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I know with start /affinity X where X is a hex-number bit-masking the CPUs to be used a process can be started to use certain CPUs only. However, is there a possibility to state something like "start this process using 50% of the available cores, pick them on your own, but don't use CPU3"?

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That functionality is not exposed via command-line (nor Windows API supports it directly).

It should be relatively straight forward to implement is in specific code but that would most definitely require custom program. I am not aware that there is program supporting such rich functionality.

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...especially if I add "and it should be free and not require admin rights" :p – Tobias Kienzler Aug 23 '10 at 12:41

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