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At Station Q we are employing three computer clusters to do all the number crunching in our numerical work.

The cirrus cluster

In fall 2009 we added a distributed memory machine with some 192 cores for massively parallel computations by combining

• 24 quadcore Nehalem E5530 processors, 2.4 GHz, 24 GByte RAM
• 24 quadcore Nehalem E5530 processors, 2.4 GHz, 48 GByte RAM

which are interconnected by a "fast" Infiniband.

The cirrus cluster allows to allocate some 4,600 cpu hours per day, or roughly 1.7 million cpu hours per year.

The topo cluster

For massively parallel computations such as quantum Monte Carlo simulations we have assembled a distributed memory machine with some 128 cores by combining

• 32 dual-core Opteron 265 processors, 1.8 GHz
• 32 dual-core Opteron 275 processors, 2.2 GHz

which are interconnected by a "slow" Gigabit Ethernet.

The gigio cluster

For memory intensive computations such as DMRG, exact diagonalization and series expansion calculations we have assembled a farm of workstations with comparably large shared memories based on

• 3 dual Opteron 252 processors, 2.6 GHz, 8 GByte memory
• 2 dual Opteron 252 processors, 2.6 GHz, 16 GByte memory
• 2 dual dual-core Opteron 285 processors, 2.6 GHz, 32 GByte memory

which are also interconnected by a Gigabit Ethernet.

© 2006-2011, written by Simon Trebst, see also the disclaimer.