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users:slurm [2016/04/01 13:24] – [Running 32 MPI job on two nodes] ecaloreusers:slurm [2016/11/07 13:56] (current) – [Running 16 MPI job using 16 GPUs on one node] ecalore
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 The examples below assume you are submitting the job from the same directory your program is located in, otherwise you need to give the full path. The examples below assume you are submitting the job from the same directory your program is located in, otherwise you need to give the full path.
 +
 +<WRAP center round important 80%>
 +All jobs by default will run on the //shortrun// [[users:partitions|partition]] which is limited to 30min. If needed different partitions have to be specified. 
 +</WRAP>
  
 ==== Running an OpenMP job on one node ==== ==== Running an OpenMP job on one node ====
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 #SBATCH --error=my_job_name-%j.err #SBATCH --error=my_job_name-%j.err
 #SBATCH --output=my_job_name-%j.out #SBATCH --output=my_job_name-%j.out
-#SBATCH --ntasks 4+#SBATCH --ntasks=4
 #SBATCH --ntasks-per-node=4 #SBATCH --ntasks-per-node=4
  
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 <code bash> <code bash>
 #!/bin/bash #!/bin/bash
-#SBATCH --ntasks 32+#SBATCH --ntasks=32
 #SBATCH --ntasks-per-node=16 #SBATCH --ntasks-per-node=16
  
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 We also load the cuda and openmpi [[users:software|modules]]. We also load the cuda and openmpi [[users:software|modules]].
  
-Remember that SLURM will decide which GPUs to reserve for you, thus is your program duty to select the correct device IDs, otherwise GPUs could not be accessed. The list of the reserved device IDs is in the //CUDA_VISIBLE_DEVICES// environment variable. In this example we pass this variable as an argument to our program.+Remember that SLURM will decide which GPUs to reserve for you, thus is your program duty to select the correct device IDs, otherwise GPUs could not be accessed. The list of the reserved device IDs is in the [[https://devblogs.nvidia.com/parallelforall/cuda-pro-tip-control-gpu-visibility-cuda_visible_devices/|$CUDA_VISIBLE_DEVICES]] environment variable. If you are developing your own software, we suggest to read this variable from your code (e.g. in C using the [[http://linux.die.net/man/3/getenv|getenv()]] function).
  
 <code bash> <code bash>
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 #SBATCH --error=gpu-test-%j.err #SBATCH --error=gpu-test-%j.err
 #SBATCH --output=gpu-test-%j.out #SBATCH --output=gpu-test-%j.out
-#SBATCH --ntasks 16+#SBATCH --ntasks=16
 #SBATCH --ntasks-per-node=16 #SBATCH --ntasks-per-node=16
 #SBATCH --partition=longrun #SBATCH --partition=longrun
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 module load openmpi module load openmpi
  
-srun ./my_program $CUDA_VISIBLE_DEVICES+srun ./my_program
 </code> </code>
 +
 +===== Additional Examples =====
 +
 +You can find additional generic examples here:
 +
 +[[https://www.hpc2n.umu.se/batchsystem/examples_scripts|High Performance Computing Center North]]
 +
 +[[http://www.ceci-hpc.be/slurm_faq.html|Consortium des Équipements de Calcul Intensif]]
  
 ===== Meaning of the most common options ===== ===== Meaning of the most common options =====
users/slurm.1459517045.txt.gz · Last modified: 2016/04/01 13:24 by ecalore