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This was tricky to track down because the program would only stall for certain numbers of communicators, and later than the call actually causing the issue. For future reference, always check that the chunk sizes are identical between MPI ranks!
At the request of the developers, making this change so that users do not need to have HDF5 installed to compile FARGO3D. If the option is selected, the appropriate source file and library are added to the build.
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HDF5 is a high-performance I/O library for scientific data. This output module produces exactly one file per run of FARGO3D, with optional compression, in an easy-to-use structured format. It includes all the time-varying fluid fields for all fluids (in the multifluid version), metadata for every array (shape and data type), and all the parameter values used in the run, attached at the root node as attributes. Combined with the Python bindings for HDF5, this has made analyzing output from my runs significantly easier. I hope it can be of use to someone else, and I'm happy to continue developing on this feature branch if the developers are interested in the new functionality.