Basic HTML version of Foils prepared August 15 98

Foil 99 Example: Red-black iteration

From Java Grande: Role of Java in Large Scale Computations NPACI Summer Institute on Parallel Computing -- August 21 98. by Geoffrey C. Fox
Procs p = new Procs2(NP, NP) ;
on(p) {
Range x = new BlockRange(N, p.dim(0), 1) ; // ghost width 1
Range y = new BlockRange(N, p.dim(1), 1) ; // ...
float [[,]] u = new float [[x, y]] ;
for(int parity = 0 ; parity < 2 ; parity++) { // red and black
Adlib.writeHalo(u, widths) ; // Communicate Ghost Cells
overall(i = x [1 : N - 2])
overall(j = y [1 + (x.idx(i) + parity) % 2 : N - 2 : 2])
u [i, j] = 0.25 * (u [i - 1, j] + u [i + 1, j] +
u [i, j - 1] + u [i, j + 1]) ;
}
}

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