I suspect the info hint nowildcards=true would be useful for some implementations. Note also the MPI_Comm_dup_info call; its not just split_type. Bill William Gropp Director, Parallel Computing Institute Deputy Director for Research Institute for Advanced Computing Applications and Technologies Paul and Cynthia Saylor Professor of Computer Science University of Illinois Urbana-Champaign On Jul 18, 2012, at 2:43 PM, MPI Forum wrote:

#286: Noncollective Communicator Creation -------------------------------------+------------------------------------- Reporter: jdinan | Owner: Type: New | jdinan routine(s) | Status: Priority: Passed | assigned Version: MPI | Milestone: 3.0 | 2012/05/28 Japan Keywords: | Resolution: communicators | Implementation status: Author: Bill Gropp: 0 | Completed Author: Adam Moody: 0 | Author: Rich Graham: 0 Author: Dick Treumann: 0 | Author: Torsten Hoefler: 0 Author: George Bosilca: 0 | Author: Jesper Larsson Traeff: 0 Author: Bronis de Supinski: 0 | Author: David Solt: 0 Author: Jeff Squyres: 0 | Author: Rajeev Thakur: 0 Author: Rolf Rabenseifner: 0 | Author: Alexander Supalov: 0 -------------------------------------+-------------------------------------

Comment (by jdinan):

I don't think we ever had a use case for the info argument, so we never added it. The info key in MPI_Comm_split_type was added to allow the user to specify machine topology hints.

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