/usr/local/src/mpich/bin/mpirun -np 2 ping 1 10000 100001 -loops=1000
Sender iterating for 1...100001 +=10000 (11 values)
1	6.980013
10001	3.134019
20001	1.544798
30001	1.715063
40001	10.670138
50001	34.938836
60001	49.658165
70001	49.573623
80001	49.855905
90001	50.013913
100001	50.062812