We use cookies to ensure that we give you the best experience on our website. You can change your cookie settings at any time. Otherwise, we'll assume you're OK to continue.

Durham University




Welcome to the COSmology MAchine (COSMA)! Here, you will find some information about the COSMA5, COSMA6 and COSMA7 HPC facilities.

Watch the DellEMC COSMA7 video here.

COSMA has been in existence since July 2001 and is now in its 7th generation.

COSMA5 is a Durham system for ICC users and collaborators.

COSMA6 and COSMA7 are the current DiRAC facilities hosted by Durham. COSMA6 was introduced on 1st April 2017 as the DiRAC-2.5 Data Centric service. COSMA7 was introduced as the DiRAC-2.5x system in May 2018, and expanded by DiRAC-2.5y in January 2019, and as DiRAC-2.5z in April 2019.

DiRAC is the UK's integrated supercomputing facility for theoretical modelling and HPC-based research in particle physics, astronomy and cosmology. For more information about DiRAC please visit the DiRAC web pages

The actual load (taken every 15 minutes) on the DiRAC systems can be seen on the SAFE pages:

The COSMA systems run CentOS 7.6, with a 3.10 Linux kernel.

The login details are:
cosma5: or (round-robin to login5a and login5b)
cosma6: (single node, login6a)
cosma7: (round-robin to login7a, login7b and login7c)

All systems use a global slurm batch system. Submission to any queue (cosma, cosma6 and cosma7) can be done from any login node.

COSMA5 is no longer a DiRAC facility. Therefore, DiRAC users should use COSMA6 or 7.

Scheduled downtime

COSMA has 3 periods of scheduled downtime per year, lasting up to a week, though typically the affected period is shorter. Current scheduled periods are:

3-6th February 2020

1-5th June 2020

5-9th October 2020

Contact Details

Institute of Computational Cosmology,
Ogden Centre for Fundamental Physics - West,
Department of Physics,
Durham University,
South Road,
Durham DH1 3LE
COSMA logo


25/11/19: New COSMA6 storage in service across all of COSMA

19/11/19: New COSMA6 storage in service on COSMA6 nodes

11/11/19: New COSMA6 storage migration ongoing

12/10/19: COSMA back into production

7/10/19: COSMA downtime has started

24/9/19: V100 GPUs are ready for use

23/9/19: Advance warning: COSMA downtime starting 7th October

20/9/19: Two NVIDIA V100 GPUs (32GB) have arrived, will be installed shortly.

6/9/19: Lydia Heck's retirement day today! She departs on the 11th.

30/8/19: New COSMA5 storage has arrived. This will be installed and put into production shortly

22/7/19: COSMA awarded funding to replace old /cosma5 storage

15/7/19: COSMA4 /gpfs file system powered down for good!

Older news here!