From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@postgresql.org, Josh Berkus <josh@agliodbs.com>
Cc: Greg Smith <greg@2ndquadrant.com>
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
Date: Tue, 16 Nov 2010 19:51:28 -0500
Message-ID: <10822.1289955088@sss.pgh.pa.us> (raw)
In-Reply-To: <201011170130.10720.andres@anarazel.de>
References: <AANLkTi=n3zxiLNFhbpiN=JPQPwB=BhXf9iepw1KOEs8U@mail.gmail.com>
<4CE312D9.6030503@agliodbs.com>
<9058.1289950294@sss.pgh.pa.us>
<201011170130.10720.andres@anarazel.de>
Andres Freund <andres@anarazel.de> writes:
> On Wednesday 17 November 2010 00:31:34 Tom Lane wrote:
>> Well, we're not going to increase the default to gigabytes
> Especially not as I don't think it will have any effect after wal_segment_size
> as that will force a write-out anyway. Or am I misremembering the
> implementation?
Well, there's a forced fsync after writing the last page of an xlog
file, but I don't believe that proves that more than 16MB of xlog
buffers is useless. Other processes could still be busy filling the
buffers.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, andres@anarazel.de, josh@agliodbs.com, greg@2ndquadrant.com
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
In-Reply-To: <10822.1289955088@sss.pgh.pa.us>
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