The MAGIC electromagnetic (EM) finite difference time domain particle-in-cell (FDTD-PIC) code has been tested for performance speed on typical large-scale electro-energetic calculations. Computer systems employed were the ATK and University of Miami (UMIA) Linux clusters and several single platforms including Windows and Linux dual quad core Intel and AMD machines. A gain of a factor of lOrr over 2006 state-of-the-art personal computers (PCs) was also achieved on the ATK cluster, and 27x on the larger UMIA system. The AMD server achieved up to a 6x speedup for parallel processing compared to only 1.6a; for Intel-based platforms resulting in a 2x best rate for AMD compared to Intel. Computer science analysis of the low-latency AMD platform compared to the less expensive Intel architecture explains the enhanced AMD performance for EM FDTD-PIC.
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