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Add wait event for the group commit delay before WAL flush

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Author: Rafia Sabih <rafia.pghackers@gmail.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Discussion: https://www.postgresql.org/message-id/CA%2BFpmFf-hWXtrC0Q3Cr_Xo78zuP_M_VC5xgWPOYOkwqOD0T8eg@mail.gmail.com
This commit is contained in:
Heikki Linnakangas
2025-12-09 17:06:40 +02:00
parent f231a4e8c7
commit 3cb5808bd1
2 changed files with 3 additions and 0 deletions
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2
src/backend/access/transam/xlog.c
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@@ -2884,7 +2884,9 @@ XLogFlush(XLogRecPtr record)
if (CommitDelay > 0 && enableFsync &&
MinimumActiveBackends(CommitSiblings))
{
pgstat_report_wait_start(WAIT_EVENT_COMMIT_DELAY);
pg_usleep(CommitDelay);
pgstat_report_wait_end();
/*
* Re-check how far we can now flush the WAL. It's generally not

1
src/backend/utils/activity/wait_event_names.txt
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@@ -175,6 +175,7 @@ Section: ClassName - WaitEventTimeout
BASE_BACKUP_THROTTLE "Waiting during base backup when throttling activity."
CHECKPOINT_WRITE_DELAY "Waiting between writes while performing a checkpoint."
COMMIT_DELAY "Waiting for commit delay before WAL flush."
PG_SLEEP "Waiting due to a call to <function>pg_sleep</function> or a sibling function."
RECOVERY_APPLY_DELAY "Waiting to apply WAL during recovery because of a delay setting."
RECOVERY_RETRIEVE_RETRY_INTERVAL "Waiting during recovery when WAL data is not available from any source (<filename>pg_wal</filename>, archive or stream)."