Re: Advice configuring ServeRAID 8k for performance

From: Greg Smith <greg(at)2ndquadrant(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Scott Carey <scott(at)richrelevance(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Kenneth Cox <kenstir(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Advice configuring ServeRAID 8k for performance
Date: 2010-08-16 20:54:19
Message-ID: 4C69A57B.80605@2ndquadrant.com
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Andres Freund wrote:
> A new checkpointing logic + a new syncing logic
> (prepare_fsync() earlier and then fsync() later) would be a nice
> thing. Do you plan to work on that?
>

The background writer already caches fsync calls into a queue, so the
prepare step you're thinking needs to be there is already. The problem
is that the actual fsync calls happen in a tight loop. That we're busy
fixing.

--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.us

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