From 0aafa271ec90dbe494eea79fd484a4856023b3a8 Mon Sep 17 00:00:00 2001 From: Daniil Davidov Date: Sun, 23 Nov 2025 01:07:47 +0700 Subject: [PATCH v17 2/4] Logging for parallel autovacuum --- src/backend/access/heap/vacuumlazy.c | 27 +++++++++++++++++++++++++-- src/backend/commands/vacuumparallel.c | 20 ++++++++++++++------ src/include/commands/vacuum.h | 16 ++++++++++++++-- src/tools/pgindent/typedefs.list | 1 + 4 files changed, 54 insertions(+), 10 deletions(-) diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c index 2086a577199..35d2b07aa8a 100644 --- a/src/backend/access/heap/vacuumlazy.c +++ b/src/backend/access/heap/vacuumlazy.c @@ -349,6 +349,12 @@ typedef struct LVRelState int num_index_scans; int num_dead_items_resets; Size total_dead_items_bytes; + + /* + * Number of planned and actually launched parallel workers for all index + * scans, or NULL + */ + PVWorkersUsage *workers_usage; /* Counters that follow are only for scanned_pages */ int64 tuples_deleted; /* # deleted from table */ int64 tuples_frozen; /* # newly frozen */ @@ -711,6 +717,16 @@ heap_vacuum_rel(Relation rel, const VacuumParams params, indnames = palloc_array(char *, vacrel->nindexes); for (int i = 0; i < vacrel->nindexes; i++) indnames[i] = pstrdup(RelationGetRelationName(vacrel->indrels[i])); + + /* + * Allocate space for workers usage statistics. Thus, we explicitly + * make clear that such statistics must be accumulated. For now, this + * is used only by autovacuum leader worker, because it must log it in + * the end of table processing. + */ + vacrel->workers_usage = AmAutoVacuumWorkerProcess() ? + (PVWorkersUsage *) palloc0(sizeof(PVWorkersUsage)) : + NULL; } /* @@ -1125,6 +1141,11 @@ heap_vacuum_rel(Relation rel, const VacuumParams params, orig_rel_pages == 0 ? 100.0 : 100.0 * vacrel->lpdead_item_pages / orig_rel_pages, vacrel->lpdead_items); + if (vacrel->workers_usage) + appendStringInfo(&buf, + _("parallel index vacuum/cleanup : workers planned = %d, workers launched = %d\n"), + vacrel->workers_usage->nplanned, + vacrel->workers_usage->nlaunched); for (int i = 0; i < vacrel->nindexes; i++) { IndexBulkDeleteResult *istat = vacrel->indstats[i]; @@ -2700,7 +2721,8 @@ lazy_vacuum_all_indexes(LVRelState *vacrel) { /* Outsource everything to parallel variant */ parallel_vacuum_bulkdel_all_indexes(vacrel->pvs, old_live_tuples, - vacrel->num_index_scans); + vacrel->num_index_scans, + vacrel->workers_usage); /* * Do a postcheck to consider applying wraparound failsafe now. Note @@ -3133,7 +3155,8 @@ lazy_cleanup_all_indexes(LVRelState *vacrel) /* Outsource everything to parallel variant */ parallel_vacuum_cleanup_all_indexes(vacrel->pvs, reltuples, vacrel->num_index_scans, - estimated_count); + estimated_count, + vacrel->workers_usage); } /* Reset the progress counters */ diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c index 6a3a00585f9..490f93959d1 100644 --- a/src/backend/commands/vacuumparallel.c +++ b/src/backend/commands/vacuumparallel.c @@ -227,7 +227,7 @@ struct ParallelVacuumState 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); + bool vacuum, PVWorkersUsage *wusage); 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, @@ -502,7 +502,7 @@ parallel_vacuum_reset_dead_items(ParallelVacuumState *pvs) */ void parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tuples, - int num_index_scans) + int num_index_scans, PVWorkersUsage *wusage) { Assert(!IsParallelWorker()); @@ -513,7 +513,7 @@ parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tup pvs->shared->reltuples = num_table_tuples; pvs->shared->estimated_count = true; - parallel_vacuum_process_all_indexes(pvs, num_index_scans, true); + parallel_vacuum_process_all_indexes(pvs, num_index_scans, true, wusage); } /* @@ -521,7 +521,8 @@ parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tup */ void parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tuples, - int num_index_scans, bool estimated_count) + int num_index_scans, bool estimated_count, + PVWorkersUsage *wusage) { Assert(!IsParallelWorker()); @@ -533,7 +534,7 @@ parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tup pvs->shared->reltuples = num_table_tuples; pvs->shared->estimated_count = estimated_count; - parallel_vacuum_process_all_indexes(pvs, num_index_scans, false); + parallel_vacuum_process_all_indexes(pvs, num_index_scans, false, wusage); } /* @@ -618,7 +619,7 @@ parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested, */ static void parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans, - bool vacuum) + bool vacuum, PVWorkersUsage *wusage) { int nworkers; PVIndVacStatus new_status; @@ -742,6 +743,13 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan "launched %d parallel vacuum workers for index cleanup (planned: %d)", pvs->pcxt->nworkers_launched), pvs->pcxt->nworkers_launched, nworkers))); + + /* Remember these values, if we asked to. */ + if (wusage != NULL) + { + wusage->nlaunched += pvs->pcxt->nworkers_launched; + wusage->nplanned += nworkers; + } } /* Vacuum the indexes that can be processed by only leader process */ diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h index e885a4b9c77..ec5d70aacdc 100644 --- a/src/include/commands/vacuum.h +++ b/src/include/commands/vacuum.h @@ -300,6 +300,16 @@ typedef struct VacDeadItemsInfo int64 num_items; /* current # of entries */ } VacDeadItemsInfo; +/* + * PVWorkersUsage stores information about total number of launched and planned + * workers during parallel vacuum. + */ +typedef struct PVWorkersUsage +{ + int nlaunched; + int nplanned; +} PVWorkersUsage; + /* GUC parameters */ extern PGDLLIMPORT int default_statistics_target; /* PGDLLIMPORT for PostGIS */ extern PGDLLIMPORT int vacuum_freeze_min_age; @@ -394,11 +404,13 @@ extern TidStore *parallel_vacuum_get_dead_items(ParallelVacuumState *pvs, extern void parallel_vacuum_reset_dead_items(ParallelVacuumState *pvs); extern void parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tuples, - int num_index_scans); + int num_index_scans, + PVWorkersUsage *wusage); extern void parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tuples, int num_index_scans, - bool estimated_count); + bool estimated_count, + PVWorkersUsage *wusage); extern void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc); /* in commands/analyze.c */ diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list index b9e671fcda8..6e35c6aa493 100644 --- a/src/tools/pgindent/typedefs.list +++ b/src/tools/pgindent/typedefs.list @@ -2397,6 +2397,7 @@ PullFilterOps PushFilter PushFilterOps PushFunction +PVWorkersUsage PyCFunction PyMethodDef PyModuleDef -- 2.43.0