#14974: 2-fold memory usage regression GHC 8.2.2 -> GHC 8.4.1 compiling `mmark`
package
-------------------------------------+-------------------------------------
Reporter: hvr | Owner: (none)
Type: bug | Status: new
Priority: high | Milestone:
Component: Compiler | Version: 8.4.1
Keywords: | Operating System: Unknown/Multiple
Architecture: | Type of failure: Compile-time
Unknown/Multiple | performance bug
Test Case: | Blocked By:
Blocking: | Related Tickets:
Differential Rev(s): | Wiki Page:
-------------------------------------+-------------------------------------
I haven't had time yet to diagnose where the memory is going to, but
here's how to reproduce:
{{{
cabal get mmark-0.0.5.6 && cd mmark-0.0.5.6/
cat > cabal.project <>
Preprocessing library for mmark-0.0.5.6..
Building library for mmark-0.0.5.6..
[1 of 9] Compiling Text.MMark.Parser.Internal.Type (
Text/MMark/Parser/Internal/Type.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser/Internal/Type.o
)
[2 of 9] Compiling Text.MMark.Parser.Internal (
Text/MMark/Parser/Internal.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser/Internal.o
)
[3 of 9] Compiling Text.MMark.Type ( Text/MMark/Type.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Type.o
)
Text/MMark/Type.hs:38:1: warning: [-Wunused-imports]
The import of ‘Data.Semigroup’ is redundant
except perhaps to import instances from ‘Data.Semigroup’
To import instances alone, use: import Data.Semigroup()
|
38 | import Data.Semigroup
| ^^^^^^^^^^^^^^^^^^^^^
[4 of 9] Compiling Text.MMark.Trans ( Text/MMark/Trans.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Trans.o
)
[5 of 9] Compiling Text.MMark.Util ( Text/MMark/Util.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Util.o
)
[6 of 9] Compiling Text.MMark.Render ( Text/MMark/Render.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Render.o
)
Text/MMark/Render.hs:25:1: warning: [-Wunused-imports]
The import of ‘Data.Semigroup’ is redundant
except perhaps to import instances from ‘Data.Semigroup’
To import instances alone, use: import Data.Semigroup()
|
25 | import Data.Semigroup
| ^^^^^^^^^^^^^^^^^^^^^
[7 of 9] Compiling Text.MMark.Parser ( Text/MMark/Parser.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser.o
)
[8 of 9] Compiling Text.MMark ( Text/MMark.hs, /tmp/mmark-0.0.5.6
/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark.o )
[9 of 9] Compiling Text.MMark.Extension ( Text/MMark/Extension.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Extension.o
)
<>
<>
}}}
and
{{{
Resolving dependencies...
Build profile: -w ghc-8.4.1 -O1
In order, the following will be built (use -v for more details):
- mmark-0.0.5.6 (lib) (first run)
Configuring library for mmark-0.0.5.6..
<>
Preprocessing library for mmark-0.0.5.6..
Building library for mmark-0.0.5.6..
[1 of 9] Compiling Text.MMark.Parser.Internal.Type (
Text/MMark/Parser/Internal/Type.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser/Internal/Type.o
)
[2 of 9] Compiling Text.MMark.Parser.Internal (
Text/MMark/Parser/Internal.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser/Internal.o
)
[3 of 9] Compiling Text.MMark.Type ( Text/MMark/Type.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Type.o
)
[4 of 9] Compiling Text.MMark.Trans ( Text/MMark/Trans.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Trans.o
)
[5 of 9] Compiling Text.MMark.Util ( Text/MMark/Util.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Util.o
)
[6 of 9] Compiling Text.MMark.Render ( Text/MMark/Render.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Render.o
)
[7 of 9] Compiling Text.MMark.Parser ( Text/MMark/Parser.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Parser.o
)
[8 of 9] Compiling Text.MMark ( Text/MMark.hs, /tmp/mmark-0.0.5.6
/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark.o )
[9 of 9] Compiling Text.MMark.Extension ( Text/MMark/Extension.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.4.1/mmark-0.0.5.6/build/Text/MMark/Extension.o
)
<>
<>
hvr@duo:/tmp/mmark-0.0.5.6$ cabal new-build -w ghc-8.2.2
Resolving dependencies...
Build profile: -w ghc-8.2.2 -O1
In order, the following will be built (use -v for more details):
- mmark-0.0.5.6 (lib) (first run)
Configuring library for mmark-0.0.5.6..
<>
Preprocessing library for mmark-0.0.5.6..
Building library for mmark-0.0.5.6..
[1 of 9] Compiling Text.MMark.Parser.Internal.Type (
Text/MMark/Parser/Internal/Type.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Parser/Internal/Type.o
)
[2 of 9] Compiling Text.MMark.Parser.Internal (
Text/MMark/Parser/Internal.hs, /tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Parser/Internal.o
)
[3 of 9] Compiling Text.MMark.Type ( Text/MMark/Type.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Type.o
)
[4 of 9] Compiling Text.MMark.Trans ( Text/MMark/Trans.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Trans.o
)
[5 of 9] Compiling Text.MMark.Util ( Text/MMark/Util.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Util.o
)
[6 of 9] Compiling Text.MMark.Render ( Text/MMark/Render.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Render.o
)
[7 of 9] Compiling Text.MMark.Parser ( Text/MMark/Parser.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Parser.o
)
[8 of 9] Compiling Text.MMark ( Text/MMark.hs, /tmp/mmark-0.0.5.6
/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark.o )
[9 of 9] Compiling Text.MMark.Extension ( Text/MMark/Extension.hs,
/tmp/mmark-0.0.5.6/dist-
newstyle/build/x86_64-linux/ghc-8.2.2/mmark-0.0.5.6/build/Text/MMark/Extension.o
)
<>
<>
}}}
Consequently,
- GHC 8.2.2: **2179M in use**, 0.001 INIT (0.000 elapsed), 58.237 MUT
(61.472 elapsed), 25.823 GC (25.795 elapsed)
- GHC 8.4.1: **4130M in use**, 0.000 INIT (0.000 elapsed), 58.546 MUT
(62.124 elapsed), 31.536 GC (31.505 elapsed)
--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14974
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler
