Cray XD1
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| The Cray XD1 at the Alabama Supercomputer Center has 144 CPUs and
248 gigabytes of distributed memory. Each compute node has a local disk
(60 gigabytes of which are accessible as /tmp). Also attached to the
XD1 is a high performance Fiber Channel RAID Array (600MB/s), which has 3.4
terabytes of high performance storage accessible as /scratch from each node. Home
directories as well as third party applications use the NFS Filesystem and
share 4 terabytes of Fiber Channel RAID storage.
The machine is physically configured as a set of dual CPU SMP boards with 2, 4, or 8 GB of memory per board. Each CPU is a 2.2 GHz AMD Opteron processor. Each processor has a floating point benchmark (SPECFP) of 1553. The entire machine has a capacity of 634 gigaFLOPS (billion floating point operations per second). The communication between CPUs is a fast interconnect called Rapid Array. This gives a band width of 4 gigabytes per second. The latency is 1.7 microseconds for communication between CPUs in the same chassis and 1.9 microseconds for communication between chassis. The Cray XD1 is capable of Reconfigurable Computing via Xilinx Virtex 4 LX160 FPGAs. ASN has one XD1 chassis equipped with one FPGA per board for a total of 6 FPGAs. |