Code Compilation
For code compilation you can choose one of the two compilers Intel or Gnu. Both compilers are able to include the Intel MPI library.
Intel compiler
| Codeblock |
|---|
| title | MPI, icc |
|---|
| collapse | true |
|---|
|
module load intel/19.0.5
module load impi/2019.5
mpiicc -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.c
mpiifort -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.f90
mpiicpc -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.cpp |
...
| Codeblock |
|---|
| title | MPI, OpenMP, icc |
|---|
| collapse | true |
|---|
|
module load intel/19.0.5
module load impi/2019.5
mpiicc -qopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.c
mpiifort -qopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.f90
mpiicpc -qopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.cpp |
Gnu compiler
| Codeblock |
|---|
| title | MPI, gcc |
|---|
| collapse | true |
|---|
|
module load gcc/9.3.0
module load impi/2019.5
mpigcc -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.c
mpif90 -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.f90
mpigxx -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.cpp |
| Codeblock |
|---|
| title | MPI, OpenMP gcc |
|---|
| collapse | true |
|---|
|
module load gcc/9.3.0
module load impi/2019.5
mpigcc -fopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.c
mpif90 -fopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.f90
mpigxx -fopenmp -Wl,-rpath,$LD_RUN_PATH -o hello.bin hello.cpp |
Code execution
You need to start the MPI parallelized code on the system. You can choose between two approaches, namely using mpirun or srun.
...
Using mpirun the pinning is controled controlled by the MPI library. Pinning by slurm you need to switch off by adding export SLURM_CPU_BIND=none.
MPI only
| Codeblock |
|---|
| title | MPI, full node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
mpirun -ppn 96 ./hello.bin |
| Codeblock |
|---|
| title | MPI scattered, half node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
export I_MPI_PIN_DOMAIN=core
export I_MPI_PIN_ORDER=scatter
mpirun -ppn 48 ./hello.bin |
| Codeblock |
|---|
| title | MPI, hyperthreading |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
mpirun -ppn 192 ./hello.bin |
MPI, OpenMP
You can run one code compiled with MPI and OpenMP. The examples cover the setup
- 2 nodes,
- 4 processes per node, 24 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP, full node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
export OMP_NUM_THREADS=24
mpirun -ppn 4 ./hello.bin |
The example covers the setup
- 2 nodes,
- 4 processes per node, 12 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP, half node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=12
mpirun -ppn 4 ./hello.bin |
The example covers the setup
- 2 nodes,
- 4 processes per node using hyperthreading,
- 48 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP hyperthreading |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=48
mpirun -ppn 192 4 ./hello.bin |
Using srun
MPI only
| Codeblock |
|---|
| title | MPI, full node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
srun --ntasks-per-node=96 ./hello.bin |
| Codeblock |
|---|
| title | MPI, half node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
srun --ntasks-per-node=48 ./hello.bin |
MPI, OpenMP
You can run one code compiled with MPI and OpenMP. The example covers the setup
- 2 nodes,
- 4 processes per node, 24 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP, full node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=24
srun --ntasks-per-node=4 --cpus-per-task=48 ./hello.bin |
The example covers the setup
- 2 nodes,
- 4 processes per node, 12 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP, half node |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=12
srun --ntasks-per-node=4 --cpus-per-task=24 ./hello.bin |
The example covers the setup
- 2 nodes,
- 4 processes per node using hyperthreading,
- 48 threads per process.
| Codeblock |
|---|
| title | MPI, OpenMP, hyperthreading |
|---|
| collapse | true |
|---|
|
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
export OMP_PROC_BIND=spread
export OMP_NUM_THREADS=48
srun --ntasks-per-node=4 --cpus-per-task=48 ./hello.bin |