•This is illustrated in the following diagram by the pink dotted line, which encircles the grid points owned by the corresponding processor. The grid points in the top processor row have been labeled (and color coded) by the grid number i of the problem P(i) in which they participate. There is exactly one point labeled 2 per processor. The only grid point in P(1) with a nonboundary value is owned by the processor above the one with the pink dotted line. In general, if p>=16, there will be
.5*log_2(p)-1 grids P(i) in which
fewer than all processor own
participating grid points.
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