{"action":"closed","issue":{"url":"https://api.github.com/repos/arbor-sim/arbor/issues/213","repository_url":"https://api.github.com/repos/arbor-sim/arbor","labels_url":"https://api.github.com/repos/arbor-sim/arbor/issues/213/labels{/name}","comments_url":"https://api.github.com/repos/arbor-sim/arbor/issues/213/comments","events_url":"https://api.github.com/repos/arbor-sim/arbor/issues/213/events","html_url":"https://github.com/arbor-sim/arbor/issues/213","id":217810772,"node_id":"MDU6SXNzdWUyMTc4MTA3NzI=","number":213,"title":"Add MPI support for dry run mode","user":{"login":"bcumming","id":384605,"node_id":"MDQ6VXNlcjM4NDYwNQ==","avatar_url":"https://avatars0.githubusercontent.com/u/384605?v=4","gravatar_id":"","url":"https://api.github.com/users/bcumming","html_url":"https://github.com/bcumming","followers_url":"https://api.github.com/users/bcumming/followers","following_url":"https://api.github.com/users/bcumming/following{/other_user}","gists_url":"https://api.github.com/users/bcumming/gists{/gist_id}","starred_url":"https://api.github.com/users/bcumming/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bcumming/subscriptions","organizations_url":"https://api.github.com/users/bcumming/orgs","repos_url":"https://api.github.com/users/bcumming/repos","events_url":"https://api.github.com/users/bcumming/events{/privacy}","received_events_url":"https://api.github.com/users/bcumming/received_events","type":"User","site_admin":false},"labels":[{"id":454180546,"node_id":"MDU6TGFiZWw0NTQxODA1NDY=","url":"https://api.github.com/repos/arbor-sim/arbor/labels/enhancement","name":"enhancement","color":"84b6eb","default":true}],"state":"closed","locked":false,"assignee":{"login":"bcumming","id":384605,"node_id":"MDQ6VXNlcjM4NDYwNQ==","avatar_url":"https://avatars0.githubusercontent.com/u/384605?v=4","gravatar_id":"","url":"https://api.github.com/users/bcumming","html_url":"https://github.com/bcumming","followers_url":"https://api.github.com/users/bcumming/followers","following_url":"https://api.github.com/users/bcumming/following{/other_user}","gists_url":"https://api.github.com/users/bcumming/gists{/gist_id}","starred_url":"https://api.github.com/users/bcumming/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bcumming/subscriptions","organizations_url":"https://api.github.com/users/bcumming/orgs","repos_url":"https://api.github.com/users/bcumming/repos","events_url":"https://api.github.com/users/bcumming/events{/privacy}","received_events_url":"https://api.github.com/users/bcumming/received_events","type":"User","site_admin":false},"assignees":[{"login":"bcumming","id":384605,"node_id":"MDQ6VXNlcjM4NDYwNQ==","avatar_url":"https://avatars0.githubusercontent.com/u/384605?v=4","gravatar_id":"","url":"https://api.github.com/users/bcumming","html_url":"https://github.com/bcumming","followers_url":"https://api.github.com/users/bcumming/followers","following_url":"https://api.github.com/users/bcumming/following{/other_user}","gists_url":"https://api.github.com/users/bcumming/gists{/gist_id}","starred_url":"https://api.github.com/users/bcumming/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bcumming/subscriptions","organizations_url":"https://api.github.com/users/bcumming/orgs","repos_url":"https://api.github.com/users/bcumming/repos","events_url":"https://api.github.com/users/bcumming/events{/privacy}","received_events_url":"https://api.github.com/users/bcumming/received_events","type":"User","site_admin":false}],"milestone":null,"comments":3,"created_at":"2017-03-29T09:06:51Z","updated_at":"2018-10-29T15:27:59Z","closed_at":"2018-10-29T15:27:59Z","author_association":"MEMBER","body":"Currently the dry run mode performs simulation on a single domain, which corresponds to an MPI rank for the MPI global communication back end. This is an appropriate abstraction when using 1 MPI rank per node, however it can't be used to gain insight into performance when there is more than 1 MPI rank per node.\r\n\r\nSuch scenarios include\r\n* 1 MPI rank per CPU core on a multi-core system\r\n* 1 MPI rank per quadrant on a KNL node (i.e. 4 ranks per node)\r\n* 1 MPI rank per GPU on a multi-GPU node\r\n\r\nThe dry run mode should be extended to work with MPI so that projections can be made from simulations with multiple MPI ranks on a node, or simulations running on a small number of nodes."}}
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