{"action":"created","issue":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/24383","repository_url":"https://api.github.com/repos/JuliaLang/julia","labels_url":"https://api.github.com/repos/JuliaLang/julia/issues/24383/labels{/name}","comments_url":"https://api.github.com/repos/JuliaLang/julia/issues/24383/comments","events_url":"https://api.github.com/repos/JuliaLang/julia/issues/24383/events","html_url":"https://github.com/JuliaLang/julia/issues/24383","id":269345782,"number":24383,"title":"20+ minute precompilation regression on v0.6.1","user":{"login":"ChrisRackauckas","id":1814174,"avatar_url":"https://avatars2.githubusercontent.com/u/1814174?v=4","gravatar_id":"","url":"https://api.github.com/users/ChrisRackauckas","html_url":"https://github.com/ChrisRackauckas","followers_url":"https://api.github.com/users/ChrisRackauckas/followers","following_url":"https://api.github.com/users/ChrisRackauckas/following{/other_user}","gists_url":"https://api.github.com/users/ChrisRackauckas/gists{/gist_id}","starred_url":"https://api.github.com/users/ChrisRackauckas/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ChrisRackauckas/subscriptions","organizations_url":"https://api.github.com/users/ChrisRackauckas/orgs","repos_url":"https://api.github.com/users/ChrisRackauckas/repos","events_url":"https://api.github.com/users/ChrisRackauckas/events{/privacy}","received_events_url":"https://api.github.com/users/ChrisRackauckas/received_events","type":"User","site_admin":false},"labels":[{"id":47509082,"url":"https://api.github.com/repos/JuliaLang/julia/labels/regression","name":"regression","color":"ff2510","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2017-10-28T20:02:56Z","updated_at":"2017-10-29T02:21:26Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"From here: https://github.com/JuliaDiffEq/DifferentialEquations.jl/issues/209\r\n\r\nWe see a >20 minute compile time regression, along with post-compilation `using` statements taking as long as precompilation used to take. @mauro3 noted that it may not occur on Linux though, but latest Travis tests seem to show that this regression is widespread. "},"comment":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/comments/340232750","html_url":"https://github.com/JuliaLang/julia/issues/24383#issuecomment-340232750","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/24383","id":340232750,"user":{"login":"JeffBezanson","id":744556,"avatar_url":"https://avatars0.githubusercontent.com/u/744556?v=4","gravatar_id":"","url":"https://api.github.com/users/JeffBezanson","html_url":"https://github.com/JeffBezanson","followers_url":"https://api.github.com/users/JeffBezanson/followers","following_url":"https://api.github.com/users/JeffBezanson/following{/other_user}","gists_url":"https://api.github.com/users/JeffBezanson/gists{/gist_id}","starred_url":"https://api.github.com/users/JeffBezanson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JeffBezanson/subscriptions","organizations_url":"https://api.github.com/users/JeffBezanson/orgs","repos_url":"https://api.github.com/users/JeffBezanson/repos","events_url":"https://api.github.com/users/JeffBezanson/events{/privacy}","received_events_url":"https://api.github.com/users/JeffBezanson/received_events","type":"User","site_admin":false},"created_at":"2017-10-29T02:21:25Z","updated_at":"2017-10-29T02:21:25Z","author_association":"OWNER","body":"I tried bisecting this. It's a little tricky since it seems to have regressed in two steps, where BandedMatrices.ji went from 20MB to 80MB to 120MB. Unfortunately the culprit from bisecting is #23012. That was definitely a bugfix, which means the bug was an accidental optimization. Frankly, even 20MB is way too big for this package, so I suspect we're doing too much inference, and the bug caused us to skip saving a bunch of stuff that actually didn't matter. We end up spending lots of time in `jl_recache_types` (loading lots of types takes longer than saving them)."}}
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