Chris Wilcox added the comment: I was reviewing the docs for the os module and cpu_count should always return the number of cpus on the system, not the usable CPUs. GetMaximumProcessorCount returns a simulated count in WoW64. I have reached back out to the Windows API dev and will see if GetLogicalProcessorInformationEx will allow us to do this. He had thought that my solution that way had other limitations under WoW64.
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