GPA Screenshot (eight task threads, but only four active at any one time):
That'sinteresting point of view. I justlooked at MSDN and I don't see a Win32 APIfunction like GetThreadAffinityMask.
Also, this is what another topic on MSDN says:
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 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.
From my point of view it looks like there is some limitation, possibly CPU licensing,of a Windows operating system
user 'ssilsbee' uses.
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