#8594: sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X ------------------------------------+--------------------------------- Reporter: kseo | Owner: simonmar Type: task | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.6.3 Keywords: | Operating System: MacOS X Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+--------------------------------- According to the OS X man page for sysctl(https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPa...), HW_NCPU used by the current implementation of getNumberOfProcessors() is deprecated. Instead, Mac OS X provides the following 4 options: * hw.physicalcpu: The number of physical processors available in the current power management mode. * hw.physicalcpu_max: The maximum number of physical processors that could be available this boot. * hw.logicalcpu: The number of logical processors available in the current power management mode. * hw.logicalcpu_max: The maximum number of logical processors that could be available this boot. I am not sure which one fits best to GHC runtime. Any idea? sysconf implementation of getNumberOfProcessors() seems to prefer _SC_NPROCESSORS_ONLN to _SC_NPROCESSORS_CONF when both are defined. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8594 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler