![]() ![]() Each K80 appears as 2 GPU devices while each P100 appears as 1 GPU device. Each computer node either has 2 Tesla K80 or 2 Pascal P100 GPUs. There are two different types of GPUs in the Institutional Cluster. Gres stands for generic resource, gpu is the name of the resource and 4 is the count of GPUs to be used (name:count]) module avail will list available modules on the cluster, and they can be added to job or session environment using module load $modulename.Īs an example, to compile an OpenMPI program: module load mpi/openmpi-x86_64įor running jobs using GPUs please add the following line in sbatch script or srun command line: -gres=gpu:4 Modules are used to manage different software environments on the cluster. To top Using Modules to Manage Environment #SBATCH -e hostname_%j.err # File to which STDERR will be written #SBATCH -o hostname_%j.out # File to which STDOUT will be written These files can be monitor during a job run. Standard output (STDOUT) and standard error (STDERR) messages from jobs are directly written to the output or stderr file name specified in the batch script or to the default output file name (as slurm-jobid.out) in submit directory ($SLURM_SUBMIT_DIR). debug: Use this for small, short test runs.long: Use this for almost all production runs.When submitting a batch job the most common partition to choose are: ![]() This somewhat complex partition structure strives to achieve an optimal balance among fairness, wait times, and run times. Different partitions may have distinct charge rates. The main purpose of having different partitions is to control scheduling priorities and set limits on the number of jobs of varying sizes. The cluster has several partitions to choose from. That way the batch script will have a record of the directives used, which is useful for record-keeping as well as debugging should something go wrong. Sbatch directives can be specified at submission as options but we recommend putting directives in the script instead. Once the batch script is ready, the submission can be done as follows: % sbatch myscript.sh The srun command is used to start execution of application on compute nodes.Directives can also specify things such as what to name standard output files, what account to charge, whether to notify by email job completion, how many tasks to run, how many tasks per node, etc. #SBATCH Directives: In the example, the directives tell the scheduler to allocate 2 nodes for the job, for how long, in which partition, what account, what qos and how many cores to use.Batch scripts will not run without a shell being specified in the first line. In this case, we use bash by specifying #!/bin/bash. The Shell: SLURM batch scripts require users to specify which shell to use.Or by using the long format of SLURM keywords, as below: #!/bin/bash Batch scripts are submitted to the "batch system," where they are queued awaiting free resources.Ī simple SLURM batch script will look like this: #!/bin/bash Finally, it arbitrates contention for resources by managing a queue of pending work.īatch jobs are jobs that run non-interactively under the control of a "batch script," which is a text file containing a number of job directives and Linux commands or utilities. Second, it provides a framework for starting, executing, and monitoring work (typically a parallel job) on a set of allocated nodes. First it allocates exclusive and/or non-exclusive access to resources (computer nodes) to users for some duration of time so they can perform work. Slurm is an open-source workload manager designed for Linux clusters of all sizes. The following table lists recommended and useful #SBATCH keywords. ![]()
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