#9314: Each object file in a static archive file (.a) is loaded into its own mmap()ed page -------------------------------------+------------------------------------- Reporter: kazu-yamamoto | Owner: Type: bug | Status: new Priority: high | Milestone: 8.0.1 Component: Runtime System | Version: 7.8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hsyl20): @simonmar wrote: "I like not having to memcpy all the memory for an object file into the 1-2GB region, we just mmap it - this is also useful because various tools (like perf) understand the mapping and can give symbol names. For .a files I think it's fine to memcpy the bits though." (https://phabricator.haskell.org/D985#26591) I think that's why D975 doesn't bring the memory improvement while D985 did. Maybe we should add a flag (or use -g) to switch between the mmap mode that tools like perf understand and the memcpy mode that is much cheaper (the latter becoming the default mode). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9314#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler