How to know jvm memory usages: "heap memory" and "off-heap memory"

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I want to see the details about "heap memory" and "off-heap memory". I have used jmap to see the heap memory usages, and I want to know the "off-heap memory" usages. I tried to use pamap pid command, but only can see the total memory used by the java process. And I want to see more details which are using the off-heap memory.

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