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help / color / mirror / Atom feedFrom: Bernd Helmle <[email protected]>
To: Tom Lane <[email protected]>
Cc: Kevin Grittner <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: [email protected]
Subject: Re: no universally correct setting for fsync
Date: Sat, 08 May 2010 02:16:23 +0200
Message-ID: <D9EB8B28CCC10C46B7DD3472@amenophis> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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--On 7. Mai 2010 19:49:15 -0400 Tom Lane <[email protected]> wrote:
> Bernd Helmle <[email protected]> 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).
>
Well, yes, BBU present and proven storage. Maybe i'm wrong, but it seems
battery backed write caches aren't that seldom even in low end systems
nowadays.
--
Thanks
Bernd
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Subject: Re: no universally correct setting for fsync
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