How to check is heaper threading enabled at your server.
use /proc/cpuinfo
Some OPS recommend to check HT cpu flag, but according to manuals HT – for some processors mean HyperTransport for others mean Heaper Threading
Better way to count siblings
The kernel data Linux exposes in /proc/cpuinfo will show each logical cpu with a unique processor number. A logical cpu can be a hyperthreading sibling, a shared core in a dual or quad core, or a separate physical cpu. We must look at the siblings, cpu cores and core id to tell the difference.
If the number of cores = the number of siblings for a given physical processor, then hyperthreading is OFF.
cat /proc/cpuinfo | grep siblings | wc -l; cat /proc/cpuinfo | grep cores | wc -l
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