[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
-------------------------------------+-------------------------------------
           Reporter:  sukhmel        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 I have tried both 8.0.1 and 8.0.2 versions of GHC. 7.10.3 runs just fine.
 Installation process is also much faster for 7.10.3, later versions have
 taken around 4 hours to be installed.

 Programs compiled with slow GHC are also slow. Sample program:

 {{{#!haskell
 main = putStrLn "Hello, world!"
 }}}

 GHC is installed with Stack.

 Windows version is 1607 build 15031.0 I believe this could be a bug in
 implementation of Ubuntu subsystem, but I'm not quite sure what part of it
 is failing.

 {{{
 $ time stack ghc -- -e 'putStrLn ""'

 real    2m28.240s
 user    0m0.375s
 sys     3m30.078s

 $ time stack ghc -- --version
 The Glorious Glasgow Haskell Compilation System, version 8.0.2

 real    1m45.533s
 user    0m0.125s
 sys     2m46.516s

 time stack ghc --compiler ghc-8.0.1 -- --version
 The Glorious Glasgow Haskell Compilation System, version 8.0.1

 real    2m54.764s
 user    0m0.234s
 sys     3m58.422s
 }}}

 {{{
 $ time ghc -e 'putStrLn ""'

 real    0m0.872s
 user    0m0.109s
 sys     0m0.125s

 $ time ghc --version
 The Glorious Glasgow Haskell Compilation System, version 7.6.3

 real    0m0.072s
 user    0m0.000s
 sys     0m0.031s

 time stack ghc --compiler ghc-7.10.3 -- -e 'putStrLn ""'

 real    0m0.876s
 user    0m0.234s
 sys     0m0.688s

 time stack ghc --compiler ghc-7.10.3 -- --version
 The Glorious Glasgow Haskell Compilation System, version 7.10.3

 real    0m0.832s
 user    0m0.109s
 sys     0m0.813s
 }}}

 {{{
 $ echo 'main = putStrLn "Hello, world!"' > test.hs
 $ time stack ghc --compiler ghc-8.0.2 -- test
 [1 of 1] Compiling Main             ( test.hs, test.o )
 Linking test ...

 real    3m56.582s
 user    0m0.609s
 sys     5m8.125s

 $ time ./test
 Hello, world!

 real    0m27.540s
 user    0m0.000s
 sys     0m27.297s
 }}}

 {{{
 $ echo 'main = putStrLn "Hello, world!"' > test.hs
 $ time stack ghc --compiler ghc-7.10.3 -- test
 [1 of 1] Compiling Main             ( test.hs, test.o )
 Linking test ...

 real    0m2.222s
 user    0m0.406s
 sys     0m1.406s

 $ time ./test
 Hello, world!

 real    0m0.030s
 user    0m0.000s
 sys     0m0.031s
 }}}

 Part of Stack output with timings:

 {{{
 $ stack ghc --verbose -- -e 'putStrLn "Hello, world!"'
 Version 1.3.2, Git revision 3f675146590da4f3edf768b89355f798229da2a5 (4395
 commits) x86_64 hpack-0.15.0
 ...
 2017-02-19 21:13:05.756085: [debug] No project config file found, using
 defaults.
 2017-02-19 21:13:05.759402: [debug] Run from outside a project, using
 implicit global project config
 2017-02-19 21:13:05.761724: [debug] Using resolver: lts-8.0 from implicit
 global project's config file: /home/sukhmel/.stack/global-
 project/stack.yaml
 ...
 2017-02-19 21:13:05.788855: [debug] Run process: /sbin/ldconfig -p
 2017-02-19 21:13:05.816489: [debug] Process finished in 26ms:
 /sbin/ldconfig -p
 2017-02-19 21:13:05.820648: [debug] Run process: /usr/bin/gcc -v
 2017-02-19 21:13:05.844975: [debug] Process finished in 23ms: /usr/bin/gcc
 -v
 ...
 2017-02-19 21:13:05.854997: [debug] Using standard GHC build
 2017-02-19 21:13:05.856774: [debug] Getting global package database
 location
 ...
 2017-02-19 21:13:05.867711: [debug] Run process:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc-pkg --no-
 user-package-db list --global
 2017-02-19 21:13:05.888957: [debug] Run process:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc --numeric-
 version
 2017-02-19 21:13:05.919968: [debug] Run process:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc-pkg --no-
 user-package-db field --simple-output Cabal version
 2017-02-19 21:13:38.605653: [debug] Process finished in 32736ms:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc-pkg --no-
 user-package-db list --global
 2017-02-19 21:14:11.930034: [debug] Process finished in 32792ms:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc-pkg --no-
 user-package-db field --simple-output Cabal version
 2017-02-19 21:14:11.931071: [debug] Process finished in 32831ms:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc --numeric-
 version
 ...
 2017-02-19 21:14:11.939817: [debug] Run process:
 /home/sukhmel/.stack/programs/x86_64-linux/ghc-8.0.2/bin/ghc -e "putStrLn
 \"Hello, world!\""
 }}}

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