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 20:04:28 -0500
Message-ID: <11113.1289955868@sss.pgh.pa.us> (raw)
In-Reply-To: <201011170201.24782.andres@anarazel.de>
References: <AANLkTi=n3zxiLNFhbpiN=JPQPwB=BhXf9iepw1KOEs8U@mail.gmail.com>
<201011170130.10720.andres@anarazel.de>
<10822.1289955088@sss.pgh.pa.us>
<201011170201.24782.andres@anarazel.de>
Andres Freund <andres@anarazel.de> writes:
> On Wednesday 17 November 2010 01:51:28 Tom Lane wrote:
>> 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.
> Maybe I am missing something, but I think the relevant AdvanceXLInsertBuffer()
> is currently called with WALInsertLock held?
The fsync is associated with the write, which is not done with insert
lock held. We're not quite that dumb.
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: <11113.1289955868@sss.pgh.pa.us>
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