#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 System | Version: 8.4.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by varosi): I tried different nursery sizes. Even up to 300Mb, but the problem is that memory bandwidth has a cost and even with 128Gb of RAM, using more memory just slows down total run times/throughput. btw, I have written more on what I tried here: https://www.reddit.com/r/haskell/comments/85vwlq/our_lovely_ghc_parallel_gc_... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14981#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler