问题
Is there such a thing as a custom datatype in MPI, or do you have to flatten everything into a text string and pass as MPI_CHAR? If you are required to flatten everything, is there a built-in function I am overlooking?
回答1:
The answer is MPI_Type_contiguous (the link is to the documentation). It allows you to block out a specific amount of space based on basic data types, and their respective offsets.
回答2:
A much better answer is MPI_Type_create_struct. It allows you to replicate your struct datatype and pass it around, there is a great example of it's use at DeinoMPI.
来源：https://stackoverflow.com/questions/10066628/custom-datatype-mpi-datatype-datatype