OpenMP for GPU A100

März 01, 2024

To build and execute code on the GPU A100 partition, please login to

a GPU A100 login node, like bgnlogin.nhr.zib.de.
see also GPU A100 partition

Code build

For code generation we recommend the software package NVIDIA hpcx which is a combination of compiler and powerful libraries, like e.g. MPI.

Plain OpenMP for GPU

bgnlogin1 $ module load nvhpc-hpcx/23.1
bgnlogin1 $ module list
Currently Loaded Modulefiles: ... 4) hpcx   5) nvhpc-hpcx/23.1
bgnlogin1 $ nvc -mp -target=gpu openmp_gpu.c -o openmp_gpu.bin

MPI + OpenMP for GPU

bgnlogin1 $ module load nvhpc-hpcx/23.1
bgnlogin1 $ mpicc -mp -target=gpu mpi_openmp_gpu.c -o mpi_openmp_gpu.bin

Code execution

All available slurm partitions for the A100 GPU partition you can see on Slurm partition GPU A100.

Job script for plain OpenMP

#!/bin/bash
#SBATCH --partition=gpu-a100:shared
#SBATCH --gres=gpu:1
#SBATCH --nodes=1
#SBATCH --ntasks-per-node=72

./openmp_gpu.bin

Job script for MPI + OpenMP

#!/bin/bash
#SBATCH --partition=gpu-a100
#SBATCH --gres=gpu:4
#SBATCH --nodes=2
#SBATCH --ntasks-per-node=72

module load nvhpc-hpcx/23.1
mpirun --np 8 --map-by ppr:2:socket:pe=1 ./mpi_openmp_gpu.bin