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Cirrus

Cirrus is a HPC and data science service hosted and run by EPCC at The University of Edinburgh. It is supported by the Edinburgh and South East Scotland City Region Deal and by EPSRC. It is one of the UKRI Tier-2 National HPC Services.

Cirrus is available to industry and academic researchers. For information on how to get access to the system please see the Cirrus website.

The Cirrus service is an HPE Cray EX4000 CPU-based system. There are 192 standard compute nodes with 768 GB per node DDR5 memory and 64 high memory nodes with 1,536 GB per node. All compute nodes have dual AMD EPYC 9825 processors with 144 physical cores each (288 physical cores per node). In total the system has 256 compute nodes with 72,728 cores. Nodes are connected by a high-performance Slingshot 11 network.

Important

This documentation is for the new Cirrus EX4000 system that started service on 24 November 2025. The old Cirrus SIG ICE will continue running in parallel for a short time (until 8 December 2025). Documentation for the older Cirrus system is still available.

The menu includes links to:

  • General User Guide: information on how to use Cirrus.
  • Software Applications: using specific software applications on Cirrus.
  • Software Libraries: compiling against specific libraries on Cirrus.
  • Software Tools: Information on using tools such as debuggers and profilers on Cirrus.

Information on using the SAFE web interface for managing and reporting on your usage on Cirrus, applying for user accounts, and more, can be found in the EPCC SAFE Documentation.

If you have questions about Cirrus, please contact the service desk: support@cirrus.ac.uk.