Login vs Compute Nodes on Commodity Clusters
Categories: Running Jobs
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When you log into an OLCF cluster, you are placed on a login node. Login node resources are shared by all users of the system. Because of this, users should be mindful when performing tasks on a login node.
Login nodes should be used for basic tasks such as file editing, code compilation, data backup, and job submission. Login nodes should not be used for memory or processing intensive tasks. Users should also limit the number of simultaneous tasks performed on the login resources. For example, a user should not run (10) simultaneous
tar processes on a login node.
Memory and processor intensive tasks as well as production work should be performed on a cluster’s compute nodes. Access to compute nodes is managed by the cluster’s batch scheduling system (e.g., Torque/MOAB).
Rhea’s compute nodes are separated into two partitions:
- Jobs that do not specify a partition will run in the rhea partition
- 512 nodes each with 128GB memory.
- To access the gpu partition, batch job submissions should request
- 9 nodes each with 1TB memory and 2 K80 GPUs