#15891: Excessive system time during execution of GHC-built executables on macOS ---------------------------------+---------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.6.2 Resolution: | Keywords: Operating System: MacOS X | Architecture: Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | ---------------------------------+---------------------------------------- Comment (by gridaphobe): I'm noticing similar behavior on my macbook. System information: {{{ macOS Mojave, 10.14 Processor: 2.6 GHz Intel Core i7 Memory: 16 GB 2133 MHz LPDDR3 SSD main storage, formatted with APFS happy 1.19.9 alex 3.2.4 gcc is clang-1000.11.45.5, Apple LLVM version 10.0.0, thread model: posix bootstrap ghc is 8.4.4 BuildFlavour = devel2 }}} Just like Richard, the stage1 build is snappy, but things slow down when I start using ghc-stage1. I also noticed a sudden jump to 40% system time (compared to 10% user time and 50% idle) when I started using ghc-stage1. I'm not sure how to sample ghc, but I ran the [https://gist.github.com/gridaphobe/dd3df6616720c571548584160912b950 dtruss command]. I don't really know what to make of the dtruss output, but I'm happy to run any other suggested tests. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15891#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler