#9221: (super!) linear slowdown of parallel builds on 40 core machine -------------------------------------+------------------------------------- Reporter: carter | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #910, #8224 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonmar): @slyfox the GC threads all spin in this `any_work()` loop looking for work they can steal from other threads. It's how the GC work gets distributed amongst the available worker threads. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9221#comment:54 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler