[GHC] #13304: GHC 8.0.* is slow when run on Windows 10 Ubuntu subsystem

[GHC]

#13304: GHC 8.0.* is slow when run on Windows 10 Ubuntu subsystem
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        Reporter:  sukhmel           |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9706             |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => invalid
 * related:   => #9706


Comment:

 This is indeed a BashOnWindows bug. The original issue reported in
 comment:1 has been closed in favor of this one
 (https://github.com/Microsoft/BashOnWindows/issues/1671). In that thread,
 a BashOnWindows dev
 [https://github.com/Microsoft/BashOnWindows/issues/1671#issuecomment-277764856
 notes]:

 > This is on our backlog but is unlikely to make the Creators Update. I
 know we're planning on looking at this soon though.
 >
 > For some context, I've looked at what causes this slowdown. For some
 reason stack has mapped an mind-bogglingly huge region of memory (I'm
 talking dozens of terabytes). When we fork we walk the entire address
 range to set up the new process's state. We have a design that should
 vastly speed this up, but we're approaching "pencils down" date for
 Creators Update.

 The "some reason" is #9706, which explains why this can't be reproduced in
 GHC 7.10.

 There's not much that GHC can do from its end (besides waiting for
 BashOnWindows to apply a fix), so I'm going to close this as invalid.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13304#comment:4>
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