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From Norman Maurer ...@byteaction.de>
Subject Re: james and memoryusage
Date Tue, 20 Jun 2006 13:08:16 GMT
Am Dienstag, den 20.06.2006, 15:02 +0200 schrieb Bernd Fondermann:
> Norman Maurer wrote:
> > Hi guys,
> > 
> > any has ever test the memory usage of james when used in big enviroment
> > and cannot deliver mail. We otice that if we use james and it try to
> > deliver emails is seems that it never release the memory after timeout.
> > So the load and memory usage get bigger with every message which can not
> > get delievert. If we use a stadardgateway for outgoing email and james
> > will so never gt a timout the memoryusage and load keeps constant.
> 
> Its not uncommon for Java VMs to _visibly_ free memory only when really 
> needed. This is totally under the control of the JVM. In real life, when 
> you see constantly growing heap sizes it may or may not be due to 
> unreleased memory or leaks. You can only definitivly say you ran short 
> of memory when you are seeing an OutOfMemory exception. Memory 
> organisation and garbage collection in Java is a science of its own.

Yes thats right but i set -Xmx256M . So it should not use more then
that. But java consumn all of me free 1,8 GB and after that also consumn
2 GB swap. That not normal!

> 
> > Bernd, have you ever tried this in postage ?Anyone else have expirence? 
> 
> Sure, I am tracking memory usage under Postage. If you have any 
> questions concerning that, I'll be happy to answer them.
> 
> Depending on the configuration (repository types) the 'memory 
> fingerprint' of James varies, but not dramatically. Sooner or later, 
> with reasonable load, you run out of memory. Optimisation in this area 
> should be a topic for a future release.
> 
> > We use the current 2.3-branch from svn.
> 
> With high enough load, you run into problems in 2.2 and 2.3.
> 
>    Bernd
> 
Yeah thats right. But i not seen a OOM yet. It only consums all Memory
and setup high load. Thats all!

Here a bit more infos:

Kernel: 2.6.15-23-amd64-generic
OS: Ubuntu Dapper amd64
java: 1.5

DeliveryTrheads: 1x5 , 1x3 ,1x1
Spools: mysql 4.1

bye
Norman



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