Re: Help Regarding Dual Core/ HT Processors

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Intel would have nothing to do with what he is asking for. Windows will act in SMP mode if there are truly multiple, HT or Core/Quad DUO processors

Snip from MSDN
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Multiple Processors
The system uses a symmetric multiprocessing (SMP) model to schedule threads on multiple processors. With this model, any thread can be assigned to any processor. Therefore, scheduling threads on a computer with multiple processors is similar to scheduling threads on a computer with a single processor. However, the scheduler has a pool of processors, so that it can schedule threads to run concurrently. Scheduling is still determined by thread priority. However, on a multiprocessor computer, you can also affect scheduling by setting thread affinity and thread ideal processor, as discussed here.

Thread Affinity

Thread affinity forces a thread to run on a specific subset of processors. Use the SetProcessAffinityMask function to specify thread affinity for all threads of the process. To set the thread affinity for a single thread, use the SetThreadAffinityMask function. The thread affinity must be a subset of the process affinity. You can obtain the current process affinity by calling the GetProcessAffinityMask function.

Setting thread affinity should generally be avoided, because it can interfere with the scheduler's ability to schedule threads effectively across processors. This can decrease the performance gains produced by parallel processing. An appropriate use of thread affinity is testing each processor.


Thread Ideal Processor

When you specify a thread ideal processor, the scheduler runs the thread on the specified processor when possible. Use the SetThreadIdealProcessor function to specify a preferred processor for a thread. This does not guarantee that the ideal processor will be chosen, but provides a useful hint to the scheduler.




"Pavel A." <pavel_a@xxxxxxxxxxxxxxx> wrote in message news:e7F53X35HHA.3740@xxxxxxxxxxxxxxxxxxxxxxx
"Inthi" <Inthi@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:F3B440DD-50D5-41B0-9075-6DA424DAAD12@xxxxxxxxxxxxxxxx
Hi All,

I am a VC++ Win32/MFC developer. I have couple of threads running in my
application which runs in single/Dual Core/HT processors. If my application
is running in Dual Core/HT Processor i want to determine which thread is
running in which processor (Say Processor One or Two). Can you please let me
know which API in Win32/MFC will give me the above support. I have used used
SetThreadAffinityMask / GetProcessAffinityMask API's but I am not able to
determine whether my thread/process is really running on Processor one or
two.

Hi,

Please try Intel developer forums. Get the information from the first hands.

http://softwarecommunity.intel.com/isn/home/MultiCore.aspx

Regards,
--PA



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