#9706: New block-structured heap organization for 64-bit -------------------------------------+------------------------------------- Reporter: ezyang | Owner: simonmar Type: task | Status: new Priority: normal | Milestone: Component: Runtime | Version: 7.8.3 System | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonmar): There are two parts to this: 1. put all the heap memory together in the address space 2. change where we put the block descriptors Let's just worry about (1) for now. * Windows doesn't overcommit, so we can't do this on Windows * How do we decide what the max heap size should be? Total mem + swap? * I'm worried about the overhead of having to pre-allocate a large number of page tables for the reserved address space * Every Haskell process would show a ridiculous VSIZE Still, from a purely selfish perspective, for those on 64-bit Linux this might make sense and I'd be happy to take that 8% GC win for very little effort, even if it is non-portable. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9706#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler