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Now this will only work in Solaris 10, but this should give a nice output of how many Physical CPUs, Physical Cores, and Threads [Virtual CPUs] are recognized by Solaris. This will work on Solaris 10 for SPARC or x86.
The output looks like this:
**********
user@host:~$ ~/bin/cpucount.sh
In host.example.com there are:
1        Physical CPUs/Sockets
8        Physical Cores across all CPUs
8        [...]