Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
| pandoc:introduction-to-mul-cluster:01_introduction:04_slurm [2018/02/02 10:51] – Pandoc Auto-commit pandoc | pandoc:introduction-to-mul-cluster:01_introduction:04_slurm [2020/10/20 08:09] (current) – Pandoc Auto-commit pandoc | ||
|---|---|---|---|
| Line 289: | Line 289: | ||
| ===== SLURM ===== | ===== SLURM ===== | ||
| - | ==== Interactive jobs (2) ==== | + | ==== Interactive jobs (2) (excercise) ==== |
| Alternatively the '' | Alternatively the '' | ||
| < | < | ||
| - | salloc -N 1 -J test -p E5-2690v4 --qos E5-2690v4-batch | + | salloc -N 1 -J test -p E5-2690v4 --qos E5-2690v4-batch |
| </ | </ | ||
| + | Then find out where your job is running: | ||
| + | |||
| + | < | ||
| + | squeue -u < | ||
| + | </ | ||
| + | or | ||
| + | |||
| + | < | ||
| + | srun hostname | ||
| + | </ | ||
| + | and connect to it: | ||
| + | |||
| + | < | ||
| + | ssh < | ||
| + | </ | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ===== SLURM ===== | ||
| + | |||
| + | ==== Interactive jobs (2) (excercise) ==== | ||
| + | |||
| + | To get direct interactive access to a compute try: | ||
| + | |||
| + | < | ||
| + | salloc -N 1 -J test -p E5-2690v4 --qos E5-2690v4-batch --mem=10G | ||
| + | </ | ||
| + | |||
| ---- | ---- | ||
| Line 309: | Line 337: | ||
| #SBATCH --mem=2G | #SBATCH --mem=2G | ||
| </ | </ | ||
| - | The cores and the requested memory are then exclusively assigned to the processes of this job via cgroups. | + | The cores and the requested memory are then exclusively assigned to the processes of this job via cgroups. |
| + | |||
| + | |||
| + | ---- | ||
| + | |||
| + | ===== SLURM: memory ===== | ||
| + | |||
| + | * you **have to** specify memory | ||
| + | * slurm does not accept your job without a memory specification | ||
| + | * choose the right amount of memory: | ||
| + | * not too little | ||
| + | * not too much | ||
| + | * too **little** memory: | ||
| + | * could lead to very low speed because of swapping | ||
| + | * could lead to crash of job (experienced with Abaqus) | ||
| + | * too **much** memory | ||
| + | * does not hurt performance and does not kill your job | ||
| + | * but it costs you more of your fair share | ||
| + | |||
| + | |||
| + | ---- | ||
| + | |||
| + | ===== SLURM: memory ===== | ||
| + | |||
| + | ==== why have this annoying feature anyway? ==== | ||
| + | |||
| + | * because of shared usage of nodes | ||
| + | * if we would use nodes **only exclusively** then this would not be necessary | ||
| Line 404: | Line 459: | ||
| ---- | ---- | ||
| + | |||