how to know which cpu current process run

Valdis.Kletnieks at Valdis.Kletnieks at
Thu Aug 15 08:57:57 EDT 2013

On Thu, 15 Aug 2013 20:24:21 +0800, loody said:
> is there any shell command or tool can let me know which cpu current
> process run on?

Why are you trying to check from the shell?  What problem are you
trying to solve by knowing which CPU?

(The problem is that it's inherently *very* racy - the process could easily
get bounced across 2 or 3 different CPUs in the amount of time it takes
a shell command to check - and on large SGI UV boxes under sufficient memory
thrashing, it could bounce across 50 or 60 different cores while you check).

And checking the *current* process tells you even less than "checking the
process you care about" - because unless it's a shell builtin, when you
launch the command, it will quite possibly end up on some core other than
the one the shell is running on....
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