From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Dirk Lutzebäck <lutzeb(at)aeccom(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Toooo many context switches (maybe SLES8?) |
Date: | 2004-04-15 16:38:33 |
Message-ID: | 407EBA89.6080007@joeconway.com |
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Lists: | pgsql-performance |
Dirk Lutzebäck wrote:
> Joe, do you know where I should look in the 7.4.2 code to find this out?
I think I was wrong. I just looked in CVS and found the commit I was
thinking about:
http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/lmgr/s_lock.c.diff?r1=1.22&r2=1.23
http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/storage/s_lock.h.diff?r1=1.123&r2=1.124
=========================
Revision 1.23 / (download) - [select for diffs] , Sat Dec 27 20:58:58
2003 UTC (3 months, 2 weeks ago) by tgl
Changes since 1.22: +5 -1 lines
Diff to previous 1.22
Improve spinlock code for recent x86 processors: insert a PAUSE
instruction in the s_lock() wait loop, and use test before test-and-set
in TAS() macro to avoid unnecessary bus traffic. Patch from Manfred
Spraul, reworked a bit by Tom.
=========================
I thought this had been committed to the 7.4 stable branch as well, but
it appears not.
Joe
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