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I have a very basic question about MPI.
I have a computer with 8 processors (each with 8 cores). What is the difference between if I run a program simply by "./program" and "mpirun -np 8 /path/to/program" ? In the first case does the program just use one processor out of the 8? If I want the program to use all the 8 processors at the same time, then I have to do with mpirun?
Something fundamental is buggin me.