Users cannot connect directly to the nodes. SSH connections are only performed to the Controller and ‘ cluster clients’. Open interactive session - Mainly for testing You need to get permission to use it!įor batch jobs - Limit 6 batch jobs per user You specify a partition using -partition in your job script in order for your job to run on the appropriate type of node using -constraint to specify a specific hardware in the partition.Ī list of the available partitions can be obtained using the sinfo command. On CS Cluster hardware and prioritazion are managed using partitions constraints. The ‘ CPU nodes ’ For jobs that need CPU only (cpu-killable partition) Although not identical to each other, each Node has two Xeon CPUs, several Nvidia GPUs and a considerable amount of RAM. The ‘ cluster nodes’ are servers on which the jobs run n-/s. **These servers are ONLY for debugging/testing - long or multiple process per user will be killed - no prior notice. They are NOT part of Slurm nodes and Slurm will never run jobs on them. The ‘ cluster clients’ are servers (GPU servers) named c-, to which users log on via ssh (again, home dirs and group storage is mounted on the same paths) and from where they can develop, test, and launch jobs. The Controller is a server (without GPUs) named ' op-controller', to which users log on, via ssh (where their home directory and group storage are mounted in the same way as on the other CS servers) and from where they launch jobs. (Go to top) Hardware and Partitions The cluster is made up of one Controller, several cluster nodes and ‘cluster clients’. It helps track and display job details as well. SLURM is software that helps defining and executing these jobs, as well as managing users, permissions and resource allocation. Contrary to normal (or local) program execution, programs (jobs) run via SLURM are launched from the Login (or Controller) server and are sent to one or more of the physical servers (Nodes). What is Slurm? Slurm is a resource manager and job scheduler designed to utilize a fair share of the computing resources. How does Slurm decide what job to start next?
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