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Helios is a hybrid cluster. CPU nodes use x86_64 CPUs, while the GPU partition is based on GH200 superchips, which include an Nvidia Grace - ARM CPU and Nvidia Hopper GPU. HPE Slingshot is used as an interconnect. The login01 node uses an x86_64 CPU and RHEL 8, please . Please keep this in mind when compiling software, etc. Knowing the destination CPU architecture and operating system is important for selecting the proper modules and software. Each architecture has its own set of modules, in order to see the complete list of modules you need to run module avail on a node of a chosen type. Node specification can be found below:

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The same principle was applied to GPU resources, where the GPU-hour is a billing unit, and there are proportional memory per GPU and proportional CPUs per GPU defined (consult the table above).

Note that Helios uses a job-exclusive policy, and currently, minimal resources assigned for a job equal to one node. The job will be billed at the minimum for a whole node (192CPUs on CPU and 4GPUs on GPU partition)!

The cost can be expressed as a simple algorithm:

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Modules' names on Helios are case sensitive.

Sample job scripts

Please note that using bash option -l is crucial for running jobs on Helios, especially on plgrid-gpu-gh200 partition. Please use the following shebang:

#!/bin/bash -l

in your scripts. Example job scripts (without -l option for Ares compatibility) are available on this page: Sample scripts

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