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From "Allistair Crossley" <Allistair.Cross...@QAS.com>
Subject RE: Memory Leak
Date Thu, 15 Apr 2004 15:37:37 GMT
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.

ADC

-----Original Message-----
From: Ralph Einfeldt [mailto:ralph.einfeldt@uptime-isc.de]
Sent: 15 April 2004 16:32
To: Tomcat Users List
Subject: RE: Memory Leak



Which memory are you talking about:
- Java Heap
  If this doesn't go down after a load peak
  where the load of the heap was near the limit
  you have a problem. (In your test it did get down)
  To solve that, you have to find a reproducable test 
  that exposes the problem and run a profiler with that.

- OS Memory as reported by the task manager
  This will never ever go down until restart.

> -----Original Message-----
> From: Chanan Braunstein [mailto:cbraunstein@knovel.com]
> Sent: Thursday, April 15, 2004 5:24 PM
> To: 'Tomcat Users List'
> Subject: RE: Memory Leak
> 
> 
> Well, I am not sure why tomcat crashes in that case, why 
> isn't it reducing
> the memory over time. I might add that I noticed that even during low
> traffic periods the memory won't go back down. Even if I take 
> one off the
> cluster (hardware load balancer), so no traffic is going to 
> it at all the
> memory doesn't go down.
> 
> 
> 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 11:11 AM
> To: Tomcat Users List
> Subject: RE: Memory Leak
> 
> From your description it is not shure that you have a memory 
> leak at all.
> 
> The vm is not returning free memory to the os. So the memory 
> as seen by the
> os will alway be the maximum value that the jvm ever needed during the
> runtime.
> 
> The other option that explains your observertion is that you 
> test fails to
> expose the memory leak.
> 
> > -----Original Message-----
> > From: Chanan Braunstein [mailto:cbraunstein@knovel.com]
> > Sent: Thursday, April 15, 2004 4:27 PM
> > To: 'Tomcat Users List'
> > Subject: Memory Leak
> > 
> > but then GC kicks in and drops down back to where it was when I 
> > started the test. However, the memory in the task manager 
> keeps going 
> > up.
> 
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