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Change memory-space accounting mechanism in tuplesort.c and tuplestore.c

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to make a reasonable attempt at accounting for palloc overhead, not just
the requested size of each memory chunk.  Since in many scenarios this
will make for a significant reduction in the amount of space acquired,
partially compensate by doubling the default value of SORT_MEM to 1Mb.
Per discussion in pgsql-general around 9-Jun-2002..
This commit is contained in:
Tom Lane
2002-08-12 00:36:12 +00:00
parent e44beef712
commit 77a7e9968b
10 changed files with 140 additions and 134 deletions
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4
src/backend/utils/misc/guc.c
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@ -5,7 +5,7 @@
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.78 2002/08/07 17:26:24 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.79 2002/08/12 00:36:11 tgl Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -556,7 +556,7 @@ static struct config_int
{
{ "sort_mem", PGC_USERSET }, &SortMem,
512, 4 * BLCKSZ / 1024, INT_MAX, NULL, NULL
1024, 8 * BLCKSZ / 1024, INT_MAX, NULL, NULL
},
{