Re: [GHC] #9476: Implement late lambda-lifting

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Re: [GHC] #9476: Implement late lambda-lifting

Nicolas Frisby
I'm happy this is seeing some attention! I've habitually over promised on this and feel bad about that. My work-life-hobby programming balance has remained a mystery to me.

Even so, I'll give what answers I can to any questions that come up. I remember ultimately getting stuck on trying to identify a broadly useful heuristic: there are lots of possible parameters to tune and I was seeing massive run time differences for nofib cases on different CPU architectures for equivalent LLF parameters. I never managed to get a good handle on the crucial independent variables (e.g. code cache sizes, RTS parameters, etc). I'm hoping the join point work revealed some easier wins. Best of luck and don't hesitate to ping me with questions. Hope I can help.

On Wed, Apr 25, 2018, 10:33 GHC <[hidden email]> wrote:
#9476: Implement late lambda-lifting
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                Owner:  nfrisby
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8763             |  Differential Rev(s):
       Wiki Page:  LateLamLift       |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 OK, great.  Do keep us posted.  I think there are real wins to be had
 here.   Nicholas's detailed wiki page identifies many of the issues very
 clearly.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9476#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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