openMPI 4.1 #23
Description
17/10/2022
Known problem with openMPI 4.1:
Using MPI for input and output, the 'internal' MPI data representation gives wrong file size.
File reading is affected as well (wrong input file read).
Clusters affected by the problem:
-Discoverer. The problem involes the standalone version of openMPI, the one included in the Nvidia hpc-sdk suite is not affected by the problem (Inded, the openMPI version included in hpc-sdk 22.7 should be the 4.0).
-VSC-5, Same problem as in Discoverer, using openMPI 4.1, the resulting input/output are not read/written correctly.
Fix (to be included in the compile.sh):
Use the 'native' data format insetad of 'internal'.
Suborutines that need to be modified:
-write_output.f90
-read_fields.90
24/07/2024
Problems solved, all MPI I/O operations are performed in Native mode.