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From: Simon Riggs <simon@2ndquadrant.com>
To: Jignesh K. Shah <J.K.Shah@Sun.COM>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-performance@postgresql.org
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Subject: Re: CLOG Patch
Date: Fri, 03 Aug 2007 21:29:47 +0100
Message-ID: <1186172987.4136.18.camel@ebony.site> (raw)
In-Reply-To: <46B38B83.1000906@sun.com>
References: <200707190828.59088.josh@agliodbs.com>
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	<46A0FA31.2080208@sun.com>
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On Fri, 2007-08-03 at 16:09 -0400, Jignesh K. Shah wrote:

> This patch seems to work well (both with 32 and 64 value but not with 16 
> and the default 8). 

Could you test at 24 please also? Tom has pointed out the additional
cost of setting this higher, even in workloads that don't benefit from
the I/O-induced contention reduction.

> Is there a way we can integrate this in 8.3?

I just replied to Josh's thread on -hackers about this.

> This will improve out of box performance quite a bit for high number of 
> users (atleat 30% in my OLTP test)

Yes, thats good. Will this have a dramatic effect on a particular
benchmark, or for what reason might we need this? Tom has questioned the
use case here, so I think it would be good to explain a little more for
everyone. Thanks.

-- 
  Simon Riggs
  EnterpriseDB  http://www.enterprisedb.com




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