * than the number of indexes that need a separate worker in the current
599  * phase, so we need to consider it. See
600  * parallel_vacuum_compute_workers().
601  */
602  nworkers = Min(nworkers, pvs->pcxt->nworkers);
603 
604  /*
605  * Set index vacuum status and mark whether parallel vacuum worker can
606  * process it.
607  */
608  for (int i = 0; i < pvs->nindexes; i++)
609  {
610  PVIndStats *indstats = &(pvs->indstats[i]);
611 
613  indstats->status = new_status;
614  indstats->parallel_workers_can_process =
615  (pvs->will_parallel_vacuum[i] &&
617  num_index_scans,
618  vacuum));
619  }
620 
621  /* Reset the parallel index processing counter */
622  pg_atomic_write_u32(&(pvs->shared->idx), 0);
623 
624  /* Setup the shared cost-based vacuum delay and launch workers */
625  if (nworkers > 0)
626  {
627  /* Reinitialize parallel context to relaunch parallel workers */
628  if (num_index_scans > 0)
630 
631  /*
632  * Set up shared cost balance and the number of active workers for
633  * vacuum delay. We need to do this before launching workers as
634  * otherwise, they might not see the updated values for these
635  * parameters.
636  */
639 
640  /*
641  * The number of workers can vary between bulkdelete and cleanup
642  * phase.
643  */
644  ReinitializeParallelWorkers(pvs->pcxt, nworkers);
645 
647 
648  if (pvs->pcxt->nworkers_launched > 0)
649  {
650  /*
651  * Reset the local cost values for leader backend as we have
652  * already accumulated the remaining balance of heap.
653  */
654  VacuumCostBalance = 0;
656 
657  /* Enable shared cost balance for leader backend */
660  }
661 
662  if (vacuum)
663  ereport(pvs->shared->elevel,
664  (errmsg(ngettext("launched %d parallel vacuum worker for index vacuuming (planned: %d)",
665  "launched %d parallel vacuum workers for index vacuuming (planned: %d)",
666  pvs->pcxt->nworkers_launched),
667  pvs->pcxt->nworkers_launched, nworkers)));
668  else
669  ereport(pvs->shared->elevel,
670  (errmsg(ngettext("launched %d parallel vacuum worker for index cleanup (planned: %d)",
671  "launched %d parallel vacuum workers for index cleanup (planned: %d)",
672  pvs->pcxt->nworkers_launched),
673  pvs->pcxt->nworkers_launched, nworkers)));
674  }
675 
676  /* Vacuum the indexes that can be processed by only leader process */
678 
679  /*
680  * Join as a parallel worker. The leader vacuums alone processes all
681  * parallel-safe indexes in the case where no workers are launched.
682  */
684 
685  /*
686  * Next, accumulate buffer and WAL usage. (This must wait for the workers
687  * to finish, or we might get incomplete data.)
688  */
689  if (nworkers > 0)
690  {
691  /* Wait for all vacuum workers to finish */
693 
694  for (int i = 0; i < pvs->pcxt->nworkers_launched; i++)
696  }
697 
698  /*
699  * Reset all index status back to initial (while checking that we have
700  * vacuumed all indexes).
701  */
702  for (int i = 0; i < pvs->nindexes; i++)
703  {
704  PVIndStats *indstats = &(pvs->indstats[i]);
705 
706  if (indstats->status != PARALLEL_INDVAC_STATUS_COMPLETED)
707  elog(ERROR, "parallel index vacuum on index \"%s\" is not completed",
709 
711  }
712 
713  /*
714  * Carry the shared balance value to heap scan and disable shared costing
715  */
717  {
720  VacuumActiveNWorkers = NULL;
721  }
722 }
static void pg_atomic_write_u32(volatile pg_atomic_uint32 *ptr, uint32 val)
Definition: atomics.h:253
static uint32 pg_atomic_read_u32(volatile pg_atomic_uint32 *ptr)
Definition: atomics.h:236
void WaitForParallelWorkersToFinish(ParallelContext *pcxt)
Definition: parallel.c:773
void LaunchParallelWorkers(ParallelContext *pcxt)
Definition: parallel.c:550
void ReinitializeParallelDSM(ParallelContext *pcxt)
Definition: parallel.c:486
void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch)
Definition: parallel.c:536
#define ngettext(s, p, n)
Definition: c.h:1165
int errmsg(const char *fmt,...)
Definition: elog.c:906
#define ERROR
Definition: elog.h:35
#define ereport(elevel,...)
Definition: elog.h:145
void InstrAccumParallelQuery(BufferUsage *bufusage, WalUsage *walusage)
Definition: instrument.c:218
bool parallel_workers_can_process
PVIndVacStatus status
int nworkers_launched
Definition: parallel.h:38
static bool parallel_vacuum_index_is_parallel_safe(Relation indrel, int num_index_scans, bool vacuum)
static void parallel_vacuum_process_unsafe_indexes(ParallelVacuumState *pvs)

References PVShared::active_nworkers, Assert(), ParallelVacuumState::buffer_usage, PVShared::cost_balance, PVShared::elevel, elog(), ereport, errmsg(), ERROR, i, PVShared::idx, ParallelVacuumState::indrels, ParallelVacuumState::indstats, InstrAccumParallelQuery(), IsParallelWorker, LaunchParallelWorkers(), Min, ngettext, ParallelVacuumState::nindexes, ParallelVacuumState::nindexes_parallel_bulkdel, ParallelVacuumState::nindexes_parallel_cleanup, ParallelVacuumState::nindexes_parallel_condcleanup, ParallelContext::nworkers, ParallelContext::nworkers_launched, PARALLEL_INDVAC_STATUS_COMPLETED, PARALLEL_INDVAC_STATUS_INITIAL, PARALLEL_INDVAC_STATUS_NEED_BULKDELETE, PARALLEL_INDVAC_STATUS_NEED_CLEANUP, parallel_vacuum_index_is_parallel_safe(), parallel_vacuum_process_safe_indexes(), parallel_vacuum_process_unsafe_indexes(), PVIndStats::parallel_workers_can_process, ParallelVacuumState::pcxt, pg_atomic_read_u32(), pg_atomic_write_u32(), ReinitializeParallelDSM(), ReinitializeParallelWorkers(), RelationGetRelationName, ParallelVacuumState::shared, PVIndStats::status, vacuum(), VacuumActiveNWorkers, VacuumCostBalance, VacuumCostBalanceLocal, VacuumSharedCostBalance, WaitForParallelWorkersToFinish(), ParallelVacuumState::wal_usage, and ParallelVacuumState::will_parallel_vacuum.

Referenced by parallel_vacuum_bulkdel_all_indexes(), and parallel_vacuum_cleanup_all_indexes().

◆ parallel_vacuum_process_one_index()

static void parallel_vacuum_process_one_index ( ParallelVacuumState pvs,
Relation  indrel,
PVIndStats indstats 
)
static

Definition at line 820 of file vacuumparallel.c.

822 {
823  IndexBulkDeleteResult *istat = NULL;
824  IndexBulkDeleteResult *istat_res;
825  IndexVacuumInfo ivinfo;
826 
827  /*
828  * Update the pointer to the corresponding bulk-deletion result if someone
829  * has already updated it
830  */
831  if (indstats->istat_updated)
832  istat = &(indstats->istat);
833 
834  ivinfo.index = indrel;
835  ivinfo.analyze_only = false;
836  ivinfo.report_progress = false;
837  ivinfo.message_level = DEBUG2;
838  ivinfo.estimated_count = pvs->shared->estimated_count;
839  ivinfo.num_heap_tuples = pvs->shared->reltuples;
840  ivinfo.strategy = pvs->bstrategy;
841 
842  /* Update error traceback information */
843  pvs->indname = pstrdup(RelationGetRelationName(indrel));
844  pvs->status = indstats->status;
845 
846  switch (indstats->status)
847  {
849  istat_res = vac_bulkdel_one_index(&ivinfo, istat, pvs->dead_items);
850  break;
852  istat_res = vac_cleanup_one_index(&ivinfo, istat);
853  break;
854  default:
855  elog(ERROR, "unexpected parallel vacuum index status %d for index \"%s\"",
856  indstats->status,
857  RelationGetRelationName(indrel));
858  }
859 
860  /*
861  * Copy the index bulk-deletion result returned from ambulkdelete and
862  * amvacuumcleanup to the DSM segment if it's the first cycle because they
863  * allocate locally and it's possible that an index will be vacuumed by a
864  * different vacuum process the next cycle. Copying the result normally
865  * happens only the first time an index is vacuumed. For any additional
866  * vacuum pass, we directly point to the result on the DSM segment and
867  * pass it to vacuum index APIs so that workers can update it directly.
868  *
869  * Since all vacuum workers write the bulk-deletion result at different
870  * slots we can write them without locking.
871  */
872  if (!indstats->istat_updated && istat_res != NULL)
873  {
874  memcpy(&(indstats->istat), istat_res, sizeof(IndexBulkDeleteResult));
875  indstats->istat_updated = true;
876 
877  /* Free the locally-allocated bulk-deletion result */
878  pfree(istat_res);
879  }
880 
881  /*
882  * Update the status to completed. No need to lock here since each worker
883  * touches different indexes.
884  */
886 
887  /* Reset error traceback information */
889  pfree(pvs->indname);
890  pvs->indname = NULL;
891 }
#define DEBUG2
Definition: elog.h:25
Relation index
Definition: genam.h:46
double num_heap_tuples
Definition: genam.h:51
bool analyze_only
Definition: genam.h:47
BufferAccessStrategy strategy
Definition: genam.h:52
bool report_progress
Definition: genam.h:48
int message_level
Definition: genam.h:50
bool estimated_count
Definition: genam.h:49
IndexBulkDeleteResult * vac_bulkdel_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat, VacDeadItems *dead_items)
Definition: vacuum.c:2297
IndexBulkDeleteResult * vac_cleanup_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)
Definition: vacuum.c:2318

References IndexVacuumInfo::analyze_only, ParallelVacuumState::bstrategy, ParallelVacuumState::dead_items, DEBUG2, elog(), ERROR, PVShared::estimated_count, IndexVacuumInfo::estimated_count, IndexVacuumInfo::index, ParallelVacuumState::indname, PVIndStats::istat, PVIndStats::istat_updated, IndexVacuumInfo::message_level, IndexVacuumInfo::num_heap_tuples, PARALLEL_INDVAC_STATUS_COMPLETED, PARALLEL_INDVAC_STATUS_NEED_BULKDELETE, PARALLEL_INDVAC_STATUS_NEED_CLEANUP, pfree(), pstrdup(), RelationGetRelationName, PVShared::reltuples, IndexVacuumInfo::report_progress, ParallelVacuumState::shared, PVIndStats::status, ParallelVacuumState::status, IndexVacuumInfo::strategy, vac_bulkdel_one_index(), and vac_cleanup_one_index().

Referenced by parallel_vacuum_process_safe_indexes(), and parallel_vacuum_process_unsafe_indexes().

◆ parallel_vacuum_process_safe_indexes()

static void parallel_vacuum_process_safe_indexes ( ParallelVacuumState pvs)
static

Definition at line 729 of file vacuumparallel.c.

730 {
731  /*
732  * Increment the active worker count if we are able to launch any worker.
733  */
736 
737  /* Loop until all indexes are vacuumed */
738  for (;;)
739  {
740  int idx;
741  PVIndStats *indstats;
742 
743  /* Get an index number to process */
744  idx = pg_atomic_fetch_add_u32(&(pvs->shared->idx), 1);
745 
746  /* Done for all indexes? */
747  if (idx >= pvs->nindexes)
748  break;
749 
750  indstats = &(pvs->indstats[idx]);
751 
752  /*
753  * Skip vacuuming index that is unsafe for workers or has an
754  * unsuitable target for parallel index vacuum (this is vacuumed in
755  * parallel_vacuum_process_unsafe_indexes() by the leader).
756  */
757  if (!indstats->parallel_workers_can_process)
758  continue;
759 
760  /* Do vacuum or cleanup of the index */
761  parallel_vacuum_process_one_index(pvs, pvs->indrels[idx], indstats);
762  }
763 
764  /*
765  * We have completed the index vacuum so decrement the active worker
766  * count.
767  */
770 }
Datum idx(PG_FUNCTION_ARGS)
Definition: _int_op.c:259
static uint32 pg_atomic_sub_fetch_u32(volatile pg_atomic_uint32 *ptr, int32 sub_)
Definition: atomics.h:396
static uint32 pg_atomic_fetch_add_u32(volatile pg_atomic_uint32 *ptr, int32 add_)
Definition: atomics.h:323
static uint32 pg_atomic_add_fetch_u32(volatile pg_atomic_uint32 *ptr, int32 add_)
Definition: atomics.h:381
static void parallel_vacuum_process_one_index(ParallelVacuumState *pvs, Relation indrel, PVIndStats *indstats)

References idx(), PVShared::idx, ParallelVacuumState::indrels, ParallelVacuumState::indstats, ParallelVacuumState::nindexes, parallel_vacuum_process_one_index(), PVIndStats::parallel_workers_can_process, pg_atomic_add_fetch_u32(), pg_atomic_fetch_add_u32(), pg_atomic_sub_fetch_u32(), ParallelVacuumState::shared, and VacuumActiveNWorkers.

Referenced by parallel_vacuum_main(), and parallel_vacuum_process_all_indexes().

◆ parallel_vacuum_process_unsafe_indexes()

static void parallel_vacuum_process_unsafe_indexes ( ParallelVacuumState pvs)
static

Definition at line 783 of file vacuumparallel.c.

784 {
786 
787  /*
788  * Increment the active worker count if we are able to launch any worker.
789  */
792 
793  for (int i = 0; i < pvs->nindexes; i++)
794  {
795  PVIndStats *indstats = &(pvs->indstats[i]);
796 
797  /* Skip, indexes that are safe for workers */
798  if (indstats->parallel_workers_can_process)
799  continue;
800 
801  /* Do vacuum or cleanup of the index */
802  parallel_vacuum_process_one_index(pvs, pvs->indrels[i], indstats);
803  }
804 
805  /*
806  * We have completed the index vacuum so decrement the active worker
807  * count.
808  */
811 }

References Assert(), i, ParallelVacuumState::indrels, ParallelVacuumState::indstats, IsParallelWorker, ParallelVacuumState::nindexes, parallel_vacuum_process_one_index(), PVIndStats::parallel_workers_can_process, pg_atomic_add_fetch_u32(), pg_atomic_sub_fetch_u32(), and VacuumActiveNWorkers.

Referenced by parallel_vacuum_process_all_indexes().