#10293: CallArity taking 20% of compile time -------------------------------------+------------------------------------- Reporter: simonpj | Owner: nomeata Type: bug | Status: closed Priority: high | Milestone: 7.10.2 Component: Compiler | Version: 7.10.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by AlekseyKliger): I've put together a Gist (by excising code from unbound-generics) that runs into this issue. I've not tried the committed fix yet (don't have a GHC tree around), but perhaps someone else would like to play around with it: https://gist.github.com/lambdageek/c05cd379fe649600070c {{{ $ ghc -c -O Alpha.hs $ ghc -c -v -O Calc.hs # note Calc.hs hangs on "Called arity analysis" }}} To make the compilation take longer, add some more branches to the Expr datatype - Generics are pretty good for building giant blobs of mutually recursive functions. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10293#comment:24 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler