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When looking at the locally available licenses, I see four entries: "Mathematica", "MathKernel", "Sub Mathematica" and "Sub Mathkernel". Now "Mathematica", "MathKernel" and "Sub Mathkernel" are clear, but what are "Sub Mathematica" licenses used for? Are there parallelization constructs for the front end?

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up vote 18 down vote accepted

The basic idea is that if you're running parallel computations that require a front end (for example exporting graphics in a bitmap format,) you don't want your main instance of Mathematica generating the graphic since it would then become a bottleneck. So your sub-MathKernel would use a sub-Mathematica for that purpose.

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+1 for the interesting answer. – Jagra Aug 8 '12 at 18:58

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