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Menlo 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by _balaji_ on 2008-10-14 00:15:18 -0500**\n\n___\n## Background\n\nThe MPI 2.1 standard does not explicitly mention whether it is\npermitted for one process in an application to initialize with a\ndifferent thread-level than another.\n\n## Proposed Solution\n\nAdd an explicit statement in the proposal mentioning the permitted\nrules one-way or another.\n\nClarification is needed for two cases: (1) whether one process can\ncall MPI_Init() and another MPI_Init_thread() (i.e. are these calls\ncollective?), and (2) if processes all call MPI_Init_thread(), can\nthey ask for different thread levels?\n\n## Impact on Implementations\n\n-*If different thread-levels are allowed:** For implementations\nwhich use different algorithms (that impact the remote processes)\nbased on the threading level specified, this will require\nsynchronization between the processes to decide which algorithm to\nuse. For other implementations, there will not be any change.\n\n-*If different thread-levels are not allowed:** No impact on\nimplementations.\n\n## Impact on Applications/Users\n\nIf an application was using the same thread-level for all processes,\nit will need no changes.\n\nFor other applications, if we decide to disallow such usage, it will\nexplicitly be a MPI non-compilant application.\n"},"comment":{"url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/comments/234752028","html_url":"https://github.com/mpiforumbot/mpi-forum-historic/issues/36#issuecomment-234752028","issue_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/36","id":234752028,"user":{"login":"mpiforumbot","id":20617676,"avatar_url":"https://avatars.githubusercontent.com/u/20617676?v=3","gravatar_id":"","url":"https://api.github.com/users/mpiforumbot","html_url":"https://github.com/mpiforumbot","followers_url":"https://api.github.com/users/mpiforumbot/followers","following_url":"https://api.github.com/users/mpiforumbot/following{/other_user}","gists_url":"https://api.github.com/users/mpiforumbot/gists{/gist_id}","starred_url":"https://api.github.com/users/mpiforumbot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mpiforumbot/subscriptions","organizations_url":"https://api.github.com/users/mpiforumbot/orgs","repos_url":"https://api.github.com/users/mpiforumbot/repos","events_url":"https://api.github.com/users/mpiforumbot/events{/privacy}","received_events_url":"https://api.github.com/users/mpiforumbot/received_events","type":"User","site_admin":false},"created_at":"2016-07-24T01:59:18Z","updated_at":"2016-07-24T01:59:18Z","body":"**Originally by _gropp_ on 2008-10-26 10:38:49 -0500**\n\n___\nSpecific proposed text changes are needed."}}
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