On a hyperthreaded system it can be confusing to determine exactly how many CPU's and Cores a machine has in use. Using the /proc/cpuinfo command will provide the information, but you want to isolate the processor id and core id information for an accurate count.
I am on Red Hat Enterprise 5
-- Type uname -r to display the kernel release
# uname -r
-- cpuinfo provides the information.
# cat /proc/cpuinfo
-- Isolate the number of processors.
# grep "physical id" /proc/cpuinfo | sort -u | wc -l
-- Isolate the number of cores
# grep "core id" /proc/cpuinfo | sort -u | wc -l
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