Each predefined MPI datatype is mapped to a standard type. The table
that defines this relation can be found in the MPI Standard (2.2) in
Annex A page 534.
george.
On Nov 23, 2009, at 16:49 , Natarajan CS wrote:
Oh okay that explains the behaviour of MPI_SHORT, guess sizeof is
going to give me the same value no matter what MPI_Datatype I use?
Thanks for the quick response!
On Mon, Nov 23, 2009 at 2:33 PM, Edmund Sumbar <esum...@ualberta.ca>
wrote:
On Mon, 23 Nov 2009, Natarajan CS wrote:
[...]
1) When I use MPI_SHORT instead of short to count the number of data
transferred I get an array that is half the size. (ie MPI_Isend
(&data2[0][0][0], (int) (sizeof(data2)/sizeof(MPI_SHORT)),
MPI_SHORT, rank, 123,
cartcomm,&request[rank-1]);
MPI_SHORT and the other data types are actually macros that resolve
to MPI_Datatype which is a pointer to a struct.
[...]
--
Edmund Sumbar
AICT Research Support Group
esum...@ualberta.ca
780.492.9360
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