#8732: Global big object heap allocator lock causes contention --------------------------------------------+------------------------------ Reporter: tibbe | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Runtime System | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by simonmar): It's even harder than that, because a block can be allocated by one thread and freed by another thread, so we lose block coalescing, even if it can be made to work safely. So I suggest if we want to do anything at all here, we just do the really simple thing: we allocate a chunk of contiguous memory, keep it in the capability, and use that to satisfy large block requests if it's large enough. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8732#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler