Question

I’m trying to set the processor affinity on a process on a machine that has 16 total physical processor cores, 32 logical. Before, we were using an int but that will overflow when you have 32 logical cores.

Will using a long, instead of an int, when setting the processor affinity still work?

See the code below.

 try
 {
    string pathToExe = GetPathToExe( jobType );

    long processorAffinity = DetermineProcessorAffinity();

    Process jobProcess = Process.Start( pathToExe, jobId.ToString() );
    if ( jobProcess != null )
    {
       jobProcess.ProcessorAffinity = new IntPtr( processorAffinity );
    }

 }

Answer 1

From IntPtr documentation:

The IntPtr type is designed to be an
integer whose size is
platform-specific. That is, an
instance of this type is expected to
be 32-bits on 32-bit hardware and
operating systems, and 64-bits on
64-bit hardware and operating systems.

In other words: It should work on 64 bits systems, but not on 32 bit systems. I guess that’s not a problem in your case.