Dear all, thanks to you all for your many feedback that we received for this proposal. Based on that, I updated the issue #120    MPI_Cart_weighted_create / Topology aware Cartesian communicators    https://github.com/mpi-forum/mpi-issues/issues/120 for reading at September Meeting 2019 in Zürich. For a full pdf of the proposal with changebars, see    https://github.com/mpi-forum/mpi-issues/files/3512431/mpi32-report-topol-201... The pull request is at     https://github.com/mpi-forum/mpi-standard/pull/98 A portable and complete implementation together with documentation can be found on the issue and also on our EuroMPI 2018 directory:    https://fs.hlrs.de/projects/par/mpi/EuroMPI2018-Cartesian/ There will be also a paper presentation at the EuroMPI conference. Because I'm on travel next week with very limited email-access, I send out this email very early and a bit uncoordinated - my apologies. Best regards Rolf -- Dr. Rolf Rabenseifner . . . . . . . . . .. email [email protected] . High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 . University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 . Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner . Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307) .