Interesting! I keep nofib/Simon-nofib-notes for per-benchmark notes on perf. Would you like to add a note for 'binary-trees' pointing to these emails? So if someone later is looking for perf changes in binary-trees, they have some back-pointers to chase up. Thanks Simon | -----Original Message----- | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of | Joachim Breitner | Sent: 09 March 2017 15:10 | To: ghc-devs@haskell.org | Subject: Re: Better perf | | Hi, | | Am Dienstag, den 07.03.2017, 22:55 +0000 schrieb Simon Peyton Jones | via | ghc-devs: | > > But: binary-trees runtime increases by 5%. | > | > David: might you look to see if there is any obvious reason for this | > regression? We could just accept it, but it's always good to know | > why, and to document it. | | Turns out that my commit | Add rule mapFB c (λx.x) = c | fixed that regression: | https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fperf. | haskell.org%2Fghc%2F%23revision%2F2fa44217c1d9722227297eefb0d6c6aed7e1 | 28ca&data=02%7C01%7Csimonpj%40microsoft.com%7C874797bc62de4b6aecf208d4 | 66fe7720%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6362466904875493 | 08&sdata=ysGORaGgIlhCc88uQHB3v0sh5LNWhFY06iSgnTm6Pgo%3D&reserved=0 | | Maybe there is just a performance cliff there, and these jumps don’t | really mean anything. | | Greetings, | Joachim | | -- | Joachim “nomeata” Breitner | mail@joachim-breitner.de • | https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.j | oachim- | breitner.de%2F&data=02%7C01%7Csimonpj%40microsoft.com%7C874797bc62de4b | 6aecf208d466fe7720%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636246 | 690487549308&sdata=HxOTFdoh4hIqXVbPCgZOwMjob%2B572b1ymbAdBEXTF6A%3D&re | served=0 | XMPP: nomeata@joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F | Debian Developer: nomeata@debian.org