The Gamma cluster at NSC was a compute resource of 240 compute nodes exclusively serving the researchers at Linköping University. Any staff researcher at Linköping University could apply for a CPU time allocation on Gamma or become member of an already existing project on it. Projects applied for one year at a time and were evaluated locally by NSC, deciding about granting the request. Allocation sizes spanned from 5000 CPUh/month to some hundred thousand CPUh/month on Gamma.
Gamma was first made available to users in June 2015. It was replaced by the Sigma cluster in 2018.
|Hardware||HP Cluster Platform 3000 with SL230s Gen8 compute nodes|
|Processors||8-core Intel Xeon E5-2660 "Sandy Bridge" processors at 2.2GHz|
|Number of compute nodes||240|
|Compute nodes (thin)||2 sockets (16 cores) with 32 GB DDR3 1600 MHz memory (228 nodes)|
|Compute nodes (fat)||2 sockets (16 cores) with 128 GB DDR3 1600 MHz memory (10 nodes)|
|Compute nodes (huge)||2 sockets (16 cores) with 256 GB DDR3 1600 MHz memory (2 nodes)|
|Available CPUh/month||240 * 16 * 24 * 30 = 2 764 800 CPUh/month|
|Login node||1 HP ProLiant DL380p Gen8 server|
|High speed interconnect||Mellanox Infiniband FDR high-speed interconnect|
|Node scratch storage||108 TB (420 GB per thin node, 840 GB per fat/huge node)|
|Global file system||Gamma used NSC's Centre Storage system (shared between Triolith and Gamma)|
|Operating system||CentOS Linux 6|
|Batch queue system||Slurm|