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How to make program use 2 processors in Visual C++

Posted on 2004-08-31
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Last Modified: 2010-04-01
How can I make my program use two processors? I can't make the code more lighter, so I need more processor speed. Most of the programs however can't use another processor and there is no any help of another processor if program can't use it.

So, I need to know what kind of code I need to make processor nro:2 calculate too.
I'm working with MS Visual C++ 6.
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Question by:Tonde
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7 Comments
 
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Expert Comment

by:grg99
ID: 11941019
First you need a OS that can handle multiple CPU's.  Windows XP can do it, although IIRC you have to download a new HAL.

Then you have to split up the slow parts of your program into at least two threads.  The rest is mostly automatic, the OS will assign the CPU's among the threads.

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by:Jaime Olivares
ID: 11941263
Read this interesting article:
http://www.codeproject.com/cpp/rtl_scaling.asp
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SteH earned 750 total points
ID: 11941290
As grg99 stated you need to have at least two threads for your application. The OS will assign CPU cycles to each thread waiting for execution. Having 2 CPUs two threads can be executed simulatious. Main question/difficulty is how to split the code that you really can profit from using both CPUs. Try to find seperatable jobs in your code and assign a thread to each of them. Synchronizing two CPUs is even more problematic than two threads executed on the same processor. So care needs to be taken that they are not waiting for each other every so often.

One simplistic approach is to have the GUI run on one CPU and do calculations on the other. Depending on how good jobs can be seperated you can create more than those two threads.

The actual scheduling on the CPUs is done by the OS; you don't have to worry.
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LVL 48

Expert Comment

by:AlexFM
ID: 11941480
See also:
SetThreadIdealProcessor
GetProcessAffinityMask
SetProcessAffinityMask
SetThreadAffinityMask
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Expert Comment

by:grg99
ID: 11941640
You might also consider posting your code so we can see if we can speed it up.

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Expert Comment

by:Jaime Olivares
ID: 12328008
Provided the author with theoretical and practical information.
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