{"action":"created","issue":{"url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/137","repository_url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl","labels_url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/137/labels{/name}","comments_url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/137/comments","events_url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/137/events","html_url":"https://github.com/JuliaDiff/ForwardDiff.jl/issues/137","id":170279731,"number":137,"title":"ForwardDiff v0.2.2 compiles really slowly","user":{"login":"rgiordan","id":4494910,"avatar_url":"https://avatars.githubusercontent.com/u/4494910?v=3","gravatar_id":"","url":"https://api.github.com/users/rgiordan","html_url":"https://github.com/rgiordan","followers_url":"https://api.github.com/users/rgiordan/followers","following_url":"https://api.github.com/users/rgiordan/following{/other_user}","gists_url":"https://api.github.com/users/rgiordan/gists{/gist_id}","starred_url":"https://api.github.com/users/rgiordan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rgiordan/subscriptions","organizations_url":"https://api.github.com/users/rgiordan/orgs","repos_url":"https://api.github.com/users/rgiordan/repos","events_url":"https://api.github.com/users/rgiordan/events{/privacy}","received_events_url":"https://api.github.com/users/rgiordan/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":11,"created_at":"2016-08-09T21:49:38Z","updated_at":"2016-08-11T21:59:21Z","closed_at":null,"body":"Our [Celeste package](https://github.com/jeff-regier/Celeste.jl) depends extensively on ```ForwardDiff.jl``` for our [unit tests](https://github.com/jeff-regier/Celeste.jl/blob/master/test/test_derivatives.jl).  When we upgrade to v0.2.2 of ```ForwardDiff.jl``` we see massive slowdowns in compile time, on the order of 10x longer per function differentiated.  The result is that ```ForwardDiff.jl``` is too slow to be usable for testing, which for us is a big loss.  Furthermore, we cannot upgrade ```Optim.jl``` without also upgrading ```ForwardDiff.jl``` and slamming our test performance.\r\n\r\nNote that we're dependent on julia 0.5.   I see that ForwardDiff's own unit tests take about 3x longer in 0.5 than 0.4.\r\n\r\nAny thoughts?  Is there any chance that this compile time will come back down soon?"},"comment":{"url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/comments/239306389","html_url":"https://github.com/JuliaDiff/ForwardDiff.jl/issues/137#issuecomment-239306389","issue_url":"https://api.github.com/repos/JuliaDiff/ForwardDiff.jl/issues/137","id":239306389,"user":{"login":"KristofferC","id":1282691,"avatar_url":"https://avatars.githubusercontent.com/u/1282691?v=3","gravatar_id":"","url":"https://api.github.com/users/KristofferC","html_url":"https://github.com/KristofferC","followers_url":"https://api.github.com/users/KristofferC/followers","following_url":"https://api.github.com/users/KristofferC/following{/other_user}","gists_url":"https://api.github.com/users/KristofferC/gists{/gist_id}","starred_url":"https://api.github.com/users/KristofferC/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/KristofferC/subscriptions","organizations_url":"https://api.github.com/users/KristofferC/orgs","repos_url":"https://api.github.com/users/KristofferC/repos","events_url":"https://api.github.com/users/KristofferC/events{/privacy}","received_events_url":"https://api.github.com/users/KristofferC/received_events","type":"User","site_admin":false},"created_at":"2016-08-11T21:59:21Z","updated_at":"2016-08-11T21:59:21Z","body":"Def worth looking into."}}
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