Usage of a HPC cluster: Difference between revisions
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[[File:Logical structure HPC cluster.png|500px|top]] | [[File:Logical structure HPC cluster.png|500px|top]] | ||
The structure of a HPC system is sketched in the picture above. | The '''structure of a HPC system''' is sketched in the picture above. | ||
These are the main logical building blocks: | These are the main logical building blocks: | ||
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* computation happens therefore asynchronously (in batch mode), and not on the login node. | * computation happens therefore asynchronously (in batch mode), and not on the login node. | ||
* a specific ''software environment'' is provided on the login node and on the compute node to run parallel jobs | * a specific ''software environment'' is provided on the login node and on the compute node to run parallel jobs | ||
* the above cluster structure is used from commodity local machines to large scale HPC architectures (as shown below for the Summit machine at Oak-Ridge Natl Lab (ORNL), TN, USA) | |||
[[File:Summit ORNL.jpg|300px|top]] | |||
==Connecting== | ==Connecting== | ||
Revision as of 07:16, 30 April 2021
- Prev: LabQSM#Getting Started
- Next: Scripting
Here we collect some general (and by no means complete) information about usage and policies of a HPC cluster.
Structure of a HPC cluster
The structure of a HPC system is sketched in the picture above. These are the main logical building blocks:
- a login node is exposed to users for access (typically via
ssh), - a dedicated scheduler (the queuing system) dispatches computational jobs to the compute nodes
- computation happens therefore asynchronously (in batch mode), and not on the login node.
- a specific software environment is provided on the login node and on the compute node to run parallel jobs
- the above cluster structure is used from commodity local machines to large scale HPC architectures (as shown below for the Summit machine at Oak-Ridge Natl Lab (ORNL), TN, USA)
Connecting
Unless other means are provided, you typically connect using the ssh protocol.
From a shell terminal or a suitable app:
ssh -Y <user>@<machine_host_name> or ssh -Y -l <user> <machine_host_name>
<user>: Unix username on the cluster login node