> Is there any way (command) to find which are the Processors (multi
> processor environment) are used to run a process ,

man top

Search for "SMP", there is a field "Last used CPU" which can be enabled.

Here is the snippet,

j: P  --  Last used CPU (SMP)

           A number representing the last used processor.  In a true SMP 
environment this will likely change frequently since the kernel 
intentionally uses weak affinity.  Also, the very act  of  running  top 
  may break this weak affinity and cause more processes to change CPUs 
more often (because of the extra demand for cpu time).

-- 
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