#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 ezyang): It is a good thing that these blocks are considered big blocks, since we don't really want to be copying the buffers around. So one thought might be to make the large block list in generation-0 per-thread, and perform allocations from a thread-local block list. But you have to be careful: objects that are larger than a block need contiguous blocks, so unless you are only going to enable this for large objects that still fit in a single block, you'll have to maintain multiple lists with the sizes you want. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8732#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler