[GHC] #9960: Performance problem with TrieMap

[GHC]

#9960: Performance problem with TrieMap
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D606
-------------------------------------+-------------------------------------

Comment (by ezyang):

 Nice improvement on T9872d

 {{{
 =====> T9872d(normal) 1507 of 4389 [0, 0, 0]
 cd ./perf/compiler && '/home/hs01/ezyang/ghc-tries-validate/inplace/bin
 /ghc-stage2' -fforce-recomp -dno-debug-output -no-user-package-db -rtsopts
 -fno-warn-tabs -fno-ghci-history -c T9872d.hs   +RTS -V0
 -tT9872d.comp.stats --machine-readable -RTS  >T9872d.comp.stderr 2>&1
 bytes allocated value is too low:
 (If this is because you have improved GHC, please
 update the test so that GHC doesn't regress again)
     Expected    T9872d(normal) bytes allocated: 739189056 +/-5%
     Lower bound T9872d(normal) bytes allocated: 702229603
     Upper bound T9872d(normal) bytes allocated: 776148509
     Actual      T9872d(normal) bytes allocated: 687562440
     Deviation   T9872d(normal) bytes allocated:      -7.0 %
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9960#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler