RE: perf.haskell.org’s list of branches got more useful

[Simon Peyton Jones]

Joachim

Fabulous.

But your email will soon disappear into the mists of time, and the page itself does not convey the same information.  

Is there a wiki page, kept up to date, that explains exactly how to read the performance results?

Simon

|  -----Original Message-----
|  From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of
|  Joachim Breitner
|  Sent: 23 April 2016 20:41
|  To: ghc-devs at haskell.org
|  Subject: perf.haskell.org’s list of branches got more useful
|  
|  Hi,
|  
|  the list of branches
|  on https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fper
|  f.haskell.org%2fghc&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7ce
|  c0ca8588956494efa3308d36baf36f5%7c72f988bf86f141af91ab2d7cd011db47%7c1&
|  sdata=Rk2Y38BjXeE9Et8yxiuOdpiJ3PSMn9RdIxonRksxTc4%3d got more useful.
|  It now shows the difference from the branch head to the merge base¹,
|  which should roughly exhibit the performance change that would be
|  caused by merging the branch into master.
|  
|  If the branch head or the merge base have not been measured (e.g.
|  because the build failed), the display might be a bit confusing. Same
|  with branches that often merge or cherry-pick from master. But in the
|  common case of a linear, possibly rebased, feature branch, it should
|  work fine.
|  
|  Greetings,
|  Joachim
|  
|  ¹ Which, I think, is the youngest commit also reachable from master. Or
|  something like that. Consult "man git merge-base" if you want a little
|  mind teaser.
|  
|  --
|  Joachim “nomeata” Breitner
|    mail at joachim-breitner.de •
|  https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fwww.jo
|  achim-
|  breitner.de%2f&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7cec0ca8
|  588956494efa3308d36baf36f5%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata
|  =ya%2bnaZWlbasw8BSIICImvWjh1x%2fb6%2bTsHJuKRGzu2Rg%3d
|    XMPP: nomeata at joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F
|    Debian Developer: nomeata at debian.org