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From: Tom Lane <[email protected]>
To: Bernd Helmle <[email protected]>
Cc: Kevin Grittner <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: [email protected]
Subject: Re: no universally correct setting for fsync
Date: Fri, 07 May 2010 19:49:15 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <A1EBC6E5100210B51612365E@amenophis>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<A1EBC6E5100210B51612365E@amenophis>

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).

			regards, tom lane

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