Re: [HACKERS] posmaster failed under high load

On Wed, 5 May 1999, Bruce Momjian wrote:

> Date: Wed, 5 May 1999 11:17:27 -0400 (EDT)
> From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
> To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
> Cc: Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, hackers(at)postgreSQL(dot)org
> Subject: Re: [HACKERS] posmaster failed under high load
>
> > Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> writes:
> > > That's why I noticed 10 or more (postmaster) processes, which eventually
> > > gone after 30-40 minutes.
> >
> > Could those be new backends that have been forked off the main
> > postmaster, but haven't yet gotten around to changing their ps info?
> > I'm not sure what would block a new backend for many minutes before
> > it did that, however. Can you attach to one of these processes with
> > a debugger and get a backtrace to show what it's doing?
>
> I can't imagine what they would be waiting for, but it seems like a good
> guess.
>

After more than 1 hour postmaster processes still running
76 ? S 0:00 postmaster -i -B 1024 -S -D/usr/local/pgsql/data/ -o -Fe
651 ? SW 0:00 (postmaster)
693 ? SW 0:00 (postmaster)
694 ? SW 0:00 (postmaster)
698 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
699 ? SW 0:00 (postmaster)
700 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
701 ? SW 0:00 (postmaster)
702 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
18:48[om]:/usr/local/etc/httpd/conf>psg post

76 ? S 0:00 postmaster -i -B 1024 -S -D/usr/local/pgsql/data/ -o -Fe
651 ? SW 0:00 (postmaster)
693 ? SW 0:00 (postmaster)
694 ? SW 0:00 (postmaster)
698 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
699 ? SW 0:00 (postmaster)
700 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
701 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
702 ? S 0:00 /usr/local/pgsql/bin/postgres localhost httpd apod idle
19:30[om]:/usr/local/etc/httpd/conf>

It's interesting, that process with pid 701 migrates from
(postmaster) to postgres with normal ps output !
It seems postgres lives with his own life :-)

regards,
Oleg

>
> --
> Bruce Momjian | http://www.op.net/~candle
> maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
>

_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83