Powershell 4 - Setting processor affinity for runspaces and multiple threads

Question

I'd like to set the cpu-affinity of multiple particular threads.

All the references I've found so far deal with setting the cpu-affinity of a process(PID) but not a thread. Is there a way to accomplish this while using .Net Runspaces? Or am I trying to do something impossible?

The basic idea is: I have a 20 core box and would like to get the threads spread evenly between the cores. Otherwise they all wind up pounding on a single core.

Thanks!

20 cores! You suck! ;-) How are you causing the extra threads to be spun up? Are you using the RunspacePool or something else? — Keith Hill, Jun 09 '14 at 16:54

score 1 · Answer 1 · answered Jun 09 '14 at 18:08

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I'm not sure about a .Net wrapper, but the Win32 api SetThreadAffinityMask does what you need - see documentation here: http://msdn.microsoft.com/en-us/library/windows/desktop/ms686247(v=vs.85).aspx.

answered Jun 09 '14 at 18:08

Jason Shirk

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I'm not sure how that would tie into Runspaces. I don't suppose you have any examples? – Jeremy Jun 10 '14 at 02:37
An example: http://khason.net/blog/parallel-programming-well-it%E2%80%99s-all-about-cpu-affinity-or-how-to-set-processor-affinity-in-wpf/ – Jason Shirk Jun 10 '14 at 17:37
Runspaces have a property ThreadOptions - if you use either ReuseThread (for runspace pools) or UseCurrentThread, you can be sure the runspace isn't creating new threads, so setting the thread affinity once per runspace should suffice. – Jason Shirk Jun 10 '14 at 17:38

Powershell 4 - Setting processor affinity for runspaces and multiple threads

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