Abstract

The THOR multi-processor consists of 47 Dual Pentium II/III’s (20 at 450 MHz and 27 at 600 MHz) with 100 Mb/s ethernet networking fabric, connected through an ethernet switch. Sixteen of the 47 nodes have been connected into a two dimensional 4×4 torus using Scaleable Coherent Interconnect (SCI) which allows a maximum bi-directional link speed of 800MB/s. The use of SCI permits the classification of these THOR nodes as a Cache Coherent Non-Uniform Memory Access (CC-NUMA) architecture machine. The combination of these networking fabrics enables THOR to run as a cluster of serial processors or as a fully parallel multi-processor using MPI. The THOR machine can be rapidly reconfigured from a fully parallel mode to an all-serial mode or for mixed parallel-serial use. A 450MHz Dual Pentium II computer provides the gateway into the THOR prototype. THOR currently runs under RedHat Linux 6.1. Users have access to C, C++, and FORTRAN compilers, CERN and NAG numerical libraries, and MPI parallel libraries. PBS (a Portable Batch System) has been running on THOR since March 1999.

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