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by _htor_ on 2011-07-15 16:34:54 -0500**\n\n___\nAuthor: James Dinan and Torsten Hoefler\n\n## Description\n\nSharing memory between MPI processes can provide several benefits, especially in multi-core environments. We propose to add an API to the One Sided chapter to allow for sharing memory in a portable way.\n\n## History\n\nThis idea was first brought up by T. Hoefler in the RMA and Hybrid WGs (see email from 15.03.2011) and then refined by J. Dinan to provide a shared memory segment per calling process.\n\n## Proposed Solution\n\nDefine a new call MPI_Win_allocate_shared that allocates a shared window. See the attached proposal for details. See attached coll.pdf.\n\nConstants that affect other places in the document are:\n - add MPI_WIN_FLAVOR_SHARED to table Predefined Attribute Keys on page 521 (MPI-2.2)\n - add MPI_ALLOCATE_SHARED, MPI_WIN_SHARED_QUERY to A.2 and A.3\n\n## Impact on Implementations\n\nAn unoptimized and scalable implementation is relatively simple. \n\n## Impact on Applications / Users\n\nThis is additional functionality than allows to allocate and access shared memory. \n\n## Alternative Solutions\n\nSee past discussions in the Hybrid WG.\n\n## Entry for the Change Log\n\nAdded MPI_Win_allocate_shared."},"comment":{"url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/comments/234788578","html_url":"https://github.com/mpiforumbot/mpi-forum-historic/issues/284#issuecomment-234788578","issue_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/284","id":234788578,"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":"2016-07-24T17:00:38Z","updated_at":"2016-07-24T17:00:38Z","body":"**Originally by _potluri_ on 2012-07-17 22:31:11 -0500**\n\n___\nreviewed disp_unit related changes in the report posted above"}}
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