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Is there a similar tool to Windows 7 Resource Monitor in OS X that can show me how many I/O operations are being performed for each active process?

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I am assuming you want something beyond the Activity Monitor? If so could you clarify this in the question? – BinaryMisfit Aug 29 '09 at 21:02
up vote 2 down vote accepted

You can open a wide Terminal window and enter the command:

sudo fs_usage -f filesys

This will show all filesystem activity on the system, as it occurs. It will show not only which processes are accessing the filesystem, but also what they are doing.

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