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>