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From "Manish Bhatnagar" <man...@accord-soft.com>
Subject RE: Tomcat Memory usage(Urgent!)
Date Fri, 08 Mar 2002 11:14:43 GMT
We faced this problem some time back. The memory usage
seemed to increase to the point where no other application
could be started. Many times we had to restart the NT
machine itself. We did a thorough code-review and fixed the
leaks. But even after that the Tomcat memory usage kept on
increasing, although it came down, all of a sudden, to a
very low value (600K). So garbage collection is being done
more frequently, I would say. When there are more users
connected to the Web server and accessing the Servlets/JSPs,
the memory usage keeps on increasing... just to give
numbers... we accessed our Web application using 50+
instances of browsers (IE, Netscape) and the memory shot to
200M. After some time (not immediately) when we stopped
accessing the Web server it came down to 24M. You can find
more pointers on JDC at http://java.sun.com. I remember
discussing this topic there.
Thanks
-mb-

-----Original Message-----
From: david@carrot.hotgen.com
[mailto:david@carrot.hotgen.com]On Behalf
Of David Cassidy
Sent: Friday, March 08, 2002 4:35 PM
To: Tomcat Users List
Subject: Re: Tomcat Memory usage(Urgent!)


within your program you might want to check out

Runtime runtime = Runtime.getRuntime;
runtime.freeMemory() vs
runtime.totalMemory()

This will let you know what it's really using..
But as top says it's only 59M then I'd be looking at
other processes in your ps list

Hope this helps

D



Boily Sylvain wrote:

> hi all ,
>
> Well how is possible to give back memory ? Because after 2
days the
> memory is full.
> thx
>
> Chris Pheby wrote:
>
> >Each of these processes correlates to a /thread/. The
processes are
> sharing
> >memory for the most part - something that ps or top don't
make clear.
> >
> >Chris
> >
> >-----Original Message-----
> >From:
tomcat-user-return-13170-chris=tfe-group.com@jakarta.apache.
org
>
>[mailto:tomcat-user-return-13170-chris=tfe-group.com@jakart
a.apache.org
> ]
> >On Behalf Of Galbayar
> >Sent: 08 March 2002 09:24
> >To: Tomcat Users List
> >Subject: Tomcat Memory usage(Urgent!)
> >
> >
> >Hello all
> >
> >Here is part of top output. Is it usual that java
processes eat all of
> >memory? ? At now there are 50 java processes started that
running
> tomcat and
> >each of them uses 59M memory. There is running apache
server with
> tomcat 4
> >and mysql. OS is Redhat7.2 x86 . JDK 1.4 is installed.
> >
> >Thx
> >
> >106 processes: 105 sleeping, 1 running, 0 zombie, 0
stopped
> >CPU states: 0.3% user, 3.4% system, 0.0% nice, 96.1% idle
> >Mem: 1028860K av, 1022352K used, 6508K free, 116K shrd,
129004K buff
> >Swap: 1020116K av, 0K used, 1020116K free 762320K cached
> >
> >3201 root 9 0 60692 59M 28164 S 0.0 5.8 0:03 java
> >3202 root 8 0 60692 59M 28164 S 0.0 5.8 0:00 java
> >3203 root 9 0 60692 59M 28164 S 0.0 5.8 0:35 java
> >3204 root 9 0 60692 59M 28164 S 0.0 5.8 0:00 java
> >3205 root 9 0 60692 59M 28164 S 0.0 5.8 0:01 java
> >3206 root 9 0 60692 59M 28164 S 0.0 5.8 0:00 java
> >3207 root 9 0 60692 59M 28164 S 0.0 5.8 0:00 java
> >3208 root 9 0 60692 59M 28164 S 0.0 5.8 0:00 java
> >3209 root 9 0 60692 59M 28164 S 0.0 5.8 0:03 java
> >.
> >.
> >.
> >
> >
> >
> >--
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>
> --
>
> */Sylvain Boily/*
> /Administrateur Linux/
>
> <cid:part1.09010406.06040603@lbn.fr>
>
> /*Adresse :* 39, bd Anatole France -  93200 St-Denis -
France/
> /*tel :*0148131814/
> /*mail :*s.boily@lbn.fr <mailto:s.boily@lbn.fr>
> *web:*http://www.linkbynet.fr/


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