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Add some test scaffolding to allow cache-flush stress testing (and I do

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mean stress ... system is orders of magnitude slower with this enabled).
This commit is contained in:
Tom Lane 2006-01-19 21:49:30 +00:00
parent 36cdb24f31
commit 337cc41236
1 changed files with 31 additions and 1 deletions
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32
src/backend/utils/cache/inval.c vendored
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@ -80,7 +80,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/inval.c,v 1.73.2.1 2005/11/22 18:23:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/inval.c,v 1.73.2.2 2006/01/19 21:49:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -625,6 +625,36 @@ AcceptInvalidationMessages(void)
{
ReceiveSharedInvalidMessages(LocalExecuteInvalidationMessage,
InvalidateSystemCaches);
/*
* Test code to force cache flushes anytime a flush could happen.
*
* If used with CLOBBER_FREED_MEMORY, CLOBBER_CACHE_ALWAYS provides a
* fairly thorough test that the system contains no cache-flush hazards.
* However, it also makes the system unbelievably slow --- the regression
* tests take about 100 times longer than normal.
*
* If you're a glutton for punishment, try CLOBBER_CACHE_RECURSIVELY.
* This slows things by at least a factor of 10000, so I wouldn't suggest
* trying to run the entire regression tests that way. It's useful to
* try a few simple tests, to make sure that cache reload isn't subject
* to internal cache-flush hazards, but after you've done a few thousand
* recursive reloads it's unlikely you'll learn more.
*/
#if defined(CLOBBER_CACHE_ALWAYS)
{
static bool in_recursion = false;
if (!in_recursion)
{
in_recursion = true;
InvalidateSystemCaches();
in_recursion = false;
}
}
#elif defined(CLOBBER_CACHE_RECURSIVELY)
InvalidateSystemCaches();
#endif
}
/*