I get the same results whether my Xmx is 84 megs or 512 megs - we're just not using that much memory.
At 08:48 AM 4/20/2005, Peter Lin wrote:
that sounds very odd. so if I understand correctly. this happens when you hit the login page. I assume this don't happen with a static html page? by any chance are you using jsp tags or some web framework?
peter
On 4/20/05, LeeAnn Pultz <[EMAIL PROTECTED]> wrote:
> This is not a memory leak in the application - we have hooked up a profiler
> to the application and watched the actual memory usage when causing this
> issue to happen. We have lots of memory available, are nowhere near the
> Xmx limit, and the machine has lots of memory available over and above the
> Xmx limit.
>
> In fact, I can cause the error to happen every single time, simply by
> hitting the first web page (login page) of the application - I don't have
> to log in, or do any "work". All I have to do to get the error to happen
> is hit 18-19 different instances of the web application, watch the Active
> thread count go up to 100 and tip over the tomcat.
>
> We've gone through all of the suggested infomation out on the web - we've
> tweaked the Xms, Xmx and Xss parameters - none of these changes made any
> difference, since we're not actually running out of memory. I've
> reproduced this on 3 different machines, all running Red Hat Linux ES 3.0 -
> both with LD_ASSUME_KERNEL 2.4.19 and without, so the Linux threading model
> doesn't seem to affect the problem.
>
>
> At 04:16 AM 4/20/2005, you wrote:
> >I'm able to go up to 647 threads and 500 concurrent connections with
> >5.5.4 without any problems. chances are, it's a memory leak in the
> >webapp. only way to know for sure is to profile the application.
> >
> >peter lin
> >
> >
> >On 4/20/05, Tim Funk <[EMAIL PROTECTED]> wrote:
> > > There are no limits in tomcat.
> > > http://jakarta.apache.org/tomcat/faq/memory.html
> > >
> > > -Tim
> > >
> > > LeeAnn Pultz wrote:
> > >
> > > > I have a tomcat server with multiple copies of our web application
> > > > running. We are running into what seems to be a hard-coded limit on the
> > > > number of threads available to the Tomcat application.
> > > >
> > > > I have added code to our servlet class which prints out the number of
> > > > active threads whenever I initialize the servlet. On Red Hat Linux
> > > > boxes, whenever we start up enough copies of the servlet to hit 100
> > > > active threads, we reach an OutOfMemoryError - regardless of the Xms/Xmx
> > > > settings (memory profiling shows that we have plenty of memory
> > > > available). On Windows XP, 50 seems to be the magic number.
> > > >
> > > > I have tried tweaking Xss parameters, my ulimit command in Linux shows
> > > > "unlimited" - and I have reached the same results with Tomcat 3.3.1,
> > > > 4.0.28 and 5.0.28 using Java 1.4.1 and 1.4.2. When I use WebLogic 8.1
> > > > on the same Linux box, I reach 241 active threads with no problems
> > > > whatsoever (stopped my testing at that number) so it does not seem to be
> > > > an o/s limitation, or a java limitation - which leads me to believe
> > > > there is something in Tomcat?
> > > >
> > > > Is the number of threads available to tomcat hard coded somewhere? Is
> > > > there a parameter or configuration setting that I can change to increase
> > > > this?
> > > >
> > > > If this question is better off posted to the developers list, please
> > > > someone, let me know :)
> > > >
> > >
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> > >
> >
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>
> LeeAnn Pultz
> ExtraView Corporation
> [EMAIL PROTECTED]
> 831-461-7100 x115
>
>
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>
>
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LeeAnn Pultz
ExtraView Corporation
[EMAIL PROTECTED]
831-461-7100 x115
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