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I want to check the number of processors using by a particular process in unix solaris. Which command we can use for that?

Thanks, D.

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2 Answers 2

You can use psrinfo -v for that.

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cat /proc/cpuinfo –  Ivan Oct 2 '12 at 1:51
/proc/cpuinfo is a Linux feature. prsinfo -v doesn't tell which process is using which cpu. –  jlliagre Oct 2 '12 at 6:21

A single threaded process will only use at most one CPU and unless bounded to a processor set it can be any of them.

To know what CPUs a given process is using at a given time, you can run this command (replace pid is the process id):

prstat -p pid -n 65536 -c 0 1 | grep cpu

Remove the | grep cpu part to see all threads, including those currently sleeping.

Note that even multi-threaded processes will rarely use a lot of CPUs, if any, as they are often I/O bound, not CPU bound.

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Oh, I misunderstood his question I guess. I read it as "Check number of processors using a command". –  favoretti Oct 2 '12 at 6:57

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