[Mpi-forum] user-defined reductions and re-entrancy

[Jeff Squyres (jsquyres)]

On Oct 20, 2015, at 2:04 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
> 
> Thanks Jed for clarifying. I agree with your modified example. 
> 
> The fundamental question here remains: can an implementation internally call user-defined reduction operators from multiple threads at the same time?

I don't think that the MPI spec defines this.

-- 
Jeff Squyres
jsquyres at cisco.com
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