_by_slowest time metric doesn't consider MPI operations
Unlike the other methods of estimating elapsed I/O time in Darshan, the "_by_slowest" method only counts POSIX time, even if the file was opened using MPI-IO.
Unlike the other methods of estimating elapsed I/O time in Darshan, the "_by_slowest" method only counts POSIX time, even if the file was opened using MPI-IO.