#12896: Consider using compact regions in GHC itself to reduce GC overhead -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonmar): I actually tried using it for interface files, but it won't work (yet). We can't compact pinned memory, and FastString is implemented in terms of ByteString, which is backed by pinned memory. Perhaps we ought to special-case this somehow, because compacting things involving ByteString would be really useful - it would be possible but we have to adjust the address stored in the ByteString when we copy it. (or fix ByteString to use unpinned memory, which we want to do anyway, but that's harder). Also I'm not 100% sure that there aren't functions buried somewhere in ModIface, which also can't be compacted. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12896#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler