Reply To: load coarse mesh data to a fine mesh
You should not need the communicateToAllflags here, overlap communication (to ensure the interpolation stencil has the correct neighbor information) is enough. This all relies on the exact same block decomposition being used between the resolutions (s.t. both the coarse and fine information for any given cell reside on the same process). Can you confirm whether your code works (for a smaller resolution) on a single process / detail the way you execute this?