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Re: testing HS/SR - 1 vs 2 performance

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Erik Rijkers <er(at)xs4all(dot)nl>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: testing HS/SR - 1 vs 2 performance
Date: 2010-04-22 22:45:47
Message-ID: 1271976347.4161.61.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-hackers 
On Thu, 2010-04-22 at 20:39 +0200, Erik Rijkers wrote:
> On Sun, April 18, 2010 13:01, Simon Riggs wrote:

> any comment is welcome...

Please can you re-run with -l and post me the file of times

Please also rebuild using --enable-profile so we can see what's
happening.

Can you also try the enclosed patch which implements prefetching during
replay of btree delete records. (Need to set effective_io_concurrency)

Thanks for your further help.

-- 
 Simon Riggs           www.2ndQuadrant.com
Attachment: xlog_prefetch.patch
Description: text/x-patch (5.1 KB)

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Subject: Re: testing HS/SR - 1 vs 2 performance

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