Content
Code execution
For examples for code execution, please visit Slurm CPU Genoa partition CPU CLX.
Code compilation
| Codeblock |
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| title | Serial gcc |
|---|
| collapse | true |
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|
module load gcc
gcc -o hello.bin hello.c
gfortran -o hello.bin hello.f90
g++ -o hello.bin hello.cpp |
...
| Codeblock |
|---|
| title | OpenMP gcc |
|---|
| collapse | true |
|---|
|
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
...
| Codeblock |
|---|
| title | OpenMP, full node |
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| collapse | true |
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|
#SBATCH --nodes=1
#SBATCH --partition=cpu-genoa
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=96192
./hello.bin |
| Codeblock |
|---|
| title | OpenMP, half nodehyperthreading |
|---|
| collapse | true |
|---|
|
#SBATCH --nodes=1
#SBATCH --partition=cpu-genoa
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=48384
./hello.bin |
| Codeblock |
|---|
| title | OpenMP, hyperthreading |
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| collapse | true |
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#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.
| Codeblock |
|---|
| title | OpenMP simultaneously |
|---|
| collapse | true |
|---|
|
#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 |
| Codeblock |
|---|
| title | OpenMP simultaneously hyperthreading |
|---|
| collapse | true |
|---|
|
#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 |