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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

MPI, icc 
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,$LD_RUN_PATH -o hello.bin hello.cpp
MPI, OpenMP, icc 
module load intel/19.0.5
module load impi/2019.5
mpiicc -qopenmp  -Wl,-rpath,$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

MPI, gcc 
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,$LD_RUN_PATH -o hello.bin hello.cpp
MPI, OpenMP gcc 
module load gcc/9.3.0
module load impi/2019.5
mpigcc -fopenmp -Wl,-rpath,$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

Using mpirun the pinning is controled by the MPI library. Pinning by slurm you need to switch off by adding export SLURM_CPU_BIND=none.

MPI only

MPI, full node 
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
module load impi/2019.5
export SLURM_CPU_BIND=none
mpirun -ppn 96 ./hello.bin
MPI, half node 
#!/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
MPI, hyperthreading 
#!/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.
MPI, OpenMP, full node 
#!/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.
MPI, OpenMP, half node 
#!/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.
MPI, OpenMP hyperthreading 
#!/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 4 ./hello.bin

Using srun

MPI only

MPI, full node 
#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=standard96:test
srun --ntasks-per-node=96 ./hello.bin
MPI, half node 
#!/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.
MPI, OpenMP, full node 
#!/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.
MPI, OpenMP, half node 
#!/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.
MPI, OpenMP, hyperthreading 
#!/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
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