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Is there a way to set number of threads in OpenMP parallel for region based on the value of a variable? Initially for the whole application number of threads = nofCores. On my AMD FX 8350, nofCores =8. For this area if the variable is 3 then I only need 3 threads. If variable>cores then number of threads should remain equal to nofCores.
I do not want to set the number of threads globally for all the application. Just for this specific parallel loop.
Sorry if this is a naive question, but I am a newbie in OpenMP.
370
The OMP_THREAD_LIMIT environment variable sets the maximum number of OpenMP threads to use in a contention group by setting the thread-limit-var ICV. The value of this environment variable must be a positive integer.
OpenMP parallel for loops However, the #pragma omp parallel for directive instructs the compiler to generate code that splits the iterations of the loop among multiple threads. For example, if we have 4 CPU cores, OpenMP typically uses 4 threads.
When run, an OpenMP program will use one thread (in the sequential sections), and several threads (in the parallel sections). There is one thread that runs from the beginning to the end, and it's called the master thread.
Sure .. just tack this on to your parallel for directive:
#pragma parallel for num_threads(variable)
for( ... )
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