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Reduce the default size of the PortalHashTable in order to save a 

few cycles during transaction exit.  A typical session probably
wouldn't have as many as half a dozen portals open at once, so the
original value of 64 seems far larger than needed.
This commit is contained in:
Tom Lane 2004-11-21 22:48:01 +00:00
parent 183e8b911c
commit 7f1711f29d
1 changed files with 7 additions and 4 deletions
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11
src/backend/utils/mmgr/portalmem.c
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.74 2004/10/12 01:50:04 neilc Exp $
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.75 2004/11/21 22:48:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -26,10 +26,13 @@
#include "utils/portal.h"
/*
* estimate of the maximum number of open portals a user would have,
* used in initially sizing the PortalHashTable in EnablePortalManager()
* Estimate of the maximum number of open portals a user would have,
* used in initially sizing the PortalHashTable in EnablePortalManager().
* Since the hash table can expand, there's no need to make this overly
* generous, and keeping it small avoids unnecessary overhead in the
* hash_seq_search() calls executed during transaction end.
*/
#define PORTALS_PER_USER 64
#define PORTALS_PER_USER 16
/* ----------------