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Code execution
For examples for code execution, please visit CPU Genoa partition.
Code compilation
For code compilation please use gnu compiler.
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module load gcc/13.3.0 module load openmpi/gcc/5.0.3 mpicc -fopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.c |
Slurm job script
A slurm script is submitted to the job scheduler slurm. It contains
- the request for compute nodes of a CPU Genoa partition and
- commands to start your binary. You have two options to start an MPI binary.
- using
srun(recommended when using Open MPI) - using
mpirun
- using
Using srun
When using Open MPI on the CPU Genoa partitions, you can make benefit of Open MPIs support for Slurm. Resource specifications provided in batch jobs or job steps (srun), such as number of tasks etc, are understood by the MPI library.
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#!/bin/bash
#SBATCH --partition=cpu-genoa
#SBATCH --nodes=2
#SBATCH --ntasks-per-node=8
#SBATCH --cpus-per-task=24
# to avoid usage of Hyperthreads
#SBATCH --hint=nomultithread
# Set number of OpenMP threads to the same of number cpus per task requested from slurm
export OMP_NUM_THREADS=${SLURM_CPUS_PER_TASK}
# Ensure proper binding of OpenMP threads
export OMP_PROC_BIND=true
export OMP_PLACES=cores
srun ./hello.bin |
Using mpirun
With mpirun, you can manipulate the the process binding, mapping and ranking with the command its line arguments. Refer to the man page of the respective MPI library for details.
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