#11054: GHC on Windows could not use more than 64 logical processors -------------------------------------+------------------------------------- Reporter: varosi | Owner: Phyx- Type: feature request | Status: closed Priority: normal | Milestone: 8.2.1 Component: Runtime System | Version: 7.10.2 Resolution: fixed | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Runtime | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #12602 | Differential Rev(s): Phab:D2533 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Phyx-): Ah ok, the first version (the one on the diff) spawns only 9 threads the one here 88 threads. In any case I'll add some more debugging info to the build and send a new one. Also how are you measuring this, just using task manager? When I was testing this I noticed task manager wasn't cpu group aware (at least for my test setup). Only resource monitor and Windows performance analyzer were able to give me accurate information. I assume the system is a production system which doesn't have Windows Performance analyzer? That would give an accurate view of what each thread is doing. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11054#comment:37 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler