{"action":"created","issue":{"url":"https://api.github.com/repos/chapel-lang/chapel/issues/7852","repository_url":"https://api.github.com/repos/chapel-lang/chapel","labels_url":"https://api.github.com/repos/chapel-lang/chapel/issues/7852/labels{/name}","comments_url":"https://api.github.com/repos/chapel-lang/chapel/issues/7852/comments","events_url":"https://api.github.com/repos/chapel-lang/chapel/issues/7852/events","html_url":"https://github.com/chapel-lang/chapel/issues/7852","id":275889388,"number":7852,"title":"Stream performance is slightly worse when registering memory under ugni","user":{"login":"ronawho","id":1588337,"avatar_url":"https://avatars1.githubusercontent.com/u/1588337?v=4","gravatar_id":"","url":"https://api.github.com/users/ronawho","html_url":"https://github.com/ronawho","followers_url":"https://api.github.com/users/ronawho/followers","following_url":"https://api.github.com/users/ronawho/following{/other_user}","gists_url":"https://api.github.com/users/ronawho/gists{/gist_id}","starred_url":"https://api.github.com/users/ronawho/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ronawho/subscriptions","organizations_url":"https://api.github.com/users/ronawho/orgs","repos_url":"https://api.github.com/users/ronawho/repos","events_url":"https://api.github.com/users/ronawho/events{/privacy}","received_events_url":"https://api.github.com/users/ronawho/received_events","type":"User","site_admin":false},"labels":[{"id":496591153,"url":"https://api.github.com/repos/chapel-lang/chapel/labels/area:%20Runtime","name":"area: 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registering the heap under ugni (when a hugepage module is loaded) performance is slightly worse compared to when no registration is done (or with comm=none or gn-mpi)\r\n\r\nNote that dynamic registration (https://github.com/chapel-lang/chapel/pull/6947) significantly improved affinity and stream performance, but we're still slightly behind where we want to be:\r\n\r\n| config      | stream-ep perf |\r\n| ----------- | -------------- |\r\n| comm=none   |     ~97.5 GB/s |\r\n| ugni w/ HP  |     ~95.0 GB/s |\r\n| ugni w/o HP |     ~97.5 GB/s |\r\n\r\n\r\n\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/chapel-lang/chapel/issues/comments/347696216","html_url":"https://github.com/chapel-lang/chapel/issues/7852#issuecomment-347696216","issue_url":"https://api.github.com/repos/chapel-lang/chapel/issues/7852","id":347696216,"user":{"login":"gbtitus","id":7740880,"avatar_url":"https://avatars3.githubusercontent.com/u/7740880?v=4","gravatar_id":"","url":"https://api.github.com/users/gbtitus","html_url":"https://github.com/gbtitus","followers_url":"https://api.github.com/users/gbtitus/followers","following_url":"https://api.github.com/users/gbtitus/following{/other_user}","gists_url":"https://api.github.com/users/gbtitus/gists{/gist_id}","starred_url":"https://api.github.com/users/gbtitus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gbtitus/subscriptions","organizations_url":"https://api.github.com/users/gbtitus/orgs","repos_url":"https://api.github.com/users/gbtitus/repos","events_url":"https://api.github.com/users/gbtitus/events{/privacy}","received_events_url":"https://api.github.com/users/gbtitus/received_events","type":"User","site_admin":false},"created_at":"2017-11-28T23:13:57Z","updated_at":"2017-11-28T23:13:57Z","author_association":"OWNER","body":"In the past I've hacked the generated code to check the affinity of the array memory each task works with.  That might be necessary here, as a next step.  One or more tasks must be working with non-NUMA-local array memory."}}
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