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memory usage of a process on windows

How can we find memory usage of a process on windows?? Task Manager has two columns for VM Size and Mem Usage. Whats the difference between these??
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bedadala_pavan
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bedadala_pavan
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thanassisCommented:
Mem Usage - is the working set size. It is the amount of physical memory which is directly (currently) allocated to the process. It can be accessed without causing a page fault. This includes pages shared with other processes.

VM Size - is the total private virtual memory allocated to the process. This is the number you see when you use the Process Private Bytes counter in Performance Monitor.

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daniellyhCommented:
VM is Virtual Memory, MEM is the physical memory on the system.VM is some sort of memory in the hard disk that used as other purposes like swapping etc.
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LucFCommented:
bedadala_pavan,
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