MPI datatype C datatype
MPI CHAR signed char
MPI SHORT signed short int
MPI INT signed int
MPI LONG signed long int
MPI UNSIGNED CHAR unsigned char
MPI UNSIGNED SHORT unsigned short int
MPI UNSIGNED unsigned int
MPI UNSIGNED LONG unsigned long int
MPI FLOAT float
MPI DOUBLE double
MPI LONG DOUBLE long double
MPI BYTE (force no
conversion between different
reresentations)
MPI PACKED
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