#13586: ghc --make seems to leak memory -------------------------------------+------------------------------------- Reporter: MikolajKonarski | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #13379 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by MikolajKonarski: @@ -27,0 +27,5 @@ + + Edit2: which actually doesn't prove the `--make` leak is a regression. + There may just be some other regression that makes the difference between + interrupted and non-interrupted compilation under 7.10.3 much smaller and + harder to measure. New description: (This is probably not reproducible with a small example.) When I build this project with `cabal build` https://github.com/LambdaHack/LambdaHack/commit/138123ab13edd4db6c8143720af6... the peek memory, as observed with `top`, is 10G*. When I instead interrupt the compilation with `^C` at the following point (compilation of this file take a couple of minutes, so it's easy to interrupt): {{{ [123 of 123] Compiling Game.LambdaHack.SampleImplementation.SampleMonadServer ( Game/LambdaHack/SampleImplementation/SampleMonadServer.hs, dist/build/Game/LambdaHack/SampleImplementation/SampleMonadServer.o ) }}} and then restart and continue to the end, peek memory usage in either of the two compilation parts is 5G*. So it seems `ghc --make` keeps some data that is either eventually not used or could as well be read on demand instead of kept in memory. Confirmed with 8.2.1-rc1 as well, but it's not trivial to compile due to restrictive upper bounds of many packages. *exact numerical values are made up Edit: this is a regression, GHC 7.10.3 uses < 3G for compilation without even interrupting Edit2: which actually doesn't prove the `--make` leak is a regression. There may just be some other regression that makes the difference between interrupted and non-interrupted compilation under 7.10.3 much smaller and harder to measure. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13586#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler