{"action":"created","issue":{"url":"https://api.github.com/repos/cms-sw/cmssw/issues/17545","repository_url":"https://api.github.com/repos/cms-sw/cmssw","labels_url":"https://api.github.com/repos/cms-sw/cmssw/issues/17545/labels{/name}","comments_url":"https://api.github.com/repos/cms-sw/cmssw/issues/17545/comments","events_url":"https://api.github.com/repos/cms-sw/cmssw/issues/17545/events","html_url":"https://github.com/cms-sw/cmssw/pull/17545","id":208388624,"number":17545,"title":"Tuning of iterative Tracking at HLT using Cellular Automaton","user":{"login":"JanFSchulte","id":4459228,"avatar_url":"https://avatars.githubusercontent.com/u/4459228?v=3","gravatar_id":"","url":"https://api.github.com/users/JanFSchulte","html_url":"https://github.com/JanFSchulte","followers_url":"https://api.github.com/users/JanFSchulte/followers","following_url":"https://api.github.com/users/JanFSchulte/following{/other_user}","gists_url":"https://api.github.com/users/JanFSchulte/gists{/gist_id}","starred_url":"https://api.github.com/users/JanFSchulte/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JanFSchulte/subscriptions","organizations_url":"https://api.github.com/users/JanFSchulte/orgs","repos_url":"https://api.github.com/users/JanFSchulte/repos","events_url":"https://api.github.com/users/JanFSchulte/events{/privacy}","received_events_url":"https://api.github.com/users/JanFSchulte/received_events","type":"User","site_admin":false},"labels":[{"id":88653795,"url":"https://api.github.com/repos/cms-sw/cmssw/labels/comparison-pending","name":"comparison-pending","color":"fbca04","default":false},{"id":52822551,"url":"https://api.github.com/repos/cms-sw/cmssw/labels/hlt-pending","name":"hlt-pending","color":"fbca04","default":false},{"id":56953091,"url":"https://api.github.com/repos/cms-sw/cmssw/labels/orp-pending","name":"orp-pending","color":"fbca04","default":false},{"id":53167770,"url":"https://api.github.com/repos/cms-sw/cmssw/labels/pending-signatures","name":"pending-signatures","color":"eb6420","default":false},{"id":170521617,"url":"https://api.github.com/repos/cms-sw/cmssw/labels/tests-started","name":"tests-started","color":"eb6420","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/cms-sw/cmssw/milestones/64","html_url":"https://github.com/cms-sw/cmssw/milestone/64","labels_url":"https://api.github.com/repos/cms-sw/cmssw/milestones/64/labels","id":2138657,"number":64,"title":"Next CMSSW_9_0_X","description":null,"creator":{"login":"smuzaffar","id":4115138,"avatar_url":"https://avatars.githubusercontent.com/u/4115138?v=3","gravatar_id":"","url":"https://api.github.com/users/smuzaffar","html_url":"https://github.com/smuzaffar","followers_url":"https://api.github.com/users/smuzaffar/followers","following_url":"https://api.github.com/users/smuzaffar/following{/other_user}","gists_url":"https://api.github.com/users/smuzaffar/gists{/gist_id}","starred_url":"https://api.github.com/users/smuzaffar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/smuzaffar/subscriptions","organizations_url":"https://api.github.com/users/smuzaffar/orgs","repos_url":"https://api.github.com/users/smuzaffar/repos","events_url":"https://api.github.com/users/smuzaffar/events{/privacy}","received_events_url":"https://api.github.com/users/smuzaffar/received_events","type":"User","site_admin":false},"open_issues":55,"closed_issues":681,"state":"open","created_at":"2016-11-16T08:55:18Z","updated_at":"2017-02-19T17:21:25Z","due_on":null,"closed_at":null},"comments":20,"created_at":"2017-02-17T09:47:21Z","updated_at":"2017-02-19T22:53:25Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/cms-sw/cmssw/pulls/17545","html_url":"https://github.com/cms-sw/cmssw/pull/17545","diff_url":"https://github.com/cms-sw/cmssw/pull/17545.diff","patch_url":"https://github.com/cms-sw/cmssw/pull/17545.patch"},"body":"This PR is a cumulative update of the customization function for the iterative tracking to use CA seeing at HLT. \r\n\r\nMain features of this update: \r\n- Switches iterations 1 and 2 to use CA Quadruplets and Triplets, respectively\r\n- Switches from CkfTrajectoryBuilder to GroupedCkfTrajectoryBuilder for all iterations, as promised at the last TSG workshop in the beginning of November, but so far not actually put into the release\r\n- Tuning of the configuration in 9_0_0_pre4 to maximize performance\r\n\r\nDetailed performance comparisons can be found here: https://cernbox.cern.ch/index.php/s/iF6QrRMTcqxPyB8\r\nCompared are the performance of the new configuration to what is in pre4 right now, and also to the 2016 performance for reference. \r\n\r\nIn summary, efficiency is significantly increased for no cost in fake rate. Timing improves from 220ms for 2016 to about 180ms for the new configuration, a speedup of about 20%. Note that this timing measurements have been done in 8_1_0_pre16 because the FastTimerService works in that release. 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