{"action":"created","issue":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/27512","repository_url":"https://api.github.com/repos/JuliaLang/julia","labels_url":"https://api.github.com/repos/JuliaLang/julia/issues/27512/labels{/name}","comments_url":"https://api.github.com/repos/JuliaLang/julia/issues/27512/comments","events_url":"https://api.github.com/repos/JuliaLang/julia/issues/27512/events","html_url":"https://github.com/JuliaLang/julia/issues/27512","id":330886345,"node_id":"MDU6SXNzdWUzMzA4ODYzNDU=","number":27512,"title":"100x compile time slowdown in BandedMatrices.jl","user":{"login":"dlfivefifty","id":1229737,"node_id":"MDQ6VXNlcjEyMjk3Mzc=","avatar_url":"https://avatars3.githubusercontent.com/u/1229737?v=4","gravatar_id":"","url":"https://api.github.com/users/dlfivefifty","html_url":"https://github.com/dlfivefifty","followers_url":"https://api.github.com/users/dlfivefifty/followers","following_url":"https://api.github.com/users/dlfivefifty/following{/other_user}","gists_url":"https://api.github.com/users/dlfivefifty/gists{/gist_id}","starred_url":"https://api.github.com/users/dlfivefifty/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dlfivefifty/subscriptions","organizations_url":"https://api.github.com/users/dlfivefifty/orgs","repos_url":"https://api.github.com/users/dlfivefifty/repos","events_url":"https://api.github.com/users/dlfivefifty/events{/privacy}","received_events_url":"https://api.github.com/users/dlfivefifty/received_events","type":"User","site_admin":false},"labels":[{"id":944193805,"node_id":"MDU6TGFiZWw5NDQxOTM4MDU=","url":"https://api.github.com/repos/JuliaLang/julia/labels/latency","name":"latency","color":"76e8d8","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":7,"created_at":"2018-06-09T13:17:21Z","updated_at":"2018-06-10T12:07:52Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"BandedMatrices.jl has had an almost 100x slowdown (see \"bug-slowmul\" branch) in 0.7-alpha:\r\n```julia\r\njulia> A = brand(5,5,1,1); b = randn(5); @time A*b # v0.6.2\r\n  0.375991 seconds (335.46 k allocations: 16.421 MiB)\r\n```\r\nVS\r\n```julia\r\njulia> A = brand(5,5,1,1); b = randn(5); @time A*b  # v0.7, branch \"bug-slowmul\"\r\n 24.676427 seconds (57.04 M allocations: 5.038 GiB, 3.76% gc time)\r\n```\r\n\r\nI sped this up to \"only\" 15x slowdown on \"master\" by making the code type stable:\r\n```julia\r\njulia> A = brand(5,5,1,1); b = randn(5); @time A*b # v0.7, branch \"master\"\r\n  5.644144 seconds (16.42 M allocations: 1.252 GiB, 4.54% gc time)\r\n```"},"comment":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/comments/396044004","html_url":"https://github.com/JuliaLang/julia/issues/27512#issuecomment-396044004","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/27512","id":396044004,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NjA0NDAwNA==","user":{"login":"dlfivefifty","id":1229737,"node_id":"MDQ6VXNlcjEyMjk3Mzc=","avatar_url":"https://avatars3.githubusercontent.com/u/1229737?v=4","gravatar_id":"","url":"https://api.github.com/users/dlfivefifty","html_url":"https://github.com/dlfivefifty","followers_url":"https://api.github.com/users/dlfivefifty/followers","following_url":"https://api.github.com/users/dlfivefifty/following{/other_user}","gists_url":"https://api.github.com/users/dlfivefifty/gists{/gist_id}","starred_url":"https://api.github.com/users/dlfivefifty/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dlfivefifty/subscriptions","organizations_url":"https://api.github.com/users/dlfivefifty/orgs","repos_url":"https://api.github.com/users/dlfivefifty/repos","events_url":"https://api.github.com/users/dlfivefifty/events{/privacy}","received_events_url":"https://api.github.com/users/dlfivefifty/received_events","type":"User","site_admin":false},"created_at":"2018-06-10T12:07:52Z","updated_at":"2018-06-10T12:07:52Z","author_association":"CONTRIBUTOR","body":"There's no deprecation warnings, so `julia --depwarn=no` doesn't improve anything. (And it would be strange if it did.)"}}
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