[mod_python] remnant 'orphan' apache subprocesses

Are CGI scripts used anywhere at all on your Apache web site?

On 22/01/2008, Alec Matusis <matusis at yahoo.com> wrote:
> > What version of Apache are you using?
>
> 2.2.6
>
> > What Python web application are you running on top of mod_python, a
> > self built one or one that uses one of the larger web frameworks?
>
> Only self-built stuff, nothing complicated.
>
> > Does your application create sub processes in any way to perform
> > additional work?
>
> No sub processes and no threads, except that we use MySQLdb module (which
> might create threads?).
>
> I noticed a warning in the error log:
> /live/scripts/_pro.py:100: Warning: Rows matched: 1  Changed: 1  Warnings: 1
> (this is a mysql warning), but I would not think this is relevant...
>
>
> > -----Original Message-----
> > From: Graham Dumpleton [mailto:graham.dumpleton at gmail.com]
> > Sent: Monday, January 21, 2008 9:22 PM
> > To: Alec Matusis
> > Cc: mod_python at modpython.org
> > Subject: Re: [mod_python] remnant 'orphan' apache subprocesses
> >
> > What version of Apache are you using?
> >
> > What Python web application are you running on top of mod_python, a
> > self built one or one that uses one of the larger web frameworks?
> >
> > Does your application create sub processes in any way to perform
> > additional work?
> >
> > Graham
> >
> > On 22/01/2008, Alec Matusis <matusis at yahoo.com> wrote:
> > > I have been investigating a memory leak that occurs on  an apache
> > server
> > > since we switched to worker MPM.
> > > I found that the source of it are apache subprocesses that lose track
> > of
> > > their parent and never exit:
> > >
> > > root at web10 ~> ps -ef | grep httpd
> > > root     16197     1  0 02:00 ?        00:00:09
> > > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start
> > > nobody   17750     1  0 17:53 ?        00:00:00
> > > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start
> > > nobody    5112 16197  4 20:02 ?        00:00:16
> > > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start
> > > nobody    5159 16197  4 20:02 ?        00:00:15
> > > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start
> > > nobody    5300 16197  4 20:03 ?        00:00:14
> > > /usr/local/encap/httpd/bin/httpd -f /p2/web/conf/web10.conf -k start
> > >
> > >
> > > in this output, apache child pid 17750 has pid 1 as a parent, and it
> > is one
> > > of those 'zombie children'.
> > > Pids 5112,  5159, 5300 were normal (parent is pid 16197), and they
> > exited
> > > after MaxRequestsPerChild was reached.
> > >
> > > Does anybody have any advice on this? I cannot correlate this to
> > anything,
> > > there's nothing interesting in the server error log.
> > > These 'zombies' appear at a rate of 2-3 per day; this apache serves
> > about
> > > 350 requests per second.
> > >
> > > This Apache configuration is
> > >
> > > ServerLimit 40
> > > ThreadLimit 70
> > >
> > > StartServers 10
> > > MaxClients 1600
> > > MinSpareThreads 75
> > > MaxSpareThreads 200
> > > ThreadsPerChild 40
> > > MaxRequestsPerChild 10000
> > >
> > >
> > >
> > >
> > >
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> > >
>
>