[GHC] #13535: vector test suite uses excessive memory on GHC 8.2

GHC ghc-devs at haskell.org
Tue Apr 18 02:47:24 UTC 2017


#13535: vector test suite uses excessive memory on GHC 8.2
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10800            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 As I suspected, there appears to be a large number of duplicate top-level
 bindings in the code that gets passed Core Tidy in 8.2.  In particular, I
 count at least 25 copies of the same binding,
 {{{#!hs
 $s$wfoldlM_loop :: State# RealWorld-> [] Bool-> Int#-> MutableArray#
 RealWorld Bool-> Int#-> Int#-> (#,#) (TupleRep ([] RuntimeRep)) LiftedRep
 (State# RealWorld) (Vector Bool)
 {- Core Size{terms=209 types=244 cos=466 vbinds=7 jbinds=0} -}
 $s$wfoldlM_loop = ...
 }}}
 I'll need to work out why tomorrow.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13535#comment:10>
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