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Re: Limiting Memory Use Per Process/User

On 5/4/05, Artur Kokoszka <kokoszka@ite.waw.pl> wrote:
> Stephen Le wrote:
> > On 5/4/05, nodata <debian@nodata.co.uk> wrote:
> >
> >>>I was wondering if there was a way to limit the amount of memory used
> >>>by any single process or user. I'd like to prevent Apache (and other
> >>>server daemons) from consuming all available memory and thrashing my
> >>>disk when everything else is forced to swap.
> >>>
> >>>For example, I'm currently testing the coppermine image gallery
> >>>software. It's written in PHP and uses ImageMagick. Whenever images
> >>>are uploaded to the gallery, it spawns a number of fairly large
> >>>/usb/bin/convert processes under the 'www-data' user name. These
> >>>processes consume all available memory and result in disk thrashing
> >>>that brings my server down to a grinding halt. Is there a way to
> >>>prevent this from happening?
> >>>
> >>
> >>ulimit -a, but that's probably not a good solution for this.
> >
> >
> > ulimit only applies to commands started by the shell. If Apache (or
> > any other daemon) spawns a child process, would ulimit apply to them?
> >
> > I would really like to set a 'max memory usage per user' or 'max
> > memory usage per process' setting.
> >
> Try PAM module:
> http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/pam-6.html#ss6.12

I think the PAM module only applies to commands executed in a shell.
Will they also apply to the server daemons (normally started through
/etc/init.d) and the children they spawn?

--Stephen Le

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