#10470: Allocating StablePtrs leads to GC slowdown even after they're freed -------------------------------------+------------------------------------- Reporter: bitonic | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by ezyang): We can't fix this by trying to resize `stable_ptr_table`, however, because if we have a used stable pointer at location 0 and a used stable pointer at location n, we can't resize smaller than n. (We might be able to if we used a hash table, but that would hurt read performance.) So really we need to be more clever about how we traverse the static pointer table, maybe by linking live entries together or something more clever. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10470#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler