getNumProcessors semantics dont match documentation

Hi,

The documentation of getNumProcessors says : "Returns the number of CPUs that the machine has", but it is true only for program compiled with -threaded option. https://hackage.haskell.org/package/base-4.9.0.0/docs/GHC-Conc-Sync.html#v:getNumProcessors

I guess the documentation is just misleading. Or is it a bug ?

Regards

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/base
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changed weight to 5

added Tbug Trac import core libraries labels

The function getNumberOfProcessors also used in rts to decide the number of capabilities.Should we update the documentation as "Returns the number of CPUs that **the runtime can use**" ?

Yes we should.

I think this function returns the number of logical cores, including hyper-threading. It would be good to specify this in the documentation.

added Pnormal label