How to start a thread on a specific core?

Question

I have a quad core CPU, and lets say I always want to start a Thread on the second core.

Is that possible in C#?

See [How Can I Set Processor Affinity in .NET?](http://stackoverflow.com/questions/2510593/how-can-i-set-processor-affinity-in-net). — Matthew Flaschen, Jul 05 '11 at 14:36
Possible duplicate of [How Can I Set Processor Affinity in .NET?](https://stackoverflow.com/questions/2510593/how-can-i-set-processor-affinity-in-net) — Yoh Deadfall, Apr 18 '18 at 20:34
Check these discussions: http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/a55733db-cac0-4ccb-a3cc-a584742b41f9/ http://www.eggheadcafe.com/community/aspnet/2/10156145/thread-affinity.aspx http://www.gamedev.net/topic/477794-c-multi-threading-quad-core-thread-affinity/ — ata, Jul 05 '11 at 14:43

score 9 · Accepted Answer · edited May 23 '17 at 10:30

9

Yes. Check out ProcessorAffinity for Windows or SetProcessorAffinity for XBox XNA.

This is also discussed on another Stackoverflow question.

edited May 23 '17 at 10:30

Community

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answered Jul 05 '11 at 14:39

Kynth

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score 8 · Answer 2 · answered Jul 05 '11 at 14:35

8

Yes, take a look at the ProcessorAffinity property for the thread.

answered Jul 05 '11 at 14:35

Chris Van Opstal

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Timeless · Answer 3 · 2017-09-23T06:09:57.123

Set ProcessorAffinity of the process:

0x0001 = 0000 0001 - run on 1st core
                 ↑
0x0002 = 0000 0010 - run on 2nd core
                ↑
0x0003 = 0000 0011 - run on 1st and 2nd core
                ↑↑
0x0004 = 0000 0100 - run on 3rd core
               ↑

Simple code:

using (var process = Process.GetCurrentProcess())
{
  // only run on core number 1
  process.ProcessorAffinity = (IntPtr) 0x0001;
}

How to start a thread on a specific core?

3 Answers3

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