Re: wal sync method - Mailing list pgsql-performance

From Bruce Momjian
Subject Re: wal sync method
Date
Msg-id 200602280114.k1S1EAQ17159@candle.pha.pa.us
Whole thread Raw
In response to Re: wal sync method  (Javier Somoza <jsomoza@pandasoftware.es>)
Responses Re: wal sync method
List pgsql-performance
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@pandasoftware.es
>
> Panda Software
> Buenos Aires, 12
> 48001 BILBAO - ESPA?A
> Tel?fono: 902 24 365 4
> Fax:  94 424 46 97
> http://www.pandasoftware.es
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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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