Vm size (task manager) vs. heap size java application?

The JVM can use alot of virtual memory which may not use resident memory. On startup it allocates the heap, and maps in its shared libraries. Classes which are loaded use Perm Gen space.

An application can use direct memory which can be as large as the heap maximum. As each thread is created a stack is allocated for each thread. In each case until this memory is used, it might not be allocated to the application i.e.

Not use physical memory. As the application warms up, more of the virtual memory can become physical memory.

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