Error when leaving the define mode

[Jin-De Huang]

Hi all Pnetcdf developers,

I am testing my model with 2304 processes on a supercluster with the
Fujitsu Fortran compiler and Pnetcdf 1.12.1. The model halted when leaving
the define mode. The error message only appeared in the log files that MPI
ranks are greater than 2047.

MPI error (MPI_File_read_at_all) : MPI_ERR_ARG: invalid argument of some
other kind

Some problems happened in these processes, but the error codes from each
Pnetcdf function were 0 until the above error message appeared. As I used
the number of processes less than 2048, the model worked normally. I have
no idea to solve this problem. Is it any way to identify the reason for
this problem?

Thanks,
Jin-De Huang
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