[Mpi3-rma] MPI_Fetch_and_op and predefined datatypes
jhammond at alcf.anl.gov
Sat Oct 27 09:05:06 CDT 2012
If someone wants MPI_NO_OP or MPI_REPLACE on MPI_WCHAR, can't they
just do it with MPI_Get_accumulate on the appropriate width using
MPI_BYTE and MPI_SIZEOF?
I see no performance-critical justification for MPI_WCHAR atomic reads
On Fri, Oct 26, 2012 at 4:07 PM, Torsten Hoefler <htor at illinois.edu> wrote:
> On Fri, Oct 26, 2012 at 04:22:02PM -0500, Jeff Hammond wrote:
>> I don't want to wait for 3.1. Are we seriously going to require
>> MPI_WCHAR support in F&Op to be MPI-3 compliant? That makes no sense.
> I think the intent of "Any of the predefined operations for MPI_REDUCE,
> as well as MPI_NO_OP or MPI_REPLACE, can be specified as op;
> user-defined functions cannot be used." is clear. One could even dream
> up a use-case for MPI_WCHAR if one wants to emulate an atomic read
> (using MPI_NO_OP).
> I will not vote against an errata if you want to propose text and
> initiate the process.
> ### qreharg rug ebs fv crryF ------------- http://www.unixer.de/ -----
> Torsten Hoefler | Assistant Professor
> Dept. of Computer Science | ETH Zürich
> Universitätsstrasse 6 | Zurich-8092, Switzerland
> CAB E 64.1 | Phone: +41 76 309 79 29
> mpi3-rma mailing list
> mpi3-rma at lists.mpi-forum.org
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
More information about the mpiwg-rma