Have you looked at using the -Xincgc
On Thu, 3 Apr 2003 [EMAIL PROTECTED] wrote:
> Hi there,
>
> I usually track the memory consumption of each request using a debug info
> which prints the free memory available.
>
> Runtime r = Runtime.getRuntime();
> long freeMem = r.freeMemory();
> System.out.println("free memory: " + freeMem);
>
> I think packaging this into a memory tracking module for all requests
> served could be quite informative for a developer.
> Personally I think it's a fundamental weakness of Java that you don't have
> a String.getMemoryConsumption() method or something like that. That would
> make it much easier to track memory consumption.
>
> However, the garbage collector seems to run at quite undetermined
> intervals, because after ten requests in a row the free memory goes up
> again. Does anybody know how to configure the garbage collector for
> Tomcat?
>
> Cheers,
> Johannes
>
>
>
>
>
> "Shapira, Yoav" <[EMAIL PROTECTED]>
> 03.04.2003 21:39
> Please respond to
> "Tomcat Users List" <[EMAIL PROTECTED]>
>
>
> To
> "Tomcat Users List" <[EMAIL PROTECTED]>
> cc
>
> Subject
> RE: monitoring web apps
>
>
>
>
>
>
>
> Howdy,
> The JVM itself (so tomcat as well) can't track memory usage or CPU usage
> "per webapp" as webapp is not a unit of execution in the JVM.
>
> Using a profiler and some load/stress tests, you can profile one
> application at a time to discern its resource consumption and behavior
> under stress. But getting this information at runtime, without a
> profiler, is difficult at best and basically intractable in common
> setups.
>
> Part of the problem is it all comes down to the basic java data types,
> e.g. String and int. You can see that there are 10000 Strings in the
> heap, and with a profiler you can tell where those Strings were created,
> but you can't tell how much total memory they take.
>
> Yoav Shapira
> Millennium ChemInformatics
>
>
> >-----Original Message-----
> >From: Steve Harris [mailto:[EMAIL PROTECTED]
> >Sent: Thursday, April 03, 2003 2:35 PM
> >To: [EMAIL PROTECTED]
> >Subject: monitoring web apps
> >
> >Hi all,
> >
> >I run a few apps under tomcat 4 and I'm wondering if there are any
> tools
> >for monitoring what each app is doing - memory usage, cpu utilization
> etc
> >? I use the manager for monitoring numbers of users, stopping/starting
> >etc but I'm looking for something that geives me more insight.
> >
> >Cheers - Steve
> >
> >
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