From efbe674e4ed3f2f36f3d8e9cd20f9ef90a3ebcd5 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Thu, 19 Jan 2006 21:49:21 +0000 Subject: [PATCH] Add some test scaffolding to allow cache-flush stress testing (and I do mean stress ... system is orders of magnitude slower with this enabled). --- src/backend/utils/cache/inval.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/src/backend/utils/cache/inval.c b/src/backend/utils/cache/inval.c index 437bd4b086..ba2be48d1a 100644 --- a/src/backend/utils/cache/inval.c +++ b/src/backend/utils/cache/inval.c @@ -80,7 +80,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/cache/inval.c,v 1.74 2005/11/22 18:17:24 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/utils/cache/inval.c,v 1.75 2006/01/19 21:49:21 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 } /* -- 2.40.0