{"action":"created","issue":{"url":"https://api.github.com/repos/trilinos/Trilinos/issues/877","repository_url":"https://api.github.com/repos/trilinos/Trilinos","labels_url":"https://api.github.com/repos/trilinos/Trilinos/issues/877/labels{/name}","comments_url":"https://api.github.com/repos/trilinos/Trilinos/issues/877/comments","events_url":"https://api.github.com/repos/trilinos/Trilinos/issues/877/events","html_url":"https://github.com/trilinos/Trilinos/issues/877","id":190860525,"number":877,"title":"Tpetra::CrsMatrix: Optimize sumIntoLocalValues for common case where input is shorter than # entries in matrix 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\r\nCC: @crtrott, @nmhamster \r\n\r\n  1. Strip-mine input indices and values by some small compile-time constant K (e.g., 8)\r\n  2. Copy those K indices and values into a temporary buffer of length K\r\n  3. Sort the indices and values jointly by indices (Tpetra::sort2 or equivalent algorithm)\r\n  4. Use (sorted, sorted) search (different than findRelOffset) so that you pass over the entries in the matrix's row at most once\r\n"},"comment":{"url":"https://api.github.com/repos/trilinos/Trilinos/issues/comments/262144377","html_url":"https://github.com/trilinos/Trilinos/issues/877#issuecomment-262144377","issue_url":"https://api.github.com/repos/trilinos/Trilinos/issues/877","id":262144377,"user":{"login":"nmhamster","id":8905126,"avatar_url":"https://avatars.githubusercontent.com/u/8905126?v=3","gravatar_id":"","url":"https://api.github.com/users/nmhamster","html_url":"https://github.com/nmhamster","followers_url":"https://api.github.com/users/nmhamster/followers","following_url":"https://api.github.com/users/nmhamster/following{/other_user}","gists_url":"https://api.github.com/users/nmhamster/gists{/gist_id}","starred_url":"https://api.github.com/users/nmhamster/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nmhamster/subscriptions","organizations_url":"https://api.github.com/users/nmhamster/orgs","repos_url":"https://api.github.com/users/nmhamster/repos","events_url":"https://api.github.com/users/nmhamster/events{/privacy}","received_events_url":"https://api.github.com/users/nmhamster/received_events","type":"User","site_admin":false},"created_at":"2016-11-22T04:24:41Z","updated_at":"2016-11-22T04:24:41Z","body":"@mhoemmen we might be able to produce very fast intrinsics based variants for KNL and Haswell. I think you might want to consider some form of preprocessor definitions around this call so we can drop in the faster variants if we can work them out?"}}
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