#7561: Unnecessary Heap Allocations - Slow Performance -------------------------------+-------------------------------------------- Reporter: wurmli | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.6.1 Keywords: | Os: Linux Architecture: x86_64 (amd64) | Failure: Runtime performance bug Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | -------------------------------+-------------------------------------------- Comment(by simonpj): There seem to be two separate issues here 1. A profiled program runs a lot faster than a non-profiled one 2. Two variants of a program that depends on the (complex) vector library run with very different speeds. Can anyone help boil either (1) or (2) down into a smaller program, or otherwise characterise what's going on? I'm out of bandwidth. Using `-ticky` profiling might help guide you to where the allocation is happening. Thanks Simon -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7561#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler