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Teach pgstat_vacuum_stat to not bother scanning pg_proc in the common case 

where no function stats entries exist.  Partial response to Pavel's
observation that small VACUUM operations are noticeably slower in CVS HEAD
than 8.3.
This commit is contained in:
Tom Lane 2008-12-08 15:44:54 +00:00
parent bd33aca36e
commit 4e0b63b0b9
1 changed files with 41 additions and 36 deletions
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77
src/backend/postmaster/pgstat.c
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@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2008, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.184 2008/11/04 11:04:06 petere Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.185 2008/12/08 15:44:54 tgl Exp $
* ----------
*/
#include "postgres.h"
@ -967,55 +967,60 @@ pgstat_vacuum_stat(void)
hash_destroy(htab);
/*
* Now repeat the above steps for functions.
* Now repeat the above steps for functions. However, we needn't bother
* in the common case where no function stats are being collected.
*/
htab = pgstat_collect_oids(ProcedureRelationId);
pgstat_setheader(&f_msg.m_hdr, PGSTAT_MTYPE_FUNCPURGE);
f_msg.m_databaseid = MyDatabaseId;
f_msg.m_nentries = 0;
hash_seq_init(&hstat, dbentry->functions);
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&hstat)) != NULL)
if (dbentry->functions != NULL &&
hash_get_num_entries(dbentry->functions) > 0)
{
Oid funcid = funcentry->functionid;
htab = pgstat_collect_oids(ProcedureRelationId);
CHECK_FOR_INTERRUPTS();
pgstat_setheader(&f_msg.m_hdr, PGSTAT_MTYPE_FUNCPURGE);
f_msg.m_databaseid = MyDatabaseId;
f_msg.m_nentries = 0;
if (hash_search(htab, (void *) &funcid, HASH_FIND, NULL) != NULL)
continue;
hash_seq_init(&hstat, dbentry->functions);
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&hstat)) != NULL)
{
Oid funcid = funcentry->functionid;
CHECK_FOR_INTERRUPTS();
if (hash_search(htab, (void *) &funcid, HASH_FIND, NULL) != NULL)
continue;
/*
* Not there, so add this function's Oid to the message
*/
f_msg.m_functionid[f_msg.m_nentries++] = funcid;
/*
* If the message is full, send it out and reinitialize to empty
*/
if (f_msg.m_nentries >= PGSTAT_NUM_FUNCPURGE)
{
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
+f_msg.m_nentries * sizeof(Oid);
pgstat_send(&f_msg, len);
f_msg.m_nentries = 0;
}
}
/*
* Not there, so add this function's Oid to the message
* Send the rest
*/
f_msg.m_functionid[f_msg.m_nentries++] = funcid;
/*
* If the message is full, send it out and reinitialize to empty
*/
if (f_msg.m_nentries >= PGSTAT_NUM_FUNCPURGE)
if (f_msg.m_nentries > 0)
{
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
+f_msg.m_nentries * sizeof(Oid);
pgstat_send(&f_msg, len);
f_msg.m_nentries = 0;
}
hash_destroy(htab);
}
/*
* Send the rest
*/
if (f_msg.m_nentries > 0)
{
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
+f_msg.m_nentries * sizeof(Oid);
pgstat_send(&f_msg, len);
}
hash_destroy(htab);
}