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From Michael Kleinhenz <>
Subject No more than 500 threads on Windows 2003?
Date Thu, 30 Jun 2005 13:09:37 GMT

I'm currently integrating a SOAP-based middleware on Tomcat (5.5.9) with
Sun JDK 1.5.0_02 and get into problems when using maxThreads with a
value greater than 500.

Tomcat locks up completely without getting back to normal operations
after a while. No exception or error is reported in the logs, it just
stops. All connections are refused after the lockup. Tomcat has enough
memory (>1GB) assigned with the JVM options.

If I use maxThreads="500", the server runs fine, but 500 is not enough
for my project ;-(

I tried to increase the stack size, but this doesn't help..

The connector is defined as:

<Connector port="8888" maxHttpHeaderSize="8192" maxThreads="500"
   minSpareThreads="50" maxSpareThreads="150" enableLookups="false"
   redirectPort="8443" acceptCount="200" connectionTimeout="20000"

If I change 500 to 700 or more, Tomcat locks up. Is this a Windows

Hardware is not an issue, I think.. (dual Xeon 3,4GHz, 4GB)..


Michael Kleinhenz
tarent GmbH . Bahnhofstr. 13 . 53123 Bonn
fon +49 (228) / 52 67 5-0 . fax +49 (228) / 52 67 5-25

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