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Date: Fri, 12 Oct 2001 11:58:35 +0100 (BST)
From: =?iso-8859-1?q?Janek=20Bogucki?= <janekdb@yahoo.co.uk>
Subject: Re: Can you assign low priority to a JSP?
To: tomcat-user@jakarta.apache.org
In-Reply-To: <001f01c152a7$5aa9fb70$25cc8780@uchicago.edu>
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If you aren't acquiring a lock on some resource which
would prevent the data entry JSPs from completing
perhaps you could put the thread to sleep between
rows.

Just a thought.

Janek Bogucki.

 --- Matt Fisher <mjf@press.uchicago.edu> wrote: > I
have a JSP which generates a huge report, output
> as HTML. It's a total
> resource hog. With thread-pooling enabled, I am able
> to run at most two
> instances of this JSP. At that point, no other
> request gets a response from the
> server (Apache 1.3.20; Tomcat 3.2.3) until at least
> one of the reports finishes.
> 
> Is there any way to assign a low priority to the
> report JSP, so that it will
> temporarily release resources as higher-priority
> requests come in? The data
> entry JSPs are of much higher priority....
> 
> I assume the problem is available threads. Is there
> any way to check how many
> threads are being used at any given time?
> 
> The report does one large query, then loops through
> each row in the result set,
> and executes four subqueries for each row. Could
> this be hogging all the
> available threads? Any way to make the subqueries
> reuse the same threads on each
> iteration?
> 
> Many questions, and many thanks for any advice you
> can provide. At this point,
> I'm very discouraged about Tomcat in general.
> 
> One small bit of good news -- enabling thread
> pooling, and trashing some pages
> which did XML processing, has eliminated the out of
> memory errors I'd been
> seeing.
> 
> Yours,
> 
>  - Matt
> . . . . . . . . . . . . . . .
> Matthew J. Fisher
> Applications Programmer
> University of Chicago Press
> 1427 E. 60th Street
> Chicago, IL 60637-2954
> Tel 773-834-5386
>  

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