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

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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 * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * 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" #include "utils/portal.h"
/* /*
* estimate of the maximum number of open portals a user would have, * Estimate of the maximum number of open portals a user would have,
* used in initially sizing the PortalHashTable in EnablePortalManager() * 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
/* ---------------- /* ----------------