Let’s first understand the terms and relationship between the same quickly.
• Physical processor – processor that is actually / physically present
• Core – further division of physical processor i.e. a physical processor can contain multiple cores
• Thread – a distinct execution path provided by a core i.e. a core can support multiple threads
• Virtual processor – can be considered equivalent to a thread
That means, Number of virtual processors in a physical processor = count (cores) * count(threads).
But, how does one find the number of cores / threads on a physical processor? The only way that this could be found out is by going to the specs page on Sun/Oracle website. However, recent updates of Solaris 10 did include a fix to report this kind of detail. In case the fix is not there, it can still be found out from the command “kstat cpu_info”. For more details, you may refer to http://blogs.oracle.com/sistare/entry/cpu_to_core_mapping.
• Physical processor – processor that is actually / physically present
• Core – further division of physical processor i.e. a physical processor can contain multiple cores
• Thread – a distinct execution path provided by a core i.e. a core can support multiple threads
• Virtual processor – can be considered equivalent to a thread
That means, Number of virtual processors in a physical processor = count (cores) * count(threads).
psrinfo -p gives the number of physical processorspsrinfo -pv gives the number of virtual processors per each physical processorBut, how does one find the number of cores / threads on a physical processor? The only way that this could be found out is by going to the specs page on Sun/Oracle website. However, recent updates of Solaris 10 did include a fix to report this kind of detail. In case the fix is not there, it can still be found out from the command “kstat cpu_info”. For more details, you may refer to http://blogs.oracle.com/sistare/entry/cpu_to_core_mapping.
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