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Re: WAL: O_DIRECT and multipage-writer

From: ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>
To: Mark Wong <markw(at)osdl(dot)org>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: WAL: O_DIRECT and multipage-writer
Date: 2005-03-23 04:55:46
Message-ID: 20050323134912.387C.ITAGAKI.TAKAHIRO@lab.ntt.co.jp (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
Hi, Mark.

Mark Wong <markw(at)osdl(dot)org> wrote:

> In light of this thread, have you compared the performance on
> Linux-2.4?

No, but I'm just testing my patch on Linux-2.4 with a middle-range server.
I will report the results sometime soon.


By the way, I found the debug option (XLOG_MULTIPAGE_WRITER_DEBUG) was enabled
in your prior benchmarks. It writes logs a lot.
I hope performance doesn't fall at least without debug.

> So the new baseline result with 8.0.1:
>         Throughput: 3639.97
> Results with the patch but open_direct not set:
>         Throughput: 3494.72
> Results with the patch and open_direct set:
>         Throughput: 3489.69

---
ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>
NTT Cyber Space Laboratories


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