Re: wal sync method

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Javier Somoza <jsomoza(at)pandasoftware(dot)es>
Cc: Evgeny Gridasov <eugrid(at)fpm(dot)kubsu(dot)ru>, pgsql-performance(at)postgresql(dot)org
Subject: Re: wal sync method
Date: 2006-02-28 01:14:10
Message-ID: 200602280114.k1S1EAQ17159@candle.pha.pa.us
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Use whichever sync method is fastest for you. They are all reliable,
except turning fsync off.

---------------------------------------------------------------------------

Javier Somoza wrote:
>
>
>
> Hi Evgeny
>
> Im also testing what fsync method to use and using this program
> (http://archives.postgresql.org/pgsql-performance/2003-12/msg00191.php)
> a bit modified and i get this results:
>
> write 0.000036
> write & fsync 0.006796
> write & fdatasync 0.001001
> write (O_FSYNC) 0.005761
> write (O_DSYNC) 0.005894
>
> So fdatasync faster for me?
>
>
> > Hi everybody!
> >
> > Which wal sync method is the fastest under linux 2.6.x?
> > I'm using RAID-10 (JFS filesystem), 2xXEON, 4 Gb RAM.
> >
> > I've tried to switch to open_sync which seems to work
> > faster than default fdatasync, but is it crash-safe?
>
>
>
>
> Javier Somoza
> Oficina de Direcci?n Estrat?gica
> mailto:jsomoza(at)pandasoftware(dot)es
>
> Panda Software
> Buenos Aires, 12
> 48001 BILBAO - ESPA?A
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> Fax: 94 424 46 97
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>
>
>
>
>
>
>
>

--
Bruce Momjian http://candle.pha.pa.us
SRA OSS, Inc. http://www.sraoss.com

+ If your life is a hard drive, Christ can be your backup. +

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