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Re: test_fsync on MinGW(win32)

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Hiroshi Saito <z-saito(at)guitar(dot)ocn(dot)ne(dot)jp>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: test_fsync on MinGW(win32)
Date: 2006-10-13 14:19:27
Message-ID: 200610131419.k9DEJR324334@momjian.us (view raw or flat)
Thread:
Lists: pgsql-patches
Patch applied.  Thanks.

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


Hiroshi Saito wrote:
> Hi.
> 
> I wanted to see this difference. It is somewhat ad hoc.
> However, It is more effective than it doesn't show it at all.
> 
> -- MinGW(win32) --
> $ test_fsync
> Simple write timing:
>         write                    3.644000
> 
> Compare fsync times on write() and non-write() descriptor:
> (If the times are similar, fsync() can sync data written
>  on a different descriptor.)
>         write, fsync, close     40.543000
>         write, close, fsync     47.033000
> 
> Compare one o_sync write to two:
>         (o_sync unavailable)  
>         open o_dsync, write      0.094000
> 
>         (fdatasync unavailable)
>         write, fsync,           26.700000
> 
> Compare file sync methods with 2 8k writes:
>         open o_dsync, write      0.203000
>         (fdatasync unavailable)
>         write, fsync,           27.920000
> 
> 
> Regards,
> Hiroshi Saito
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-- 
  Bruce Momjian   bruce(at)momjian(dot)us
  EnterpriseDB    http://www.enterprisedb.com

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