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How many compute nodes are there on the cluster, how fast are they, how much memory do they have, and how are they interconnected?

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How many compute nodes are there on the cluster, how fast are they, how much memory do they have, and how are they interconnected?

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The cluster has 158 compute nodes. Each of the original 18 nodes has two Intel Pentium 4 Xeon EM64T processors running at 3.2 GHz, 4 Gbytes of main memory, and a 73 Gbyte SCSI hard drive. In December 2006, an additional 24 nodes were installed. Each of these has two Intel Pentium 4 Xeon EM64T processors running at 3.8 GHz, 4 Gbytes of main memory, and a 73 Gbyte SCSI hard drive. In November 2007, an additional 51 nodes were installed: there are 44 nodes each with two Intel Pentium 4 Xeon EM64T dual-core processors running at 3.0 GHz, 8 Gbytes of main memory, and a 73 Gbyte SAS hard drive, and there are 7 nodes each with two Intel Pentium 4 Xeon EM64T quad-core processors running at 2.33 GHz, 12 Gbytes of main memory, and a 146 Gbyte SAS hard drive. In addition, there is an SMP node with four dual-core Intel Pentium 4 Xeon EM64T processors running at 3.0 GHz, with 32 Gbytes of main memory and mirrored 146 Gbyte SCSI hard drives that has not yet been put into production. In June 2008, an

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