Its C bindings and if I clear the picture a bit more, what it does is partitioning the original matrix in to a set of sub matrices to be processed by the a other processes. And it seems that the only option left is to bundle off in to a temp buffer before sending as you have suggested. It would have been nice if there was a derived data type to do the trick :) ?
Which language bindings?
For Fortran, consider pack or reshape. (I *think* whether array
sections are bundled off into temporary, contiguous storage is
Isn't it easier to broadcast the size first?
On Tue, 2009-07-21 at 11:53 +0530, Prasadcse Perera wrote:
> Hi all,
> I'm writing an application which requires sending some variable size
> of sub matrices to a set of processes by a lead process who holds the
> original matrix. Here, the matrices are square matrices and the
> receiving process doesn't know the size of the receiving matrix. In
> MPI_Bcast, I have seen that we can broadcast a whole matrix. Is there
> a similar way to do this with a derived data type for the matrices
> which we can send a matrix without looping the blocks ?.
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