| 1 |
Computation of numerical method is inherently iterative: at each time step, the solution depends on the immediately preceding one.
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| 2 |
At each time step, MPGrav is called (several times as using Runge Kutta):
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For each particle i, one must sum over the forces due to all other particles j.
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Computation is O(N2) - there is a potential for parallel computation in either i (normal case in standard Message Parallel) or j or both.
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| 3 |
We will use 4th order Runge Kutta to integrate in time and the program is designed an overall routine looping over time with parallelism hidden in MPGrav routines
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| 4 |
We analyse Message Parallel version and other foils discuss Data Parallel version
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