Open MP Resources

OpenMP Documents and Examples

• OpenMP API
• OpenMP tutorial, by LLNL
• GCC's implementation of OpenMP

Using OpenMP on Chimera

To compile an OpenMP based program on Chimera, use the option -fopenmp with whatever compiler you have set in your modules.

To submit an OpenMP program to the SLURM queue, first set the environment variable "OMP_NUM_THREADS" as the desired number of processing threads. For example, (tcsh):

setenv OMP_NUM_THREADS 4

(bash):

export OMP_NUM_THREADS=4

Then, when using srun or sbatch, include the option "--cpus-per-task=OMP_NUM_OF_THREADS" to ensure that the SLURM controller allocates the necessary number of processor cores to ensure that each OpenMP thread has its own core.