On Jun 23, 2016, at 8:20 AM, Saliya Ekanayake <esal...@gmail.com> wrote: > > I've got a quick question. Besides theses time sharing constraints, does > number of cores has any significance to MPI's communication decisions?
Open MPI doesn't use the number of cores available to it in any calculations / algorithm selection in the MPI layer. The locality of the running thread may have an impact on performance (and/or algorithm selection), though. E.g., if a thread is accidentally accessing NUMA-remote memory. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
