[Mpi3-rma] MPI_NO_OP and origin buffer

[Torsten Hoefler]

All, 

So it may be fine for some accumulate ops but not for all because
MPI_Accumulate with MPI_NO_OP was our back-door to get an atomic put.
Thanks to Keith for pointing this out!

Thanks,
  Torsten

On Fri, Sep 07, 2012 at 04:40:54PM -0500, Torsten Hoefler wrote:
> Hi Jim,
> 
> I agree, that is a reasonable change.
> 
> Best,
>   Torsten
> 
> On Thu, Sep 06, 2012 at 10:48:47AM -0500, James Dinan wrote:
> > Hi All,
> >
> > It looks like we forgot to specify that for MPI_NO_OP in the new  
> > accumulate ops, the origin buffer is ignored (i.e. it's acceptable to  
> > pass NULL).  We can add this text on page 441, line 30:
> >
> > When MPI_NO_OP is specified, the origin buffer is ignored.
> >
> > We already have such a use case in the linked list example.
> >
> >  ~Jim.
> > _______________________________________________
> > mpi3-rma mailing list
> > mpi3-rma at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma
> >
> 
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> 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
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-- 
### 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