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Is is possible to permanently set processor affinity?

Posted on 1997-12-13
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Last Modified: 2013-12-28
I have a dual processor Pentium Pro and I wish to always run a given application on one processor or the other ("hard affinity" in Microsoft terms).  I know how to temporarily set it through the task manager but this application-to-processor association is lost when the application ends.

The primary application I use is Microsoft Excel 95/97.  I am looking for means by which I can "permanently" set this processor affinity (utility, registry tweak, etc.).
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Question by:swartwe
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Expert Comment

by:TimCaturaHouser
ID: 1787470
I don't know of a meathod for this. MS is very proud of the fact that most of their apps usually run faster with SMP. Are you saying Excel runs faster with 1 processor?
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by:swartwe
ID: 1787471
I don't mean to imply that Excel runs faster with one processor.  However, I have an Excel application which often requires hours to run and I want to dedicate it to one processor so that system response will always be good, regardless of what Excel is doing (even though doing so will cause the Excel application take considerably longer to run).  This is why I want to explicitly set the affinity.
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Accepted Solution

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plummer earned 100 total points
ID: 1787472
Create a simple application as follows:

void main(int argc, char ** argv)
{
    // Set desired affinity
    SetProcessorAffinity( ...whatever affinity you'd like...);
    // Launch Excel and let it inherit this affinity
    CreateProcess("C:\Program Files\...\excel.exe");
}

Then compile this and call it "myexcel.exe" or whatever.  When you run it, it will launch excel proper.
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Author Comment

by:swartwe
ID: 1787473
I cannot find the function "SetProcessAffinity" within the context of VC++ 5.0.  However, I can find "SetProcessAffinityMask".  It that the correct function?
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Author Comment

by:swartwe
ID: 1787474
Correction to the last comment...It should have read "I cannot find the function "SetProcessorAffinity"...".  

Incidently, I found SetProcessAffinityMask in winbase.h.
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