Setting the Number of Threads Using an OpenMP* Environment Variable
You can set the number of threads using the environment variable
OMP_NUM_THREADS. To change the number of OpenMP threads,
use the appropriate command in the command shell in which the program is going to run,
for example:
For the bash shell, enter:
export OMP_NUM_THREADS=<number of threads to use>
For the csh or tcsh shell, enter:
setenv OMP_NUM_THREADS
<number of threads to use>