From: | Kenji Sugita <sugita(at)sra(dot)co(dot)jp> |
---|---|
To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
Cc: | pgsql-patches(at)postgresql(dot)org |
Subject: | Re: Configuring fdatasync for Solaris2 |
Date: | 2001-09-12 18:07:29 |
Message-ID: | 20010912180730.012F48AB8E@srapc1267.sra.co.jp |
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Lists: | pgsql-patches |
> Date: Wed, 12 Sep 2001 14:19:09 +0200 (CEST)
> From: Peter Eisentraut <peter_e(at)gmx(dot)net>
> To: Kenji Sugita <sugita(at)sra(dot)co(dot)jp>
> Subject: Re: [PATCHES] Configuring fdatasync for Solaris2
>
> > I also cannot find out the rt library on Solaris2. The library posix4 hits
> > fdatasync.
>
> I rechecked the manuals, apparently -lrt was added in a later version
> (after the POSIX.4 group was renamed?). I've changed the test to check
> both libraries.
Thanks a lot.
> Do you have any performance data of the fdatasync method versus the
> default open_datasync method?
I have the data for SPARC 500MHz Solaris2.6 running PostgreSQL 7.1.3.
#clients open_datasync fdatasync (TPC-B, TPS)
======== ============= =========
1 34.867522 47.188265
2 41.457329 57.119142
4 41.854741 62.250403
8 43.103382 63.909396
16 35.890254 62.757908
32 41.421592 52.132258
64 37.325511 51.805046
128 28.906521 37.942672
This table is made by following commands:
pgbench -i -s 10
pgbench -c #clients -t 100
> Peter Eisentraut peter_e(at)gmx(dot)net http://funkturm.homeip.net/~peter
Kenji Sugita
sugita(at)sra(dot)co(dot)jp
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