#13830: '+RTS -s' gives incorrect value for work balance in some cases -------------------------------------+------------------------------------- Reporter: duog | Owner: duog Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Debugging | Unknown/Multiple information is incorrect | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by duog): * owner: (none) => duog Comment: The number of garbage collection threads is limited to the number of cores right? I believe that this bug will result in the work balance being significantly under reported if the number of capabilities is much more than the number of gc threads. I don't expect dynamically changing capabilities is very common in the wild, but a number of capabilities several times the number of cores may be, I think I remember a blog post of Simon Marlow's saying that they do that at facebook. I'm assigning this to myself as I have a fix in mind: track a value like (or instead of) cumulative_par_max_copied_bytes. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13830#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler