Reviewing and Disabling Hyper-Threading in Red Hat Enterprise Linux

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Issue

How do we determine if Hyper-Threading is in use?
How to disable Hyper-Threading (HT) in RHEL?
Is it possible to disable Hyper-Threading (HT) in Red Hat Enterprise Linux?

Environment

Red Hat Enterprise Linux (RHEL) 7
Red Hat Enterprise Linux (RHEL) 6
Red Hat Enterprise Linux (RHEL) 5

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