How can I check if hyperthreading is enabled on a Linux machine, using a perl script to check for it?I'm trying the following way:dmidecode -t processor | grep HTTLet me know if I'm on right track.
Checking if HyperThreading is enabled or not?
linux;cpu;hyperthreading
Notes added on July 8, 2014: As Riccardo Murri pointed out, my answer below only shows whether the processor reports to support hyperthreading. Generally, *nix O/S are configured to enable hyperthreading if supported. However, to actually check this programmatically see for instance Nils' answer!---- Original answer from March 25, 2012:You are indeed on the right track :) withdmidecode -t processor | grep HTTOn Linux, I generally just look for ht on the flags line of /proc/cpuinfo. See for instancegrep '^flags\b' /proc/cpuinfo | tail -1or if you want to include the ht in the patterngrep -o '^flags\b.*: .*\bht\b' /proc/cpuinfo | tail -1(\b matches the word boundaries and helps avoid false positives in cases where ht is part of another flag.)