Slurm exports a number of environment variables related to the Cluster, the general configuration and the actual parameters of the Job. These variables are accessible in scripts and have very similar names to the corresponding Slurm or SBATCH options and are therefore easily identifiable.
The full list of environment variables is available at : https://slurm.schedmd.com/sbatch.html#lbAG
Some useful variables :
| SLURM_JOB_PARTITION | Partition used (--partition) |
| SLURM_JOB_NAME | Job name (Warning, unlike the output / error options, the variables% j /% N ... are not replaced !) |
| SLURM_NTASKS | Number of Tasks (--ntasks) |
| SLURM_CPUS_PER_TASK | Number of CPUs per Task (--cpus-per-task) |
| SLURM_JOB_NUM_NODES | Number of nodes requested / deducted (--nodes) |
| SLURM_JOB_NODELIST | List of nodes used (--nodelist) |
To retrieve a 'VAR' environment variable in...
- Shell/Bash/[T]CSH: $VAR
- Python: os.environ.get('VAR') [OU] os.getenv('VAR')
- Java: System.getenv("VAR")
- Lua: os.getenv(VAR)