#7850: Strangely high memory usage on optimized Ackermann function ---------------------------------+------------------------------------------ Reporter: dolio | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.2 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: Runtime performance bug Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by dolio): I've now built HEAD, and get the same results as monoidal. Both ack and tak run in constant memory even with very small stack chunk sizes. When using -kc2M, HEAD-built ack actually runs slower than 7.6.x -kc2M. And default -kc is quite a bit slower than that, but still much better than freezing the machine. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7850#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler