From: Greg Smith <gsmith@gregsmith.com>
To: JP Fletcher <jpfletch@ca.afilias.info>
Cc: pgsql-performance@postgresql.org
Subject: Re: Fwd: wal_sync_methods for AIX
Date: Tue, 19 Feb 2008 17:57:21 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0802191754311.22515@westnet.com> (raw)
In-Reply-To: <47BB3A3C.90407@ca.afilias.info>
References: <20080215140453.4fafd9b1@commandprompt.com>
<8B5845E3-6846-4335-888A-4EB94730C0B5@langille.org>
<47BB3A3C.90407@ca.afilias.info>
On Tue, 19 Feb 2008, JP Fletcher wrote:
> Shared buffers are set to 50000, bgwriter settings are as follows:
>
> bgwriter_delay = 50 # 10-10000 milliseconds between
> rounds
> bgwriter_lru_percent = 20.0 # 0-100% of LRU buffers scanned/round
> bgwriter_lru_maxpages = 300 # 0-1000 buffers max written/round
> bgwriter_all_percent = 5 # 0-100% of all buffers scanned/round
> bgwriter_all_maxpages = 600 # 0-1000 buffers max written/round
Not that it impacts what you're asking about, but that's probably an
excessive setting for bgwriter_lru_percent. With the reduced delay and
scanning that much, you're burning a lot of CPU time doing that for little
benefit.
--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD
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To: pgsql-performance@postgresql.org
Cc: gsmith@gregsmith.com, jpfletch@ca.afilias.info
Subject: Re: Fwd: wal_sync_methods for AIX
In-Reply-To: <Pine.GSO.4.64.0802191754311.22515@westnet.com>
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