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Makefile

Remove -pthread if the app does not use pthread.

Remove -Wall to disable warnings

Update nr of processors (8 in this example)

–oversubscribe - allow more processors than physically available

<code Makefile> build:

mpicc -o helloapp helloapp.c -pthread -Wall

run:

      mpirun -np 8 --oversubscribe helloapp

clean:

rm -f helloapp