Developments concerning the parallel input and output (IO) in the parallel version of UnTRIM with a special attention for its efficiency are presented. The usage of MPI IO (developed ca. 2010) and of the highly specialised libraries like HDF5 or NetCDF (developments in 2018 and 2019) is discussed and assessed from the point of view of engineering practice and the efficiency of parallel IO systems ubiquitous in the present-day high performance computers.

Transparencies for a talk presented on 16th UnTRIM Workshop held in Trento, 13-15th May 2019 are available.