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I tried to find an interpretation of the memory segments of the sun java vm, which would also be understandable by an administrator. It should explain what heap / non-heap memory is and the significance of the different memory pools.
If it would somehow relate to the jconsole view, it would be a bonus.
Is there somewhere a website with such an explanation?
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Java Memory Structure: JVM defines various run time data area which are used during execution of a program. Some of the areas are created by the JVM whereas some are created by the threads that are used in a program. However, the memory area created by JVM is destroyed only when the JVM exits.
JVMs allocate memory on an as needed basis from the operating system. Generally, when the JVM starts, it will allocate the minimum memory allocated (Xms) to the application that is running. As the application requires more memory, it will allocate blocks of memory until the maximum allocation (Xmx) has been reach.
The JVM has a default setting of 1/4 of main memory. If you have 4 GB it will default to 1 GB. Note: this is a pretty small system and you get get some embedded devices and phones which this much memory. If you can afford to buy a little more memory it will make your life easier.
JVM Memory Structure. JVM creates various run time data areas in a heap. These areas are used during the program execution. The memory areas are destroyed when JVM exits, whereas the data areas are destroyed when the thread exits.
Here's a list of resources I had noted down. Some of these explain how the heap/garbage collection works and some have details on how to configure everything.
IBM
Sun
Other
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