#cores  wall_clock[s]/iteration	Parallel eff. [%]  gridpts/MPI rank
 144        3.442712                  100               111132
 288        1.730006                  100               55666
 576        0.860678                  100               27783
1296        0.394740                   95               12348
2592        0.213434                   82                6174
5184        0.130994                   67                3087