#9221: (super!) linear slowdown of parallel builds on 40 core machine -------------------------------------+------------------------------------- Reporter: carter | Owner: Type: bug | Status: new Priority: high | Milestone: 7.12.1 Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #910, #8224 | Differential Revisions: -------------------------------------+------------------------------------- Changes (by bgamari): * cc: scpmw (added) Comment: @scpmw, would it be possible to identify the expressions being blackholed (assuming that is indeed what is happening here) from `perf`'s output? It seems like this might be a good use-case for our new DWARF support if so. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9221#comment:37 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler