Parallel Guard Rings in One Dimension

Now we decompose our 16 points (trivial example) into four groups and put 4 points in each processor

Instead of dimensioning PHI(4) in each processor, one dimensions PHI(6) and runs loops from 2 to 5 with either boundary values or communication setting values of end-points

Sequential:

Parallel:

PHI(6) for Processor 1

Now we decompose our 16 points (trivial example) into four groups and put 4 points in each processor