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From "Morrison, John" <>
Subject RE: [C2] Loadtest
Date Mon, 20 Aug 2001 14:57:22 GMT
It looks like lots of people are now currently load testing.  Could anybody
else please also share their findings and settings?

I've also been plugging in a profiling tool - but I couldn't see anything
obvious :(



> -----Original Message-----
> From: []
> Sent: Monday, 20 August 2001 3:50 pm
> To:
> Subject: [C2] Loadtest
> Hi all, 
> I'm back from the dungeons of load testing. And I don't have 
> particularly
> good news, I'm afraid.
> C2 leaks memory and CPU. The accompanying PNG shows the 
> graphs of a loadtest
> with loadrunner, on tomcat 3.2.1 and C2 cvs version of last 
> week, with 50
> concurrent users surfing around on the simple sample pages 
> (no xsp, no sql,
> just the xml->html pages)
> The graphs don't look good, to say the least. 
> Moreover, when I stopped loadrunner, and monitored the CPU 
> used by java, it
> kept burning 50-70% (even after 2 days). It was sort of 
> cyclic behaviour: it
> dropped to 0%, raised to 50-70%, dropped again to 0%, and so 
> on. I also saw
> the java process eating memory away (approx. 10MB/h)
> The test was done with loadrunner 6.5 on a single 350 MHz cpu 
> with 196MB
> RAM, OS: NT 4, JVM: Sun JDK1.3.1.
> And now for the really bad news: I don't have a clue as how 
> to find the
> source of such a leak. I could browse step-by-step through 
> the code, but
> this seems a daunting task to say the least. Has anyone some 
> hints as to say
> "I would begin looking there", or "I would first test this 
> and see what
> happens", ... ? I've already been musing about the pooling of 
> the components
> (probably components that aren't given back to the pool), but 
> that is also
> pretty hard to find.
> Thanks for any pointers,
> tomK

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