From: | Alfred Perlstein <bright(at)wintelcom(dot)net> |
---|---|
To: | Philip Warner <pjw(at)rhyme(dot)com(dot)au> |
Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Performance monitor signal handler |
Date: | 2001-03-13 14:59:48 |
Message-ID: | 20010313065948.V29888@fw.wintelcom.net |
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Lists: | pgsql-hackers |
* Philip Warner <pjw(at)rhyme(dot)com(dot)au> [010313 06:42] wrote:
> >
> >This ought to always give a consistant snapshot of the file to
> >whomever opens it.
> >
>
> I think Tom has previously stated that there are technical reasons not to
> do IO in signal handlers, and I have philosophical problems with
> performance monitors that ask 50 backends to do file IO. I really do think
> shared memory is TWTG.
I wasn't really suggesting any of those courses of action, all I
suggested was using rename(2) to give a seperate appilcation a
consistant snapshot of the stats.
Actually, what makes the most sense (although it may be a performance
killer) is to have the backends update a system table that the external
app can query.
--
-Alfred Perlstein - [bright(at)wintelcom(dot)net|alfred(at)freebsd(dot)org]
Daemon News Magazine in your snail-mail! http://magazine.daemonnews.org/
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