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On a system with heavy memory usage, how can the causative process(es) be identified ?

Solution Unverified - Updated 2014-02-28T09:56:53+00:00 -

Issue

Ona Red Hat Enterprise Linux system running with almost the whole physical memory used up, how can the process(es) causing the heavy memory usage be identified, along with the reasons behind the heavy memory usage ?

Environment

Red Hat Enterprise Linux

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