Content

Code execution

For examples for code execution, please visit Slurm partition CPU CLX.

Code compilation

Serial gcc

module load gcc
gcc -o hello.bin hello.c
gfortran -o hello.bin hello.f90
g++ -o hello.bin hello.cpp

OpenMP gcc

module load gcc
gcc -fopenmp -o hello.bin hello.c
gfortran -fopenmp -o hello.bin hello.f90
g++ -fopenmp -o hello.bin hello.cpp

Slurm job script

The examples for slurm job scripts, e.g. myjobscipt.slurm, that cover the setup

1 node,
1 OpenMP code running.

Serial

#SBATCH --nodes=1
#SBATCH --partition=cpu-genoa
./hello.bin

OpenMP, full node

#SBATCH --nodes=1
#SBATCH --partition=cpu-genoa
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=96
./hello.bin

OpenMP, half node

#SBATCH --nodes=1
#SBATCH --partition=cpu-genoa
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=48
./hello.bin

OpenMP, hyperthreading

#SBATCH --nodes=1
#SBATCH --partition=cpu-clx:test
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=192
./hello.bin

You can run different OpenMP codes at the same time. The examples cover the setup

2 nodes,
4 OpenMP codes run simultaneously.
The code is not MPI parallel. mpirun is used to start the codes only.

OpenMP simultaneously

#SBATCH --nodes=2
#SBATCH --partition=cpu-genoa
module load impi/2019.5
export SLURM_CPU_BIND=none
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=48
mpirun -ppn 2 \
       -np 1 ./code1.bin : -np 1 ./code2.bin : -np 1 ./code3.bin : -np 1 ./code4.bin

OpenMP simultaneously hyperthreading

#SBATCH --nodes=2
#SBATCH --partition=cpu-genoa
module load impi/2019.5
export SLURM_CPU_BIND=none
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=96
mpirun -ppn 2 \
       -np 1 ./code1.bin : -np 1 ./code2.bin : -np 1 ./code3.bin : -np 1 ./code4.bin

Workflow compiler CPU Genoa

Code execution

Code compilation

Slurm job script