Re: [GHC] #9706: New block-structured heap organization for 64-bit

#9706: New block-structured heap organization for 64-bit -------------------------------------+------------------------------------- Reporter: ezyang | Owner: gcampax Type: task | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: D524 -------------------------------------+------------------------------------- Comment (by Simon Marlow ): In [changeset:"0d1a8d09f452977aadef7897aa12a8d41c7a4af0/ghc" 0d1a8d09/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="0d1a8d09f452977aadef7897aa12a8d41c7a4af0" Two step allocator for 64-bit systems Summary: The current OS memory allocator conflates the concepts of allocating address space and allocating memory, which makes the HEAP_ALLOCED() implementation excessively complicated (as the only thing it cares about is address space layout) and slow. Instead, what we want is to allocate a single insanely large contiguous block of address space (to make HEAP_ALLOCED() checks fast), and then commit subportions of that in 1MB blocks as we did before. This is currently behind a flag, USE_LARGE_ADDRESS_SPACE, that is only enabled for certain OSes. Test Plan: validate Reviewers: simonmar, ezyang, austin Subscribers: thomie, carter Differential Revision: https://phabricator.haskell.org/D524 GHC Trac Issues: #9706 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9706#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler