sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X
According to the OS X man page for sysctl(https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/sysctlbyname.3.html), 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.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Runtime System |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | simonmar |
| Operating system | |
| Architecture |