[TriLUG] ulimit violations

[Josh Vickery]

If you are getting an "OutOfMemoryException" I believe it is not a
ulimit problem, but a JVM problem, as T.Bryan states.

On 7/14/05, John Berninger <johnw at berningeronline.net> wrote:
> On Thu, 14 Jul 2005, Timothy A. Chagnon wrote:
> 
> > I have a mis-behaving Tomcat webapp (that I didn't write) which likes to
> > increase its memory size from ~80M on startup to ~125M after some amount
> > of usage at which point it crashes with OutOfMemoryException.  Obviously
> > the devs need to fix whatever memory they're leaking or filehandles
> > they've left open so that the thing is actually scalable.
> >
> > What I'd like to know though, is if I can find a log file or other hook
> > where I can see if it's hitting a ulimit and which one.  The 125M
> > doesn't seem to correlate to any of the set ones (default RHEL3, iirc),
> > so it could be any or none of them really:
> >
> > $ ulimit -a
> > core file size        (blocks, -c) 0
> > data seg size         (kbytes, -d) unlimited
> > file size             (blocks, -f) unlimited
> > max locked memory     (kbytes, -l) 4
> > max memory size       (kbytes, -m) unlimited
> > open files                    (-n) 1024
> > pipe size          (512 bytes, -p) 8
> > stack size            (kbytes, -s) 10240
> > cpu time             (seconds, -t) unlimited
> > max user processes            (-u) 7168
> > virtual memory        (kbytes, -v) unlimited
> 
>         ulimits can also be set in startup scripts - and quite often
> are, especially for apache and tomcat.  Check the /etc/init.d scripts
> for tomcat and apache for modified ulimit values.  Capturing sysrq
> information every <foo> seconds might help as well, too, but make sure
> you've got a decent amount of space to spool the sysrq's to.  It's text,
> but it can add up.
> 
> 
> --
> John Berninger
> 
> GPG Key ID: A8C1D45C
>         Fingerprint: B1BB 90CB 5314 3113 CF22  66AE 822D 42A8 A8C1 D45C
> 
> Ita erat quando hic adveni.
> --
> --
> TriLUG mailing list        : http://www.trilug.org/mailman/listinfo/trilug
> TriLUG Organizational FAQ  : http://trilug.org/faq/
> TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
> TriLUG PGP Keyring         : http://trilug.org/~chrish/trilug.asc
>