Difference between revisions of "Hybrid Slurm Job"
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| − | + | [[Slurm|SLURM]] is a popular workload manager / job scheduler. | |
| − | + | Here you can find an example of job script to launch a program which is parallelized using MPI and OpenMP at the same time. | |
| − | + | You may find the toy program useful to get started. | |
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| + | == Slurm Job Script == | ||
This hybrid MPI+OpenMP job will start the [[Parallel_Programming|parallel program]] "hello.exe" with 4 MPI processes and 3 OpenMP threads each on 2 compute nodes. | This hybrid MPI+OpenMP job will start the [[Parallel_Programming|parallel program]] "hello.exe" with 4 MPI processes and 3 OpenMP threads each on 2 compute nodes. | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| + | == Hybrid Fortran Toy Program == | ||
You can use this hybrid toy Fortran90 program to test the above job script | You can use this hybrid toy Fortran90 program to test the above job script | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
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| + | == Job Output Example == | ||
When sorting the program output it may look like | When sorting the program output it may look like | ||
<syntaxhighlight lang="fortran"> | <syntaxhighlight lang="fortran"> | ||
Revision as of 17:44, 20 March 2019
SLURM is a popular workload manager / job scheduler. Here you can find an example of job script to launch a program which is parallelized using MPI and OpenMP at the same time. You may find the toy program useful to get started.
Slurm Job Script
This hybrid MPI+OpenMP job will start the parallel program "hello.exe" with 4 MPI processes and 3 OpenMP threads each on 2 compute nodes.
#!/bin/zsh
### Job name
#SBATCH --job-name=HelloHybrid
### 2 compute nodes
#SBATCH --nodes=2
### 4 MPI ranks
#SBATCH --ntasks=4
### 2 MPI ranks per node
#SBATCH --ntasks-per-node=2
### 3 tasks per MPI rank
#SBATCH --cpus-per-task=3
### the number of OpenMP threads
export OMP_NUM_THREADS=$SLURM_CPUS_PER_TASK
### Change to working directory
cd /home/usr/workingdirectory
### Run your parallel application
srun hello.exe
Hybrid Fortran Toy Program
You can use this hybrid toy Fortran90 program to test the above job script
program hello
use mpi
use omp_lib
integer rank, size, ierror, tag, status(MPI_STATUS_SIZE),threadid
character*(MPI_MAX_PROCESSOR_NAME) name
call MPI_INIT(ierror)
call MPI_COMM_SIZE(MPI_COMM_WORLD, size, ierror)
call MPI_COMM_RANK(MPI_COMM_WORLD, rank, ierror)
call MPI_GET_PROCESSOR_NAME(name,len,ierror)
!$omp parallel private(threadid)
threadid=omp_get_thread_num()
print*, 'node: ', trim(name), ' rank:', rank, ', thread_id:', threadid
!$omp end parallel
call MPI_FINALIZE(ierror)
end program
Job Output Example
When sorting the program output it may look like
node: ncm1018.hpc.itc.rwth-aachen.de rank: 0 , thread_id: 0
node: ncm1018.hpc.itc.rwth-aachen.de rank: 0 , thread_id: 1
node: ncm1018.hpc.itc.rwth-aachen.de rank: 0 , thread_id: 2
node: ncm1018.hpc.itc.rwth-aachen.de rank: 1 , thread_id: 0
node: ncm1018.hpc.itc.rwth-aachen.de rank: 1 , thread_id: 1
node: ncm1018.hpc.itc.rwth-aachen.de rank: 1 , thread_id: 2
node: ncm1019.hpc.itc.rwth-aachen.de rank: 2 , thread_id: 0
node: ncm1019.hpc.itc.rwth-aachen.de rank: 2 , thread_id: 1
node: ncm1019.hpc.itc.rwth-aachen.de rank: 2 , thread_id: 2
node: ncm1019.hpc.itc.rwth-aachen.de rank: 3 , thread_id: 0
node: ncm1019.hpc.itc.rwth-aachen.de rank: 3 , thread_id: 1
node: ncm1019.hpc.itc.rwth-aachen.de rank: 3 , thread_id: 2