Is there a way to see how much CPU usage per core a process is using?

Process Explorer at least can show you the threads of a given process and how much CPU those are using. Maybe you can get the core/cpu on which the threads are running somehow and then just add up. I have not much WinAPI experience, URL1 maybe processor affinity can only be queried on processes.

Lol, hard to get my process to be the only non-idle process when running in Vista, so much background noise – Davy8 Mar 12 '09 at 16:22.

Process Explorer at least can show you the threads of a given process and how much CPU those are using. Maybe you can get the core/cpu on which the threads are running somehow and then just add up. I have not much WinAPI experience, though.

So maybe processor affinity can only be queried on processes.

You can't directly get the per-processer cycle times for a given process, but you can estimate it over time with QueryIdleProcessorCycleTime (as it returns idle times for all logical processors, i.e. , cores) and QueryProcessCycleTime and assuming that it is the only non-idling process running.

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