http://kbase.redhat.com/faq/docs/DOC-7715
Rules:
- grep phy /proc/cpuinfo, how many different physical id will indicate how many physical cpu sockets.
- If the siblings and cpu cores values match, the processors do not support hyperthreading (or hyperthreading is turned off in the BIOS).
- It is worth noting that the presence of the "ht" flag in the cpuflags section of /proc/cpuinfo does not necessarily indicate that a system has hyperthreading capabilities
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