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Re: [PATCHES] WAL: O_DIRECT and multipage-writer (+ memory leak)

From: Mark Wong <markw(at)osdl(dot)org>
To: ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>
Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-patches(at)postgresql(dot)org
Subject: Re: [PATCHES] WAL: O_DIRECT and multipage-writer (+ memory leak)
Date: 2005-03-01 21:53:10
Message-ID: 20050301215310.GD2115@osdl.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
On Thu, Feb 03, 2005 at 07:25:55PM +0900, ITAGAKI Takahiro wrote:
> Hello everyone.
> 
> I fixed two bugs in the patch that I sent before.
> Check and test new one, please.

Ok, finally got back into the office and was able to run 1 set of
tests.

So the new baseline result with 8.0.1:
        http://www.osdl.org/projects/dbt2dev/results/dev4-010/309/
        Throughput: 3639.97

Results with the patch but open_direct not set:
        http://www.osdl.org/projects/dbt2dev/results/dev4-010/308/
        Throughput: 3494.72

Results with the patch and open_direct set:
        http://www.osdl.org/projects/dbt2dev/results/dev4-010/312/
        Throughput: 3489.69

You can verify that the wall_sync_method is set to open_direct under
the "database parameters" link, but I'm wondering if I missed
something.  It looks a little odd the the performance dropped.

Mark

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