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Re: Load distributed checkpoint

From: Martijn van Oosterhout <kleptog(at)svana(dot)org>
To: Takayuki Tsunakawa <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>
Cc: ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>,pgsql-hackers(at)postgresql(dot)org
Subject: Re: Load distributed checkpoint
Date: 2006-12-20 11:17:05
Message-ID: 20061220111705.GB12639@svana.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
On Wed, Dec 20, 2006 at 08:10:56PM +0900, Takayuki Tsunakawa wrote:
> One question is the disk utilization.  While bgwriter is fsync()ing,
> %util of WAL disk drops to almost 0.  But the the bandwidth of
> Ultra320 SCSI does not appear to be used fully.  Any idea?

That implies that fsyncing a datafile blocks fsyncing the WAL. That
seems terribly unlikely (although...). What OS/Kernel/Filesystem is
this. I note a sync bug in linux for ext3 that may have relevence.

Have a nice day,

-- 
Martijn van Oosterhout   <kleptog(at)svana(dot)org>   http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.

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