at a given point in my (Fortran90) program, I write:
start_time = MPI_Wtime()
new_time = MPI_Wtime() - start_time
write(*,*) "barrier time =",new_time
and then I run my code...
I expected that the values of "new_time" would range from 0 to Tmax (1700 in my case)
As I understand it, the first process that hits the barrier should print Tmax and the last process that hits the barrier should print 0 (or a very low value).
But this is not the case: all processes print values in the range 1400-1700!
This small code behaves perfectly in other parts of my code...