Apache Tomcat crash on 6.1

[Martijn Veening]

Hi Kurt, thnx for suggestions,

Indeed it seems that java process memory increases, although the reading
is different from the tomcat manager reading. The size started at 450M
(res 100M) and after 6 hours increased to 600M (res 160M). I can imagine
that if that continues another 10 hours, the 1 Gb limit is reached
causing crash.
Tomcat however read lower memory-usage, but that will be memory within
the JVM-reserved memory, which differs from the process-memory in
FreeBSD (I presume).

Could it be a memory leak ? Or is this increase normal because it
contains cached memory which can be freed when nescessary ?

And where could I see the diagnostic message for the malloc() function ?

Martijn Veening
www.detrics.com



On Wed, 2006-07-05 at 21:03, Kurt Miller wrote:

> Hi Martijn,
> 
> On Wednesday 05 July 2006 2:09 pm, Martijn Veening wrote:
> > Thanks Kurt, but an out-of-memory error seems unlikely, it's a
> > SuperMicro server with 1 Gb of memory and 256 Mb dedicated to the JVM
> > (by JVM startup-options in catalina.sh).
> 
> Some ideas:
> 1) check your datasize ulimit for the login class of the user
> tomcat is running under.
> 2) set the X malloc() option (ln -s X /etc/malloc.conf) and
> see if you get a diagnostic message as to why malloc() is
> returning NULL.
> 3) watch the java process memory utilization over time with
> top or ps -l and look for increasing memory usage.
> 
> > I added the JVM-parameter -XX:+UseMembar now, but i understand that the
> > diablo-1.5.0_7 has this turned on by default, so that probably doesn't
> > help
> 
> Correct
> 
> > (the server hasn't crashed since though, but is only up for 10 
> > hours, so not conclusive).
> > 
> > It is a 2-processor machine though: does that require tuning ?
> 
> Nothing in particular comes to mind, but you could look through
> some of Sun's docs at http://java.sun.com/docs/hotspot/index.html
> 
> Regards,
> -Kurt
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