Developer Guide

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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>

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.