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Multithreading / CPU Cores in .Net

Posted on 2008-10-30
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Hi!

I'm working on a application/applications that consists of several processes and I wonder  how it works with the processes and the CPU cores, can I point a process to a specific core or is the OS that handles all that?

Why I ask is because  some of the processes (exe files) handles heavy math calculations and I like these processes not to work on the same core as the other processes.

I'm don't know how this  process/multithreading works when it comes to how these resources  are handled by the CPU cores, so I need some help to explain this.

Thx guys
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Question by:AWestEng
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Dhaest earned 2000 total points
ID: 22839199
You can take a look at System.Thread.ProcessorAffinity
http://msdn.microsoft.com/en-us/library/system.diagnostics.process.processoraffinity.aspx


ProcessorAffinity has its value documented in MSDN - look at the remarks section. It's a simple bitmask. http://msdn2.microsoft.com/en-us/library/system.diagnostics.processthread.processoraffinity.aspx

IdealProcessor is also documented in MSDN - again look at the remarks section. It appears to be a simple counter (i.e. 1 is processor 1, 2 is processor 2 etc). http://msdn2.microsoft.com/en-us/library/system.diagnostics.processthread.idealprocessor.aspx

An interesting blog about this subject (with examples)
Spike Your CPUs Processor in .Net
http://www.omegacoder.com/?p=94
Determining the number of processors:
 
\\\
Imports System
..
..
..
.... = Environment.GetEnvironmentVariable("NUMBER_OF_PROCESSORS")
///
 
..NET 2.0: 'Environment.ProcessorCount'.

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by:AWestEng
ID: 22839330
Thx Dhaest: :)
 
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by:AWestEng
ID: 31511578
Thx for all the great examples :)
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