RE: Memory Leak due to CMS

Mr Matt,

Thanks for the response.Our server is running using sun SDK 1.4.2, is
there any tool to find memory leaks in this case.

Thanks,
Sukesh Shetty

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Matthew David
Booth
Sent: Friday, February 18, 2005 5:31 PM
To: [email protected]
Subject: RE: [redhat-ccm-list] Memory Leak due to CMS

On Fri, 2005-02-18 at 17:06 +0530, Sukesh Shetty wrote:
> Mr David Matthew,
Matt ;)

>=20
> Thanks for the response.I downloaded HeapWizard.jar but I'm not able=20
> to debug the source of the memory leak.We are using tomcat server for=20
> our application and due to memory leak problem we are rebooting our=20
> server every alternate days.
> Can you please give some guidelines regarding how to use HeapWizard.

IBM has excellent documentation. You'll need to look up the specifics
yourself, but in short:

You must obviously use the IBM JDK.
Set the environment variable IBM_HEAPDUMP=3Dtrue When your server runs ou=
t
of memory, it will create a file containing the heap dump. It should
tell you about this in one of your log files (wherever stderr goes,
probably).
Find the HeapRoots tool (http://www.alphaworks.ibm.com/tech/heaproots)
to analyze this file.
It is also possible to signal the JVM to generate a heapdump immediately
without exiting.

Look for large, similar allocations of memory, probably attached to a
single structure. Chances are that even if there is more than one memory
leak that one is by far the biggest at the time you get OOM.

Matt

>=20
> Thanks,
> Sukesh Shetty
>=20
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Matthew David

> Booth
> Sent: Friday, February 18, 2005 3:46 PM
> To: [email protected]
> Subject: RE: [redhat-ccm-list] Memory Leak due to CMS
>=20
> Hmm, I don't think we've fixed any memory leaks since 1.0.1. Using=20
> source is unlikely to be a problem.
>=20
> I would very much appreciate it if you were able to debug the source=20
> of the memory leak. Some tools we've found helpful in the past have=20
> been the heapdump feature of IBM jdks
> (http://www-1.ibm.com/support/docview.wss?uid=3Dswg24004782) and java=20
> debugging tools such as OptimizeIt. In practise, heapdump has been the

> most useful. If you can show me a section of heap which grows and what

> it contains, I should be able to fix the problem.
>=20
> Matt
>=20
> On Fri, 2005-02-18 at 15:20 +0530, Sukesh Shetty wrote:
> > Mr Matt,
> > Thanks for the response, yes we are using latest version of aplaws=20
> > ie "aplaws-plus-src-1.0.1".
> > Is using source instead of rpm creating this problem?
> >=20
> > Thanks,
> > Sukesh Shetty
> >=20
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of Matthew=20
> > David
>=20
> > Booth
> > Sent: Friday, February 18, 2005 2:46 PM
> > To: [email protected]
> > Subject: Re: [redhat-ccm-list] Memory Leak due to CMS
> >=20
> > Have you tried running CMS and WAF from APLAWS
> (aplaws.sourceforge.net).
> > We've fixed a couple of memory leak bugs in there, and it could be=20
> > that your problem has been fixed.
> >=20
> > Matt
> >=20
> > On Fri, 2005-02-18 at 12:36 +0530, Sukesh Shetty wrote:
> > > Hi All,
> > >=20
> > > We are using CMS 6.1 & WAF 6.1.
> > > Our server has 1GB of RAM & is used only to run the cms=20
> > > application.Problem is whenever we publish,unpublish & create new=20
> > > articles in content-section there seems to be a memory leak & the=20
> > > RAM usage increases upto 900 GB.After some time we get "out of=20
> > > memory exception" and the application stops.Restarting of CMS also

> > > doesn't help ,we have to reboot the system to get back the used=20
> > > memory.Is this
> >=20
> > > a bug in CMS or have we missed any configuration.
> > > Any help regarding this issue will be greatly appreciated.
> > >=20
> > > Thanking in Advance,
> > > Sukesh Shetty
> > >=20
> >=20
> > --
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