Re: Configuring fdatasync for Solaris2

> 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