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$ProcessorCount

$ProcessorCount
gives the number of processor cores available on the computer system on which Mathematica is being run.
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Applications   (2)
By default, as many parallel kernels are launched as there are processor cores:
You can change $ProcessorCount in a new session to simulate a multicore computer:
Possible Issues   (2)
No kernels are launched by default on a single-core computer:
Specify the number of desired kernels to launch them anyway:
Changing $ProcessorCount takes effect only if it happens before using any parallel commands:
You can always launch the desired number of kernels explicitly:
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