We compiled a single program -- we didn't compile a different program for each process-- and we did this in spite of the fact that process 0 is doing something fundamentally different from the other process. This is quite common in parallel programming. In fact, most MPI programs are written in this way. That is, single program is written so that different processes carry out different actions, and this is achieved by simply having the processes branch on the basis of their process rank. (SPMD) Single Program multiple data.
--An introduction to Parallel Programming,
Peter S. Pacheco
University of San Francisco
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