Re: Tomcat Site slow and stops responding after certain number of threads

[s prasad]

We use the JK 2 Connector and for some of the sites we have 
maxProcessors=75. My understanding is when the maxProcessors limit is 
reached, the requests are put in queue and this will not cause the site to 
go down. IS this number dependent on total number of TCP/IP connections 
hitting that server on port 80? Is there a downfall of bumping this number 
very high, assuming there is enough memory on the server to allow these 
threads? Can anyone comment on, how to identify the current connector thread 
utilization?

Thanks,
Prasad

From: Graham Bleach <[EMAIL PROTECTED]>
Reply-To: "Tomcat Users List" <[EMAIL PROTECTED]>
To: Tomcat Users List <[EMAIL PROTECTED]>
Subject: Re: Tomcat Site slow and stops responding after certain number of 
threads
Date: Sat, 3 Apr 2004 12:37:43 +0100

On Thu, Apr 01, 2004 at 10:39:37PM -0500, sp k wrote:
> We have a Tomcat site which becomes terribly slow and then stops 
responding
> after the thread count in windows task manager reaches 107 threads. We 
are
> using Tomcat 4.1.27 on windows 2000 machine.  Our load tests could never
> emulate this behavior that occurs under real load. When the site crashes
> the memory consumption of the site is less than the initial max heap 
size
> set for it.
>
> Did any one ever face similar issues, we are baffled as to why 107 
threads?
> Is related to the connector threads or JVM's garbage collection?
>
> Does anyone have any idea why the site would crash at the same thread 
level?

Have you checked the minProcessors and maxProcessors setting for your
connector in $CATALINA_HOME/conf/server.xml? You don't say which
connector you are using, but the Coyote connectors all have a limit on
the number of threads dedicated to connection handling.
Documentation on connector configuration:

http://jakarta.apache.org/tomcat/tomcat-4.1-doc/config/coyote.html

It should be logged when you reach the maximum processors, but I can't,
offhand remember where.
G
--
One of my most productive days was throwing away 1000 lines of code.
        -- Ken Thompson
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