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Posted to users@tomcat.apache.org by "Ing. Damiano Bolla" <da...@infotechsrl.it> on 2002/09/26 16:14:47 UTC
Re: Tomcat 4.1.12 memory leak, still
I did two more test, here are the results.
At 09.50 26/09/2002 -0400, you wrote:
>you can easily test it out by setting
>
>JAVA_OPTS='-Xmx=64M'
Did set the above before starting tomcat and had the folowing results.
This is the value of SIZE of top
22684
22692
22700
23560
23908
23960
23980
24040
24170
24328
24432
24468
24492
24552
24572
24704
24760
24768
24788
Always reloading the same page (the default page)
I then changed JAVA_OPTS='-Xmx=24M'
and I still had an increasing result
22848
23576
23592
23804
23836
23896
23972
23992
24080
24152
And I must say that if I keep reloading it will keep increasing.
It is a very simple test to do, are you shure that you have the SIZE number
decreasing sometimes ?
It chews little ram at the time so if you have 1Gb ram you notice it only
if you really look at it.
>I've ran extensive load testing with 4.1.10 w/o any problems. Haven't
>done it with 4.1.12, but hopefully it's not a new bug, since the release
>notes don't list anything that might create a new bug.
>
>peter
>
>
>"Ing. Damiano Bolla" wrote:
> >
> > Good explanation but it does not solve the problem.
> > Let me try to be clear.
> >
> > - What I am doing is reloading always the same page.
> > - What I see is an ever increasing consumption of memory.
> >
> > Really why should the JVM want more and more ram ?
> >
> > In any case if you keep reloading, this ever increasing consumption
> > eventually will eat all your ram.
> > Whatever is the explanation it does not seem right to me, is there a way to
> > fix it ?
> >
> > Damiano
> >
>
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Re: Tomcat 4.1.12 memory leak, still
Posted by peter lin <pe...@labs.gte.com>.
you may want to first try running tomcat with verbose gc turned on.
this will tell you whether or not it is working correctly.
refer to previous email I sent with the java options for verbose gc.
peter lin
Raj Saini wrote:
>
> I also did a small test where I was calling a simple servlet in a loop. The
> only resource used in the servlet was a random number generator. The tomcat
> crashed after running few hours.
>
> I used the tomcat 4.1.10 for this. Though I did this test on a very small
> machine (Intel 166Mhz with 128 MB RAM), but the real reason of the crash was
> the insufficent memory. Tomcat had used all the physical and the swap file
> size grown upto 300 MB. Since there was no enough space on the file system
> and swap file size could not be increased, Tomcat crashed eventually.
>
> I attach the servlet code for you evaluation.
>
> Raj Saini
>
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Re: Tomcat 4.1.12 memory leak, still
Posted by Raj Saini <ra...@emerging-trade.com>.
I also did a small test where I was calling a simple servlet in a loop. The
only resource used in the servlet was a random number generator. The tomcat
crashed after running few hours.
I used the tomcat 4.1.10 for this. Though I did this test on a very small
machine (Intel 166Mhz with 128 MB RAM), but the real reason of the crash was
the insufficent memory. Tomcat had used all the physical and the swap file
size grown upto 300 MB. Since there was no enough space on the file system
and swap file size could not be increased, Tomcat crashed eventually.
I attach the servlet code for you evaluation.
Raj Saini
----- Original Message -----
From: "Ing. Damiano Bolla" <da...@infotechsrl.it>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Thursday, September 26, 2002 3:14 PM
Subject: Re: Tomcat 4.1.12 memory leak, still
> I did two more test, here are the results.
>
> At 09.50 26/09/2002 -0400, you wrote:
>
> >you can easily test it out by setting
> >
> >JAVA_OPTS='-Xmx=64M'
>
> Did set the above before starting tomcat and had the folowing results.
> This is the value of SIZE of top
>
> 22684
> 22692
> 22700
> 23560
> 23908
> 23960
> 23980
> 24040
> 24170
> 24328
> 24432
> 24468
> 24492
> 24552
> 24572
> 24704
> 24760
> 24768
> 24788
>
> Always reloading the same page (the default page)
> I then changed JAVA_OPTS='-Xmx=24M'
> and I still had an increasing result
>
> 22848
> 23576
> 23592
> 23804
> 23836
> 23896
> 23972
> 23992
> 24080
> 24152
>
> And I must say that if I keep reloading it will keep increasing.
> It is a very simple test to do, are you shure that you have the SIZE
number
> decreasing sometimes ?
> It chews little ram at the time so if you have 1Gb ram you notice it only
> if you really look at it.
>
>
> >I've ran extensive load testing with 4.1.10 w/o any problems. Haven't
> >done it with 4.1.12, but hopefully it's not a new bug, since the release
> >notes don't list anything that might create a new bug.
> >
> >peter
> >
> >
> >"Ing. Damiano Bolla" wrote:
> > >
> > > Good explanation but it does not solve the problem.
> > > Let me try to be clear.
> > >
> > > - What I am doing is reloading always the same page.
> > > - What I see is an ever increasing consumption of memory.
> > >
> > > Really why should the JVM want more and more ram ?
> > >
> > > In any case if you keep reloading, this ever increasing consumption
> > > eventually will eat all your ram.
> > > Whatever is the explanation it does not seem right to me, is there a
way to
> > > fix it ?
> > >
> > > Damiano
> > >
> >
> >--
> >To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> >For additional commands, e-mail:
<ma...@jakarta.apache.org>
>
>
> --
> To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> For additional commands, e-mail:
<ma...@jakarta.apache.org>
RE: Tomcat 4.1.12 memory leak, still
Posted by Ricky Leung <ri...@booksense.com>.
> >JAVA_OPTS='-Xmx=64M'
I remember I saw in Sun's website that it's lowercase for all, k for kilo, m
for mega, and g for giga, but in this group, people always say use capital
letters. Now I am confused!
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