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The 2 is a distributed memory machine based on the IBM Power2 chipset. Each node is, effectively, an independent workstation with its own operating system, paging space, and local disk space. The nodes are connected in a flat topology, with a high-speed crossbar switch that has a peak performance of $30\,$MB/s. We ran tests on the 2's of the University of Oklahoma and the Cornell Theory Center equipped with $62.5\,$MHz ``thin-node 2'' nodes with 128 to $512\,$MB memory, $\ge 1\,$GB local disk space. In addition, both 2's have a parallel filesystem (PIOFS) that allows parallel IO to improve performance.

Peter H. Hauschildt