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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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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.

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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