Re: Linux 2.2 vs 2.4 for PostgreSQL

[Matthew Kirkwood <matthew@hairy.beasts.org>]

On Wed, 7 Mar 2001, Stephen C. Tweedie wrote:

> > Postgres is fairly fsync-happy.
>
> Do you happen to know if it is using fsync, fdatasync or O_SYNC?  I'm
> seeing performance regressions on 2.4 fsync versus 2.2 which I'm
> chasing right now, but fdatasync doesn't seem to have that problem
> (and fdatasync is always preferable if you are updating a file in
> place and you don't care about the mtime timestamp being 100%
> uptodate).

The version I did these numbers on uses fsync(), but
they have recently changed that to fdatasync() in a
few applicable places.

I don't have that installed on my test machine yet,
but will have a look if it's deemed intersting.

Matthew.

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