clock_prec        183 test/datatype/to_self.c     double bandwidth, clock_prec;
clock_prec        185 test/datatype/to_self.c     clock_prec = MPI_Wtick();
clock_prec        186 test/datatype/to_self.c     bandwidth = (length * clock_prec * cycles) / (1024.0 * 1024.0) / (time * clock_prec);