| Lists: | pgsql-patches |
|---|
| From: | "Hiroshi Saito" <z-saito(at)guitar(dot)ocn(dot)ne(dot)jp> |
|---|---|
| To: | <pgsql-patches(at)postgresql(dot)org> |
| Subject: | test_fsync on MinGW(win32) |
| Date: | 2006-10-12 16:29:52 |
| Message-ID: | 063c01c6ee1b$a4d15df0$a543040a@wiseknot.local |
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| Lists: | pgsql-patches |
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
| Attachment | Content-Type | Size |
|---|---|---|
| test_fsync_patch | application/octet-stream | 3.3 KB |
| 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 |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| 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
[ Attachment, skipping... ]
>
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--
Bruce Momjian bruce(at)momjian(dot)us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +