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Mesh preparation (<code>blockMesh</code>) may be fast enough to be done at the command line (see [[Running jobs]]). The solver (<code>icoFoam</code> and others) is usually the most expensive step and should always be submitted as a Slurm job except in very small test cases or tutorials. | Mesh preparation (<code>blockMesh</code>) may be fast enough to be done at the command line (see [[Running jobs]]). The solver (<code>icoFoam</code> and others) is usually the most expensive step and should always be submitted as a Slurm job except in very small test cases or tutorials. | ||
=== Segfaults with OpenMPI 3.1.2 === | |||
Users have reported random segfaults on Cedar when using OpenFOAM versions compiled for OpenMPI 3.1.2 in single-node jobs (shared memory communication). These issues seem not to happen with other versions of OpenMPI. If you experience such problems, first try to use an OpenMPI 2.1.1-based toolchain. For example: | |||
{{Commands | |||
|module load gcc/5.4.0 | |||
|module load openmpi/2.1.1 | |||
|module load openfoam/7 | |||
}} | |||
===Performance=== | ===Performance=== | ||