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Advanced MPI scheduling: Difference between revisions
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<!--T:5--> | <!--T:5--> | ||
{{File | |||
|name=basic_mpi_job.sh | |||
|lang="sh" | |||
|contents= | |||
#!/bin/bash | |||
#SBATCH --ntasks=15 | |||
#SBATCH --mem-per-cpu=3G | |||
srun application.exe | |||
}} | |||
This will run 15 MPI processes. The cores could be allocated on one node, on 15 nodes, or on any number in between. | This will run 15 MPI processes. The cores could be allocated on one node, on 15 nodes, or on any number in between. | ||
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==== Few cores, single node ==== <!--T:6--> | ==== Few cores, single node ==== <!--T:6--> | ||
If you need less than a full node but need all the cores to be on the same node, then you can request, for example, | If you need less than a full node but need all the cores to be on the same node, then you can request, for example, | ||
{{File | |||
|name=less_than_whole_node.sh | |||
|lang="sh" | |||
|contents= | |||
#!/bin/bash | |||
#SBATCH --nodes=1 | |||
#SBATCH --ntasks-per-node=15 | |||
#SBATCH --mem=45G | |||
srun application.exe | |||
}} | |||
In this case you could also say <code>--mem-per-cpu=3G</code>. The advantage of <code>--mem=45G</code> is that the memory consumed by each individual process doesn't matter, as long as all of them together don’t use more than 45GB. With <code>--mem-per-cpu=3G</code>, the job will be canceled if any of the processes exceeds 3GB. | In this case you could also say <code>--mem-per-cpu=3G</code>. The advantage of <code>--mem=45G</code> is that the memory consumed by each individual process doesn't matter, as long as all of them together don’t use more than 45GB. With <code>--mem-per-cpu=3G</code>, the job will be canceled if any of the processes exceeds 3GB. | ||