More ever I am using SAP Memory Analyzer which also cannot read heap.bin generated by JMAP with -heap:format=b.

I need heap dumps at different points or scenarios while the application runs to identify memory related bottlenecks i.e. Heap Dump on Demand.

Is there another way to take the “Heap Dump on Demand” using JDK 1.5 so that I can use that heap dump in SAP Memory Analyzer?

I have to use jdk 1.5 only….

Thanks & Regards,
Nirmal

http://java.sun.com/j2se/1.4.2/ReleaseNotes.html

Anyone managed to turn a Linux 1.4.2 core into an hprof binary? Any response very much appreciated.

1) grab the core using gcore or similar
2) generate an hprof binary from the core
3) load the hprof binary using jhat from jdk16 beta 1 (beta2 proved to be buggy)

I am able to analyze cores from 1.4.2 vm’s using jhat this way.

In fact we did this only indirectly - by keeping the python objects themselves, and invoking methods on them, rather than executing scripts for each request. This is much faster anyway.

If the web application reloads you will still be left with unused system states attached to each thread, until all the new threads have been used in your application. This might still be a problem, depending on the servlet containers behaviour and the number of system states you need.

A better (and easier) way is to make sure a servlet never leaks a system state:

    PySystemState old = Py.setSystemState(PyStateLoader.PYTHON_SYSTEM_STATE);
    try {
        ...
    }
    finally {
        Py.setSystemState(old);
    }

The first line will actually create the default system state the first time its called in the VM, and this will end up attaching that singleton state to all the threads.

You could do this with a filter on you whole application.