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Restructure autovacuum in two processes: a dummy process, which runs

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continuously, and requests vacuum runs of "autovacuum workers" to postmaster.
The workers do the actual vacuum work.  This allows for future improvements,
like allowing multiple autovacuum jobs running in parallel.

For now, the code keeps the original behavior of having a single autovac
process at any time by sleeping until the previous worker has finished.
This commit is contained in:
Alvaro Herrera
2007-02-15 23:23:23 +00:00
parent eecbb33267
commit 1820650934
16 changed files with 807 additions and 250 deletions
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14
src/backend/postmaster/pgstat.c
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@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.146 2007/02/09 16:12:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.147 2007/02/15 23:23:23 alvherre Exp $
* ----------
*/
#include "postgres.h"
@ -930,7 +930,7 @@ pgstat_report_vacuum(Oid tableoid, bool shared,
msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
msg.m_tableoid = tableoid;
msg.m_analyze = analyze;
msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
msg.m_autovacuum = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
msg.m_vacuumtime = GetCurrentTimestamp();
msg.m_tuples = tuples;
pgstat_send(&msg, sizeof(msg));
@ -955,7 +955,7 @@ pgstat_report_analyze(Oid tableoid, bool shared, PgStat_Counter livetuples,
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
msg.m_tableoid = tableoid;
msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
msg.m_autovacuum = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
msg.m_analyzetime = GetCurrentTimestamp();
msg.m_live_tuples = livetuples;
msg.m_dead_tuples = deadtuples;
@ -2280,8 +2280,8 @@ backend_read_statsfile(void)
return;
Assert(!pgStatRunningInCollector);
/* Autovacuum wants stats about all databases */
if (IsAutoVacuumProcess())
/* Autovacuum launcher wants stats about all databases */
if (IsAutoVacuumLauncherProcess())
pgStatDBHash = pgstat_read_statsfile(InvalidOid);
else
pgStatDBHash = pgstat_read_statsfile(MyDatabaseId);
@ -2319,8 +2319,8 @@ pgstat_setup_memcxt(void)
void
pgstat_clear_snapshot(void)
{
/* In an autovacuum process we keep the stats forever */
if (IsAutoVacuumProcess())
/* In an autovacuum worker process we keep the stats forever */
if (IsAutoVacuumWorkerProcess())
return;
/* Release memory, if any was allocated */