How to find that Hyper Threading (HT) is enable on my machine or not?

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/proc/cpuinfo will tell you if Hyper Threading (HT) is enabled on your machine or not:

cat /proc/cpuinfo | egrep ‘siblings|cpu cores’ | sort | uniq

cpu cores : 2
siblings : 4

If the values of cpu cores and siblings are equal, then hyper threading is DISABLED otherwise ENABLED.