15 July 2016, 5:00PM update: some additional issues we are facing


OpenMP is a standard for parallel programming on shared-memory systems, including multicore systems. It consists primarily of a set of compiler directives for sharing work among multiple threads. OpenMP is supported by all the Fortran, C, and C++ compilers installed on OSC systems.

Availability & Restrictions

OpenMP is available without restriction to all OSC users. It is supported by the Intel, PGI, and gnu compilers.

Note: Some of the older compiler versions available on Glenn may not support OpenMP.



OpenMP support is built into the compilers. There is no separate module to load.

Building With OpenMP

To build a program with OpenMP, use the compiler flag appropriate to your compiler. The correct libraries are included implicitly.

Compiler Family Flag
Intel -qopenmp or  -openmp
gnu -fopenmp
PGI -mp

Batch Usage

An OpenMP program by default will use a number of threads equal to the number of processor cores available. To use a different number of threads, set the environment variable OMP_NUM_THREADS.

Further Reading

See Also

Fields of Science: