jdrago_999 at yahoo
Jun 16, 2008, 7:23 AM
Post #3 of 4
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--- On Sun, 6/15/08, James Smith <js5 [at] sanger> wrote:
> From: James Smith <js5 [at] sanger>
> Subject: Re: Diagnosing memory usage
> To: "Michael Gardner" <gardnermj [at] gmail>
> Cc: modperl [at] perl
> Date: Sunday, June 15, 2008, 11:13 PM
> Michael - depends on the OS - but you could look at the
> Apache::SizeLimit
> code which allows kills processes when the memory per
> process gets large
> works well for the system we use at work...
>
> If on a unix/linux based system "top" is your
> friend as it will indicate
> the memory usage per process
>
>
> On Sun, 15 Jun 2008, Michael Gardner wrote:
>
> > I've inherited an existing Apache+mod_perl 1.3.x
> server. I am not very
> > experienced with Apache nor mod_perl, so I have to
> pick up things as I go
> > along.
> >
> > Recently I built a new version of Apache (1.3.41) with
> static mod_perl 1.30,
> > and it seems to work. The problem is that every few
> days or so, the server
> > apparently runs out of memory, grinding to a halt and
> necessitating a hard
> > reset.
> >
> > I suspect mod_perl is the primary memory user here,
> since most of the pages
> > we serve are Perl scripts. But I don't know how to
> go about diagnosing the
> > problem, especially since the server gets so bogged
> down when it happens that
> > I can't access it to get info on running
> processes, memory usage, etc. I have
> > noticed that the memory usage of each httpd process
> seems to grow over time,
> > but it's usually very slow growth, and I can't
> tell if that's really a leak
> > or just normal behavior.
> >
> > Workarounds would be helpful, but naturally I'd
> prefer to eliminate the cause
> > of the problem. I've been looking through the
> documentation, but haven't made
> > much progress so far. How can I get to the bottom of
> this?
> >
> > -Michael
>
>
> --
> The Wellcome Trust Sanger Institute is operated by Genome
> Research
> Limited, a charity registered in England with number
> 1021457 and a
> company registered in England with number 2742969, whose
> registered
> office is 215 Euston Road, London, NW1 2BE.
Sounds like the Perl code running under mod_perl (the scripts themselves) are the more likely culprit.
Check out Devel::Cycle on CPAN ( http://search.cpan.org/perldoc?Devel::Cycle ) for more information on that.
Best regards,
John Drago
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