[mpiwg-tools] Questions for the tools community

Jeff Squyres (jsquyres) jsquyres at cisco.com
Thu Aug 29 09:46:00 CDT 2019

Should I infer from the lack of reply that no tools properly handle either Fortran descriptors or the descriptor-based symbols?

> On Aug 25, 2019, at 11:31 AM, Jeff Squyres (jsquyres) via mpiwg-tools <mpiwg-tools at lists.mpi-forum.org> wrote:
> In Open MPI, we are finally working towards supporting Fortran descriptors for choice buffers (i.e., "TYPE(*), DIMENSION(..)").
> Per MPI-3.1 p613 table 17.1, this means ***changing all the back-end symbols*** that are used for PMPI-style interception.
> A concrete example:
> - in mpif.h / the mpi module, MPI_SEND will become MPI_SEND_FTS
> - in the mpi_f08 module, MPI_SEND will become MPI_SEND_F08TS
> I.e., anywhere the application calls MPI_SEND, it will be transmogrified to either MPI_SEND_FTS or MPI_SEND_F08TS.  And the choice buffer passed will be a descriptor (which may therefore be a subarray, not a contiguous buffer), not a naked pointer.
> Here's my questions:
> 1. Do any tools support Fortran descriptors as choice buffers?
> 2. Do any tools intercept the symbols as described in MPI-3.1 table 17.1?
> -- 
> Jeff Squyres
> jsquyres at cisco.com
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Jeff Squyres
jsquyres at cisco.com

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