[GHC] #15663: T9675 inexplicably regressed in allocations due to text submodule bump

[GHC]

#15663: T9675 inexplicably regressed in allocations due to text submodule bump
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  alpmestan
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by alpmestan):

 On my machine, the test passes both at commit
 e40b3888d7b70bb5c95c377cac66b2839332673d (the one before the text
 submodule bump) and at commit 989dca6cbd93205a72f12a0921ba1216559a9e1e
 (the text submodule bump).

 Moreover, the important stats look really, really similar:

 ||  ||= before text bump =||= after text bump =||
 || bytes allocated || 67745356 || 678640112 ||
 || max bytes used || 20177520 || 18842304 ||
 || average bytes used || 8714779 || 8859872 ||
 || max mem in use || 77594624 || 73400320 ||

 and it just goes on, most of those stats align. Is that submodule bump the
 exact moment when the problem appeared? I'm going to try with an older
 commit and see if the stats look similar there too.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15663#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler