JAVA VM problem HP-UX 11.23

[Lionking16]

We have the Java 6.0 running on HP-UX 11.23 and the application on apache 6.0. When ever there are 800 users or more accessing the application, the VM's heap is reaching over 100% and is not releasing. For this, I optimized the catalina.sh with the garbage collection parameters set to ParallelGC. But the system is still behaving the same. If there is some direction why its happenning and any resolutions for this, its appreciated. The JConsole's VM Summary is attached in the file.

[Fabio Ettore]

Hi,

I'd suggest doing a dump of the heap and analyzing that. To do that you have to insert the "-XX:+HeapDump" option to the java start command. Then you can generate a heap dump by issuing "kill -SIGQUIT " on the java process. This will create a file called "java____heapDump.hprof.txt" in the current working directory of the java process. Such file could be of a big size, so assure you have space in the filesystem and largefiles is enabled.

Taking a look at the generated file should help to understand what's happening in the heap.

HTH.

Best regards,
Fabio