{"action":"created","issue":{"url":"https://api.github.com/repos/NumScale/boost.simd/issues/175","repository_url":"https://api.github.com/repos/NumScale/boost.simd","labels_url":"https://api.github.com/repos/NumScale/boost.simd/issues/175/labels{/name}","comments_url":"https://api.github.com/repos/NumScale/boost.simd/issues/175/comments","events_url":"https://api.github.com/repos/NumScale/boost.simd/issues/175/events","html_url":"https://github.com/NumScale/boost.simd/issues/175","id":160838611,"number":175,"title":"boost::simd::log performance","user":{"login":"superbobry","id":185856,"avatar_url":"https://avatars.githubusercontent.com/u/185856?v=3","gravatar_id":"","url":"https://api.github.com/users/superbobry","html_url":"https://github.com/superbobry","followers_url":"https://api.github.com/users/superbobry/followers","following_url":"https://api.github.com/users/superbobry/following{/other_user}","gists_url":"https://api.github.com/users/superbobry/gists{/gist_id}","starred_url":"https://api.github.com/users/superbobry/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/superbobry/subscriptions","organizations_url":"https://api.github.com/users/superbobry/orgs","repos_url":"https://api.github.com/users/superbobry/repos","events_url":"https://api.github.com/users/superbobry/events{/privacy}","received_events_url":"https://api.github.com/users/superbobry/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":30,"created_at":"2016-06-17T08:37:38Z","updated_at":"2016-11-01T16:30:09Z","closed_at":null,"body":"I did a benchmark comparing the performance of log from boost.simd (via JNI) to that of [Yeppp!](http://www.yeppp.info). Results for AVX are summarized in a table below (higher is better).\n\n```\nBenchmark               (arraySize)   Mode  Cnt    Score   Error   Units\nLogBenchmark.boostSimd         1000  thrpt   10   80.880 ± 0.356  ops/ms\nLogBenchmark.boostSimd        10000  thrpt   10    7.495 ± 0.028  ops/ms\nLogBenchmark.boostSimd       100000  thrpt   10    0.723 ± 0.002  ops/ms\nLogBenchmark.yeppp             1000  thrpt   10  421.762 ± 1.878  ops/ms\nLogBenchmark.yeppp            10000  thrpt   10   46.299 ± 0.166  ops/ms\nLogBenchmark.yeppp           100000  thrpt   10    4.731 ± 0.043  ops/ms\n```\n\nThe conclusion is that Yeppp! can be up to 6 times faster. I wonder if this is due to the differences in the algorithm used or rather a result of an implementation quirk.\n\nYeppp! provides a [C/C++ API](http://docs.yeppp.info/c) so it should be possible to replicate the results without resorting to Java.\n"},"comment":{"url":"https://api.github.com/repos/NumScale/boost.simd/issues/comments/257615154","html_url":"https://github.com/NumScale/boost.simd/issues/175#issuecomment-257615154","issue_url":"https://api.github.com/repos/NumScale/boost.simd/issues/175","id":257615154,"user":{"login":"jfalcou","id":285977,"avatar_url":"https://avatars.githubusercontent.com/u/285977?v=3","gravatar_id":"","url":"https://api.github.com/users/jfalcou","html_url":"https://github.com/jfalcou","followers_url":"https://api.github.com/users/jfalcou/followers","following_url":"https://api.github.com/users/jfalcou/following{/other_user}","gists_url":"https://api.github.com/users/jfalcou/gists{/gist_id}","starred_url":"https://api.github.com/users/jfalcou/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jfalcou/subscriptions","organizations_url":"https://api.github.com/users/jfalcou/orgs","repos_url":"https://api.github.com/users/jfalcou/repos","events_url":"https://api.github.com/users/jfalcou/events{/privacy}","received_events_url":"https://api.github.com/users/jfalcou/received_events","type":"User","site_admin":false},"created_at":"2016-11-01T16:30:09Z","updated_at":"2016-11-01T16:30:09Z","body":"@superbobry again, new version for LOG has been merged.\r\n\r\nIt also happens to be that YEPP computes at 2 ULPs of precision while we do at 0.5 ULP. This may explain that."}}
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