I'm confused. Maybe I'm stupid, but I didn't even understand what the supposedly better "other way" is. The MPI codes I've seen are scientific codes where the

I'm confused. Maybe I'm stupid, but I didn't even understand what the supposedly better "other way" is. The MPI codes I've seen are scientific codes where the data is a large domain that can only fit distributed across many nodes, and where there are interactions that must be passed between these. Typical examples are hydrodynamics codes, N-body codes, radiation transfer codes, or combinations thereof. Can someone explain to me in an understandable way how they think these applications should be coded?