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

[GHC]

#13535: vector test suite uses excessive memory on GHC 8.2
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       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 tuxArg):

 Hi, It seems this bug is affecting me. I'm benchmarking my code (not test
 suites) with stack. The code does many zipWith, map and foldl over
 storable vectors with double values. Here are some rts stats comparison
 between 8.0.2 (last stack ok, lts-9.21) and 8.2.2 (lts-10.0):


 {{{
 ghc 8.0.2:
   66,593,737,608 bytes allocated in the heap
      930,040,096 bytes copied during GC
               15 MB total memory in use (0 MB lost due to fragmentation)

                                      Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     10101 colls,     0 par    1.424s   1.548s     0.0002s
 0.0014s
   Gen  1       879 colls,     0 par    0.408s   0.377s     0.0004s
 0.0018s

   Total   time   74.408s  ( 75.442s elapsed)
   %GC     time       2.5%  (2.6% elapsed)
   Alloc rate    917,572,442 bytes per MUT second
   Productivity  97.5% of total user, 97.4% of total elapsed

 ghc 8.2.2:
  317,181,489,136 bytes allocated in the heap
    1,806,653,248 bytes copied during GC
               15 MB total memory in use (0 MB lost due to fragmentation)

                                      Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     68766 colls,     0 par    3.700s   3.448s     0.0001s
 0.0024s
   Gen  1      1542 colls,     0 par    0.164s   0.157s     0.0001s
 0.0009s

   Total   time  118.112s  (119.443s elapsed)
   %GC     time       3.3%  (3.0% elapsed)
   Alloc rate    2,776,254,193 bytes per MUT second
   Productivity  96.7% of total user, 97.0% of total elapsed
 }}}

 Is there any known workaround?. This issue is not allowing me to upgrade
 from ghc 8.0.2. Thanks.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13535#comment:52>
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