Message-ID: <4C69A57B.80605@2ndquadrant.com>
Date: Mon, 16 Aug 2010 16:54:19 -0400
From: Greg Smith <greg@2ndquadrant.com>
User-Agent: Thunderbird 2.0.0.24 (X11/20100317)
MIME-Version: 1.0
To: Andres Freund <andres@anarazel.de>
CC: Scott Carey <scott@richrelevance.com>, Bruce Momjian <bruce@momjian.us>,
	Kenneth Cox <kenstir@gmail.com>,
	"pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Advice configuring ServeRAID 8k for performance
References: <201008131817.o7DIH1b03550@momjian.us>
	<4C6591D9.1080206@2ndquadrant.com>
	<5687A8AD-CA70-4272-A32C-6AE5F491CEA4@richrelevance.com>
	<4C69796D.9000408@2ndquadrant.com>
	<20100816200227.GA3911@anarazel.de>
	<4C699BE2.50606@2ndquadrant.com>
	<20100816201838.GB3911@anarazel.de>
In-Reply-To: <20100816201838.GB3911@anarazel.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

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@2ndQuadrant.com   www.2ndQuadrant.us