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From "Remy Maucherat" <r...@apache.org>
Subject Re: Tomcat 4.0.1 Performance tuning problems
Date Thu, 07 Feb 2002 23:36:47 GMT
> Hello,
>
> We're having some troubles with our Tomcat4.0.1. I'm not sure if there's
> a problem in the configuration or if it's something else.
> First the configuration:
>
> Sun-Fire-280R/Solaris 8
> 1024MB Memory
> Sun jdk1.3.1_01 with 512MB for the jvm
>
> and the following configuration for the proxy-connector:
>
> <Connector className="org.apache.catalina.connector.http.HttpConnector"
>                 port="8081" minProcessors="100" maxProcessors="150"
>                 enableLookups="false"
>                 acceptCount="20" debug="0" connectionTimeout="15000"
>                 proxyPort="80"/>
>
> The server is getting about 300000 requests (hits) a day. A while after
> starting the server we're getting the following message:
>
> 2002-02-07 21:51:29 HttpConnector[8081] No processor available,
> rejecting this connection
>
> It looks like the connections aren't freed after being used. But I'm not
> sure how I can test it.
> Allmost every page contains database-queries, but we're using heavy
> caching (in memory and oscaches for the jsp-pages). What can I do,
> increase the maxprocessors? But how far can I go, I did some tests, but
> it looks like  more than 150 isn't possible. How many memory do I need
> per processor?
>
> If somebody could give some hints.....

Bug 5735 (http://nagoya.apache.org/bugzilla/show_bug.cgi?id=5735) is
currently the "most wanted" Tomcat bug. Unfortunately, it's very hard to
debug or find in which component the bug is, so if you or anyone else can
help, that would be great.

The bug could be either:
- in the connector code, or in the networking code
- in the thread pooling code (in which case the other connectors, like JK,
could be affected since they reuse the code)

You can try the HTTP/1.0 connector (it's commented out in the default
configuration), and see if there are still problems. If the problems are
gone, then it's likely the cause is the first item (although I have no idea
what it could be at this point).

Remy


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