This evening I did the same with JProbe under 360 requests as you describe and this
led to me gaining a 38% speedup.
The main bottleneck I found was some very simple tags I have were calling out.flush()
at the end. Thiw was consuming 14 seconds of time to flush 1 string from the tag. The
tag is called many times within our JSPs because it calls the current skin label.
By simply removing the flush call the tag call method time across the load test went
down to 2s. Not bad hey. There were other areas which I solved with application scope
caching and a bean pool for a 3rd party bean that takes ages to initialise a
connection.
I am getting there slowly but surely but Yoav I think was right all along and it is
the code and you have to profile it and examine those call graphs!!!
ADC
-----Original Message-----
From: Peter Lin [mailto:[EMAIL PROTECTED]
Sent: Mon 12/04/2004 19:53
To: Tomcat Users List
Cc:
Subject: Re: Tomcat performance issue?
luckily I have a license of Borland OptimizeIt.
What I do is I start tomcat using OptimizeIt. Then I create a test plan in
JMeter. Once tomcat is running, I warm it up by sending it a couple hundred requests
to make sure all the pages are compiled.
before the test starts, use OptimizeIt to garbage collect. Once that is done,
I start the test and look at the number of threads and size of the heap. If there's a
memory leak, either the thread count will increase, or the heap will grow rapidly.
Once I see either one, I then switch to the call graph to get a better picture of
which methods are getting called. Usually, that is enough to point towards a culprit.
repeat, and rinse as many times as needed until you've squashed all bugs and
leaks.
peter lin
Matt Woodings <[EMAIL PROTECTED]> wrote:
I just read your post this morning (I am lurking today as I have a few
issues of my own to clear up :-) ) and I think that is some really good
advice you gave. I do have a question though.
Once you have noticed you have a memory leak, how do you go about locating
it?
Matt
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