#14981: GHC parallel GC is not doing well on modern many-core machine -------------------------------------+------------------------------------- Reporter: varosi | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 8.4.1 System | 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'm testing a small ray-tracer on different many-core machines, like x64 88 core and Aarch64 96 core (on https://packet.net). Parallel GC seems to have throughput problems on more than 24-32 cores. See this Reddit thread about - https://www.reddit.com/r/haskell/comments/85vwlq/our_lovely_ghc_parallel_gc_... There you may find .eventlog file and PNG with a screenshot. May be it's time to resurrect Concurrent GC project again? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14981 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler