Mailing-List: contact users-help@tomcat.apache.org; run by ezmlm
Precedence: bulk
Reply-To: "Tomcat Users List" <users@tomcat.apache.org>
Received-SPF: pass (athena.apache.org: domain of mgainty@hotmail.com
 designates 65.54.246.73 as permitted sender)
Message-ID: <BAY108-DAV10DD60CD2614EA53C2DD8FAE880@phx.gbl>
From: "Martin Gainty" <mgainty@hotmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
References: <7b140ee20711041725v67c3a212nd8a0ff176f3934e7@mail.gmail.com>
Subject: Re: Tomcat causing high CPU load
Date: Sun, 4 Nov 2007 21:20:33 -0500
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

what happens in jconsole over that period of time?
M-
----- Original Message -----
From: "Sai Bobba" <bobcatriaz@gmail.com>
To: <users@tomcat.apache.org>
Sent: Sunday, November 04, 2007 8:25 PM
Subject: Tomcat causing high CPU load


> Hi,
>
> I'm using the following:
>
> JDK1.5
> Tomcat 6
> SQL Server 2000
> Server running on Windows 2000
>
> The web app deployed consists of: an application form filled in by the
> prospective student, a servlet that gets the form parameters
> (>60), processes them, and saves the data input by the user to several
> tables in the database.  Processing of the form data involves applying
> testing the data against admission criteria.
> When the web ap was first deployed some months ago, we had the problem
that
> some of the input by the users was too large for the space allocated in
the
> corresponding column in the db table - this caused SQLExceptions to be
> thrown each time this happened. At the same time we noticed that many
times
> a day the CPU load on the server machine was up at 60% - 90+% - Tomcat was
> responsible for this CPU load almost exclusively - the other processes
> running on the machine were taking <3%. This meant having to restart
Tomcat
> several times a day. At first we thought this was related to the db
> insertion problem. We fixed the db issue so that no more exceptions are
> thrown, but we still find the CPU load up at >60% at least once a day -
> Tomcat responsible again.
> Another thing I noticed in testing the app was that if after I submitted
an
> application I hit the 'Back' button on the browser and then submitted
again,
> app would hang, and the CPU load on the server machine would rise to >60%.
I
> tried this several times, with the same result each time. However, it was
> possible to submit an aplication from a different browser even when the
CPU
> load was high. Oddly, when I did this test on my local machine I didn't
have
> this problem.
> I hope I've laid out the situation clearly. My searches on the web for
this
> sort of problem have yielded no solution.
> If anybody has had this problem and fixed it, or has an insight into what
> the problem might be, I'd greatly appreciate hearing about it!
>
> Many thanks!
>
> bob
>


---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org