Re: Configuring fdatasync for Solaris2

> Date: Wed, 12 Sep 2001 14:19:09 +0200 (CEST)
> From: Peter Eisentraut <peter_e@gmx.net>
> To: Kenji Sugita <sugita@sra.co.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@gmx.net   http://funkturm.homeip.net/~peter


Kenji Sugita
sugita@sra.co.jp