| From: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 8.4 open item: copy performance regression? |
| Date: | 2009-06-19 15:51:01 |
| Message-ID: | 4A3BB3E5.6000001@kaltenbrunner.cc |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Just eyeing the code ... another thing we changed since 8.3 is to enable
> posix_fadvise() calls for WAL. Any of the complaints want to try diking
> out this bit of code (near line 2580 in src/backend/access/transam/xlog.c)?
>
> #if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
> if (!XLogArchivingActive() &&
> (get_sync_bit(sync_method) & PG_O_DIRECT) == 0)
> (void) posix_fadvise(openLogFile, 0, 0, POSIX_FADV_DONTNEED);
> #endif
doesn't seem to cause any noticable difference for me...
Stefan
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