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Tweak a few of the most heavily used function call points to zero out

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just the significant fields of FunctionCallInfoData, rather than MemSet'ing
the whole struct to zero.  Unused positions in the arg[] array will
thereby contain garbage rather than zeroes.  This buys back some of the
performance hit from increasing FUNC_MAX_ARGS.  Also tweak tuplesort.c
code for more speed by marking some routines 'inline'.  All together
these changes speed up simple sorts, like count(distinct int4column),
by about 25% on a P4 running RH Linux 7.2.
This commit is contained in:
Tom Lane
2002-10-04 17:19:55 +00:00
parent 53c5edace8
commit 3b8ba163d0
3 changed files with 261 additions and 188 deletions
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16
src/backend/executor/nodeAgg.c
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@ -46,7 +46,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.88 2002/09/28 20:00:19 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.89 2002/10/04 17:19:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -275,8 +275,18 @@ advance_transition_function(AggStatePerAgg peraggstate,
}
}
/* OK to call the transition function */
MemSet(&fcinfo, 0, sizeof(fcinfo));
/*
* OK to call the transition function
*
* This is heavily-used code, so manually zero just the necessary fields
* instead of using MemSet(). Compare FunctionCall2().
*/
/* MemSet(&fcinfo, 0, sizeof(fcinfo)); */
fcinfo.context = NULL;
fcinfo.resultinfo = NULL;
fcinfo.isnull = false;
fcinfo.flinfo = &peraggstate->transfn;
fcinfo.nargs = 2;
fcinfo.arg[0] = peraggstate->transValue;