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:construction_site: under construction, please consult [this](https://crimson.oca.eu/fr/acces-fonctionnement/gestion-des-jobs/1340-exemples-de-scripts) in the meantime
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[**M**essage **P**assing **I**nterface](https://www.mpi-forum.org/) (MPI) can be used to distribute parallel aplication on more than one node. We support the Intel implementation.[^1]
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## Get the example
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```
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14:56:53 [alainm@pollux view]# git clone https://gitlab.oca.eu/DSI/HPC.git
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Cloning into 'HPC'...
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...
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Resolving deltas: 100% (39/39), done.
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14:58:03 [alainm@pollux view]# cd HPC/SLURM/MPI/
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14:58:10 [alainm@pollux MPI]# ls
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build.sh CMakeLists.txt mpi.cpp run.slurm
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14:58:12 [alainm@pollux MPI]#
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```
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## Build
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```
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15:06:26 [alainm@pollux MPI]# ./build.sh
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~/view/HPC/SLURM/MPI/rel ~/view/HPC/SLURM/MPI
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...
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Scanning dependencies of target dice
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[ 50%] Building CXX object CMakeFiles/dice.dir/mpi.cpp.o
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[100%] Linking CXX executable dice
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[100%] Built target dice
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~/view/HPC/SLURM/MPI
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‘rel/dice’ -> ‘./dice’
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15:07:12 [alainm@pollux MPI]#
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```
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## Run
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```
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15:07:12 [alainm@pollux MPI]# sbatch --partition=x40 --nodes=2 ./run.slurm
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Submitted batch job 33544995
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15:08:47 [alainm@pollux MPI]# more log-dice-33544995.out
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Hi, this is processs 0 from node x001.cluster.local
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...
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Hi, this is processs 3 from node x002.cluster.local
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..
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Let's play dices.
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Who's de best ?
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This is 0, I got 2, I'm such a looser...
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...
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This is 3, I got 4, I'm so talented
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15:08:54 [alainm@pollux MPI]#
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```
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## Script explanation
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We are now describing the Slurm script [run.slurm](SLURM/MPI/build.sh). Note that we will run 2 task per node to illustrate the fact that the job will use more than one node, although this toy example would be happy with one job per core.
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```
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```
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[^1]: which has an impact in term of Slurm integration. |
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\ No newline at end of file |
