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Problem\r\n\r\nFor 64-bit clean functionality, convenience, and symmetry, the Big MPI principles being applied in Ticket #80 to collective operations should be applied to MPI more widely.  In this case, we consider the idea that you might want more than 2^31 MPI ranks, hence needing a new data type, MPI_Rank.\r\n\r\n# Proposal\r\n\r\nMPI needs to be 64-bit clean throughout.  \r\n\r\n# Changes to the Text\r\n\r\nMPI_Rank will replace int for ranks;   support > 2^31 MPI processes in a communicator.\r\n\r\nA separate ticket considers MPI_Count and miscellaneous concerns for point-to-point.\r\n\r\n# Impact on Implementations\r\n\r\nNo current API is impacted.  New _X APIs for all point-to-point operations affected will be needed.\r\n\r\nMPI implementations will have to be 64-bit clean inside since count*extent > 2^31 is already problematic for some implementations.  New APIs will have to be added and the internals of MPI will have to be 64-bit capable for buffers and related issues.\r\n\r\n# Impact on Users\r\n\r\nUsers who opt in with the new API will be able to have communicators larger than 2^31. [MPI_Rank]\r\n\r\n# References\r\n\r\nSee also Ticket #80, #98, #99, #100"},"comment":{"url":"https://api.github.com/repos/mpi-forum/mpi-issues/issues/comments/397391139","html_url":"https://github.com/mpi-forum/mpi-issues/issues/97#issuecomment-397391139","issue_url":"https://api.github.com/repos/mpi-forum/mpi-issues/issues/97","id":397391139,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NzM5MTEzOQ==","user":{"login":"jeffhammond","id":406118,"node_id":"MDQ6VXNlcjQwNjExOA==","avatar_url":"https://avatars2.githubusercontent.com/u/406118?v=4","gravatar_id":"","url":"https://api.github.com/users/jeffhammond","html_url":"https://github.com/jeffhammond","followers_url":"https://api.github.com/users/jeffhammond/followers","following_url":"https://api.github.com/users/jeffhammond/following{/other_user}","gists_url":"https://api.github.com/users/jeffhammond/gists{/gist_id}","starred_url":"https://api.github.com/users/jeffhammond/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jeffhammond/subscriptions","organizations_url":"https://api.github.com/users/jeffhammond/orgs","repos_url":"https://api.github.com/users/jeffhammond/repos","events_url":"https://api.github.com/users/jeffhammond/events{/privacy}","received_events_url":"https://api.github.com/users/jeffhammond/received_events","type":"User","site_admin":false},"created_at":"2018-06-14T18:19:48Z","updated_at":"2018-06-14T18:19:48Z","author_association":"MEMBER","body":"Breaking user code is the bigger issue. Please describe how you’ll address that."}}
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