{"action":"created","issue":{"url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/482","labels_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/482/labels{/name}","comments_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/482/comments","events_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/482/events","html_url":"https://github.com/ContinuumIO/anaconda-issues/issues/482","id":112147941,"number":482,"title":"Defaulting to numpy 1.10.* causes performance regression","user":{"login":"esheldon","id":621661,"avatar_url":"https://avatars.githubusercontent.com/u/621661?v=3","gravatar_id":"","url":"https://api.github.com/users/esheldon","html_url":"https://github.com/esheldon","followers_url":"https://api.github.com/users/esheldon/followers","following_url":"https://api.github.com/users/esheldon/following{/other_user}","gists_url":"https://api.github.com/users/esheldon/gists{/gist_id}","starred_url":"https://api.github.com/users/esheldon/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/esheldon/subscriptions","organizations_url":"https://api.github.com/users/esheldon/orgs","repos_url":"https://api.github.com/users/esheldon/repos","events_url":"https://api.github.com/users/esheldon/events{/privacy}","received_events_url":"https://api.github.com/users/esheldon/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-10-19T13:47:15Z","updated_at":"2015-10-19T16:09:43Z","closed_at":"2015-10-19T16:05:16Z","body":"numpy 1.10.0 and 1.10.1 have a serious performance regression\r\n\r\nhttps://github.com/numpy/numpy/issues/6467\r\n\r\nThe new numpy can be ten to thousands of times slower for real world use cases with structured arrays.  The numpy devs have not yet committed to any timescale for rolling out the fix.\r\n\r\n1.10.* is now the default in anaconda.  I think it would be prudent to somehow roll back so that 1.9 is again the default.  I understand this may be logistically difficult, so I want to open a discussion.\r\n\r\nAt the very least, I think it would be useful to send notification that common numpy operations could be much slower after a conda update, and give explicit instructions on now to pin numpy."},"comment":{"url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/comments/149261138","html_url":"https://github.com/ContinuumIO/anaconda-issues/issues/482#issuecomment-149261138","issue_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/482","id":149261138,"user":{"login":"ilanschnell","id":334496,"avatar_url":"https://avatars.githubusercontent.com/u/334496?v=3","gravatar_id":"","url":"https://api.github.com/users/ilanschnell","html_url":"https://github.com/ilanschnell","followers_url":"https://api.github.com/users/ilanschnell/followers","following_url":"https://api.github.com/users/ilanschnell/following{/other_user}","gists_url":"https://api.github.com/users/ilanschnell/gists{/gist_id}","starred_url":"https://api.github.com/users/ilanschnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ilanschnell/subscriptions","organizations_url":"https://api.github.com/users/ilanschnell/orgs","repos_url":"https://api.github.com/users/ilanschnell/repos","events_url":"https://api.github.com/users/ilanschnell/events{/privacy}","received_events_url":"https://api.github.com/users/ilanschnell/received_events","type":"User","site_admin":false},"created_at":"2015-10-19T16:09:43Z","updated_at":"2015-10-19T16:09:43Z","body":"Ok, we can add a note about that in the release notes."}}