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Subject: RE: Question using JProfiler with Tomcat
Date: Tue, 2 Dec 2003 12:33:55 -0500
Message-ID: <9C5166762F311146951505C6790A9CF8013DF794@US-VS1.corp.mpi.com>
Thread-Topic: Question using JProfiler with Tomcat
Thread-Index: AcO4+iuKXKOHVG0gQH+dY+u5BO1ZjgAAARCQ
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>


Howdy,
Never use a profiler for absolute values such as how much memory an
object takes or how much time it takes to do a certain operation.  The=

time and memory are severely (often orders of magnitude) skewed by the=

profiler.  Instead, use relative values as appropriate (e.g. 30% of th=
e
time is spent in this method, rather than 30ms to do the method, or th=
is
last change provided a 10% improvement in memory usage rather than a
10MB reduction).

What are Mo of memory?  MB and a typo I guess?

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Laurent Michenaud [mailto:lmichenaud@adeuza.fr]
>Sent: Tuesday, December 02, 2003 12:32 PM
>To: tomcat-user@jakarta.apache.org
>Subject: Question using JProfiler with Tomcat
>
>Hi,
>
>I'm using Jprofiler to monitor my web application running on Tomcat.
>My Webapp uses XML/XSLTC to generate the html page.
>
>Looking at the JVM, I was horrified to see that some pages are using
>more than 30 Mo of memory.
>
>So, I've added another webapp that shows the JVM ( graphic in a apple=
t
>).
>
>This applet shows differents values from Jprofiler about memory
>consumption.
>The used memory is not so much.
>
>I think it is due to the fact that Jprofiler creates a lot of objects=

to
>inspect the JVM.
>
>So my conclusion is :
>Don't use Jprofiler to see our much memory your web application use !=

Or
>divide the obtained
>values by 3 or 4.
>
>What's your opinion about that ?
>
>Thanks
>


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