performance regressions

[Richard Eisenberg]

Fixed, hopefully!

On Dec 13, 2014, at 10:03 AM, Richard Eisenberg <eir at cis.upenn.edu> wrote:

> I think I've fixed this. I've pushed the fix to wip/rae, and waiting for validation results before pushing to master.
> 
> My hunch below was right -- it was the change to matchFam, which essentially evaluated type-level functions more strictly. I've now made it lazier again. I'd like to better understand the tradeoff here, and to see if there's a principled sweet spot. But that will happen in a few days.
> 
> Expect a push to master soon.
> 
> Again, sorry for the bother.
> 
> Richard
> 
> On Dec 13, 2014, at 8:32 AM, Joachim Breitner <mail at joachim-breitner.de> wrote:
> 
>> Hi,
>> 
>> 
>> Am Freitag, den 12.12.2014, 21:51 -0500 schrieb Richard Eisenberg:
>>> 
>>> Phab has shown up some performance regressions in my recent commits.
>>> See https://phabricator.haskell.org/harbormaster/build/2607/. The
>>> failures except for haddock.base are new, and evidently my fault. They
>>> didn't show up on Travis. Will look into it shortly, but I doubt over
>>> the weekend.
>> 
>> 
>> ghcspeed also observes this:
>> http://ghcspeed-nomeata.rhcloud.com/changes/?rev=7256213843b80d75a86f033be77516a62d56044a&exe=2&env=johan%27s%20buildbot
>> 
>> Especially the T9872 benchmarks have a huge increase in allocations. But
>> you seem to be aware of this, so that’s fine.
>> 
>> Greetings,
>> Joachim
>> 
>> -- 
>> Joachim “nomeata” Breitner
>> mail at joachim-breitner.de • http://www.joachim-breitner.de/
>> Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
>> Debian Developer: nomeata at debian.org
>> 
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