Description of Albis/Lema
The Cray XE6 system consists of 3 cabinets divided in two systems logically independent: Albis, dedicated to production runs (opr) and Lema, meant for research and development (R&D).
This is the basic configuration of the systems:
Albis: 1 cabinet , 18 blades, 72 nodes, 144 sockets, 1728 cores;
Lema: 2 cabinets, 42 blades, 168 nodes, 336 sockets, 4032 cores.
Each compute node is based on dual-socket AMD Opterons, equipped with 2x12 physical cores running at a frequency of 2.1 GHz, with 16 GB DDR3 a memory at 1333 MHz per socket.
Login Nodes are AMD Opteron with 6 physical cores running at 2.2 GHz, with 16GB DDR2 memory at 800 MHz per socket: each login node is equipped with one socket and therefore 2.66 GB are available per core. The hostnames are the following:
albis1, albis2, albis3, albis4, albis8 (opr)
lema1, lema2, lema3, lema4, lema8 (opr)
The systems come with hardware dedicated to pre- and post-processing:
- 2 nodes based on standard service nodes, i.e. AMD Opteron 6-Core, running at 2.2 GHz. Each node has one socket with 6 physical cores per socket and 16GB DDR2 memory (2.66 GB per core);
- each system has 4 additional nodes based on converted compute nodes (i.e. one entire blade with 96 cores): these are AMD Opteron with 12 physical core running at 2.1 GHz. Each node comes with 2 sockets, 12 cores per socket and 32GB DDR3 memory (1.33 GB per core).
The total memory for compute nodes is 7.7TB, namely 16 GB DDR3 memory at 1333 MHz per socket. The system is equipped with the Cray Gemini
Interconnect.
The XE6 system runs the Cray Linux operating system, a stripped down version of Linux with a minimal kernel.