| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bernd Helmle <mailings(at)oopsware(dot)de> |
| Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: no universally correct setting for fsync |
| Date: | 2010-05-07 23:49:15 |
| Message-ID: | 3860.1273276155@sss.pgh.pa.us |
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| Lists: | pgsql-docs pgsql-hackers |
Bernd Helmle <mailings(at)oopsware(dot)de> writes:
> I've recently even started to wonder if the performance gain with fsync=off
> is still that large on modern hardware. While testing large migration
> procedures to a new version some time ago (on an admitedly fast storage) i
> forgot here and then to turn it off, without a significant degradation in
> performance.
That says to me either that you're using a battery-backed write cache,
or your fsyncs don't really work (no write barriers or something like
that).
regards, tom lane
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