Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision Next revisionBoth sides next revision | ||
| doku:multimpi [2019/03/12 12:47] – created jz | doku:multimpi [2021/04/01 07:08] – [VSC-4] markus | ||
|---|---|---|---|
| Line 3: | Line 3: | ||
| Sample job script to run two MPI tasks within one job script concurrently: | Sample job script to run two MPI tasks within one job script concurrently: | ||
| - | == With srun: == | + | ==== VSC-4 ===== |
| + | |||
| + | Sample Job when for running multiple mpi jobs on a VSC-4 node. | ||
| + | |||
| + | Note: The " | ||
| + | |||
| + | < | ||
| + | mem_per_task * mytasks < mem_per_node - 2Gb | ||
| + | </ | ||
| + | |||
| + | The approx 2Gb reduction in available memory is due to operating system stored in memory. For a standard node with 96 Gb of Memory this would be eg.: | ||
| + | |||
| + | < | ||
| + | 23 Gb * 4 = 92 Gb < 94 Gb | ||
| + | </ | ||
| + | |||
| + | < | ||
| + | # | ||
| + | #SBATCH -J many | ||
| + | #SBATCH -N 1 | ||
| + | |||
| + | export SLURM_STEP_GRES=none | ||
| + | |||
| + | mytasks=4 | ||
| + | cmd=" | ||
| + | mem_per_task=10G | ||
| + | |||
| + | for i in `seq 1 $mytasks` | ||
| + | do | ||
| + | srun --mem=$mem_per_task --cpus-per-task=2 --ntasks=1 $cmd & | ||
| + | done | ||
| + | wait | ||
| + | |||
| + | </ | ||
| + | |||
| + | ==== VSC-3 ===== | ||
| + | |||
| + | === With srun: === | ||
| < | < | ||
| #!/bin/bash | #!/bin/bash | ||
| Line 25: | Line 62: | ||
| </ | </ | ||
| - | == With mpirun (Intel MPI): == | + | === With mpirun (Intel MPI): === |
| < | < | ||
| Line 48: | Line 85: | ||
| </ | </ | ||
| - | You can download the C code example here: | + | You can download the C code example here: {{ : |
| + | |||
| + | Compile it e.g. with: | ||
| + | |||
| + | < | ||
| + | # module load intel/18 intel-mpi/ | ||
| + | # mpiicc -lhwloc hello_world.c -o hello_world_intelmpi2018 | ||
| + | </ | ||