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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Memory Leak
Date Thu, 15 Apr 2004 17:21:58 GMT

Hi,
<sigh />

I and others have explained many times on this list the difference
between task manager (or top command on unix) memory displays and the
java heap parameters and sizing.  The effect of profiling (often an
order of magnitude or more memory increase and CPU time) has also been
discussed.  You can search the archives for more details.


Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Chanan Braunstein [mailto:cbraunstein@knovel.com]
>Sent: Thursday, April 15, 2004 1:04 PM
>To: 'Tomcat Users List'
>Subject: RE: Memory Leak
>
>Another thing I don't understand. When I start up tomcat through the
>services, and in task manager I show the VM Size column, I see that it
is
>about the same size as what I set in the command line:  -server -Xrs
>-Xms356M -Xmx356M. And the crash usually occurs when Mem Usage column
>approaches VM Size. VM Size never grows larger.
>
>However when I ran tomcat under the profiler (OptimizeIt 6) with those
same
>options, my VM size grow much larger, it reached up to 1GB. Also I
finally
>saw the Mem Usage go up and down up to 800,000k and back down the
300,000k
>that I noticed. And tomcat never crashed. So it must be a different
>setting,
>but I don't see what. Although I did notice that in bat file that
Optimize
>It 6 created for me they had:
>
>rem (Optional) Increase the GCOP value if you get some "GCOP buffer too
>small"
>rem errors with the Profiler (size is in Mb)
>set GCOPSIZE=5
>set JAVA_PARAMS=-DGCOPSIZE=%GCOPSIZE%
>
>Anyone knows what that is? Can that be the fix to my problem?
>
>
>Chanan Braunstein
>Knovel Corp.
>Web Development Manager
>607-773-1840 x672
>http://www.knovel.com
>
>
>-----Original Message-----
>From: Chanan Braunstein [mailto:cbraunstein@knovel.com]
>Sent: Thursday, April 15, 2004 12:27 PM
>To: 'Tomcat Users List'
>Subject: RE: Memory Leak
>
>Sun 1.4.2_02 on win2k
>
>
>Chanan Braunstein
>Knovel Corp.
>Web Development Manager
>607-773-1840 x672
>http://www.knovel.com
>
>
>-----Original Message-----
>From: Ralph Einfeldt [mailto:ralph.einfeldt@uptime-isc.de]
>Sent: Thursday, April 15, 2004 11:47 AM
>To: Tomcat Users List
>Subject: RE: Memory Leak
>
>
>Which vm and os do you use ?
>
>That behaviour is jvm and os dependend. (This is the first time I hear
of
>an
>implementation that returns memory to the os, although I knew that it
could
>be done)
>
>> -----Original Message-----
>> From: Allistair Crossley [mailto:Allistair.Crossley@QAS.com]
>> Sent: Thursday, April 15, 2004 5:38 PM
>> To: Tomcat Users List
>> Subject: RE: Memory Leak
>>
>>
>> this is what I have heard before but it is not true. our Tomcat
5.0.19
>> under load in the task manager view goes up to about 150MB and
>> overnight or under light load goes back down to 95MB.
>>
>
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