# Benchmarking MPI performance
# Scale number of processors
mpirun -np 1 ./heat -e 0.0001 -s 8000 -b h -n 800
Terminated after 3470 steps.  Max. difference = 0.000100
4.05 seconds.  2220800000 grid point computations.  nanoseconds/comp. = 1.82
mpirun -np 2 ./heat -e 0.0001 -s 8000 -b h -n 800
Terminated after 3470 steps.  Max. difference = 0.000100
2.67 seconds.  2220800000 grid point computations.  nanoseconds/comp. = 1.20
mpirun -np 4 ./heat -e 0.0001 -s 8000 -b h -n 800
Terminated after 3470 steps.  Max. difference = 0.000100
1.09 seconds.  2220800000 grid point computations.  nanoseconds/comp. = 0.49
mpirun -np 8 ./heat -e 0.0001 -s 8000 -b h -n 800
Terminated after 3470 steps.  Max. difference = 0.000100
0.66 seconds.  2220800000 grid point computations.  nanoseconds/comp. = 0.30
# Scale problem size
mpirun -np 8 ./heat -e 0.0001 -s 8000 -b h -n 1600
Terminated after 3534 steps.  Max. difference = 0.000100
6.51 seconds.  9047040000 grid point computations.  nanoseconds/comp. = 0.72
mpirun -np 8 ./heat -e 0.0001 -s 8000 -b h -n 3200
Terminated after 3567 steps.  Max. difference = 0.000100
36.07 seconds.  36526080000 grid point computations.  nanoseconds/comp. = 0.99
mpirun -np 8 ./heat -e 0.0001 -s 8000 -b h -n 6400
Terminated after 3584 steps.  Max. difference = 0.000100
128.98 seconds.  146800640000 grid point computations.  nanoseconds/comp. = 0.88