| From: Matthew Lee [mailto:mkl@(protected)]
| Subject: Running Tomcat 5.5.9 in AIX 5.2 with Java 5 64-bit - Tomcat
| freezes at a high level of workload
|
| Symptoms
| --------------
| When Tomcat is under heavy load running a webappliccation
| (at around 180 users although it varies), Tomcat 8080 will "freeze",
| whereby no more new uses can access the Webapplication, nor can they
| access the Tomcat Manager page.

Can you get a thread dump from the JVM? That should show if the JVM's
stuck waiting on an external resource or something.

Are you using JNI? I've heard that IBM's JVM doesn't handle JNI well
(something about it using AIX's POSIX pthreads lib). This was under the
1.4 JVM, though, might not apply to 1.5.

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