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From "Surendrakumar Viswanathan -X (suviswan - HCL at Cisco)" <suvis...@cisco.com>
Subject RE: Tomcat Runs OutOfMemory (Not at repeated WAR deployments)
Date Fri, 04 Jul 2008 04:56:59 GMT
Hi 
  Add  -XX:+HeapDumpOnOutOfMemoryError option to you JVM parameter. It
will dump the heap (in hprof format) on OOM. You can take the hprof file
and then analyze using Eclipse MAT (Memory Analyzer tool). This will
give you information on which objects are getting used most. Based on
that you can find out the corresponding application code and check
whether there are memory leak exists in the code.
  The random slowness is usually associated with GC. Enable verboseGC
with timestamp option and then check whether the GC is happening at the
corresponding time of slowness.

Suren

> -----Original Message-----
> From: Maduranga [mailto:maduranga@gmail.com] 
> Sent: Friday, July 04, 2008 3:22 AM
> To: Tomcat Users List
> Subject: Re: Tomcat Runs OutOfMemory (Not at repeated WAR deployments)
> 
> Its 32 bit. Sorry I missed that earlier.
> 
> Could be a problem with web app. Could you give me an 
> idea/example for a profiler? Any open source ones available?
> 
> I am really in a tight schedule to get this sorted out. All 
> the help much appreciated Thanks a lot
> 
> Maduranga
> 
> 
> On Thu, Jul 3, 2008 at 6:13 PM, Caldarale, Charles R 
> <Chuck.Caldarale@unisys.com> wrote:
> >> From: Maduranga [mailto:maduranga@gmail.com]
> >> Subject: Re: Tomcat Runs OutOfMemory (Not at repeated WAR 
> >> deployments)
> >>
> >> OS: Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
> >
> > Is that 64-bit or 32-bit?
> >
> >> I have 2G ram for JVM, but I would like to stick with 1G if its 
> >> possible.
> >
> > If that's 2G for the entire JVM process, the maximum heap 
> you can get away with would be somewhere around 1.5G, since 
> there's a fair amount of space needed for code, libraries, 
> file space, etc.
> >
> >> Do you recommend upgrading to Tomcat 6?
> >
> > Might have some benefit, but you really need to run a 
> profiler to find out what's consuming the memory.  The 
> problem is likely to like with your webapp, not Tomcat itself.
> >
> >  - Chuck
> >
> >
> > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR 
> OTHERWISE PROPRIETARY MATERIAL and is thus for use only by 
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> >
> > 
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> 
> 
> 
> --
> Maduranga
> 
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