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Foil 39 Some Inefficiencies of the Data Parallel N2 Algorithm - II

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- 1998 Enhancements. by Geoffrey C. Fox
1 Also, all particle information is sent to all processors, taking O(N2) space whereas natural algorithms use O(N) space and this is how special purpose machines like GRAPE get their cost effectiveness
  • If N is one million as for globular cluster problem, there is a big difference between DRAM cost of 106 and 1012 units of memory
2 Space is further wasted as everything is spread to 3 dimensional arrays even when arrays like mass are naturally one dimensional!
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