The types MPI_SIGNED_CHAR and MPI_UNSIGNED_CHAR can be
used in reduction operations. MPI_CHAR,
MPI_WCHAR, and MPI_CHARACTER (which represent printable
characters) cannot be used in reduction operations.
In a heterogeneous environment,
MPI_CHAR, MPI_WCHAR, and MPI_CHARACTER
will be translated so as to preserve the printable character, whereas
MPI_SIGNED_CHAR and MPI_UNSIGNED_CHAR will be
translated so as to preserve the integer value.
The types MPI_CHAR, MPI_WCHAR, and MPI_CHARACTER are intended for
characters, and so will be translated to preserve the printable
representation, rather than the integer value, if sent between machines with
different character codes. The types MPI_SIGNED_CHAR and
MPI_UNSIGNED_CHAR should be used in C if the integer value
should be preserved.
( End of advice to users.)
Advice to users.
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