top command shows memory usage of java process is two times more than what actually java heap is taking

[Venkat Reddy Valluri]

Hi,
    When I run top command on linux, it is showing  memory usage of java process is 
two times more than what java heap is taking, I got java heap size inside java program 
using "Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();"
    I didn't understand why it is showing like this, Can anybody explain me

Thks,
--Venkat  

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