[Omp] Controling the number of processors that take part in an openmp program

[Micah Elliott]

On 2006-10-13 Temp Tmp wrote:

> For example : My computer has 2 cores, and I want to run a program
> that uses 5 threads on 1 core only.

Sounds like Kay and Chris answered the affinity part: taskset or Task
Manager.

> Is there a way to control the number of processors that take part in a
> program that uses the openmp lib?

The number of threads often defaults to the number of processors, but
is implementation dependent.

You can set the environment variable OMP_NUM_THREADS=5, or call
omp_set_num_threads(5), or use the num_threads clause to specify that
you want 5 threads.

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