[Haskell-cafe] getNumCapabilities always returns 1 with GHC 7.10.2 on OS X

[Michael Snoyman]

It looks like you're sending the RTS options to `stack` in the first one,
not to ghci itself. What's the result with `$(stack exec which ghci) +RTS
-N8`?

On Mon, Aug 24, 2015 at 12:32 PM, Geraldus <heraldhoi at gmail.com> wrote:

> I have OS X Yosemite 10.10.4.  There are two bundles of GHC (from
> ghcformacosx.github.io): 7.10.1 and 7.10.2.  The latter always shows me
> one core when running `getNumCapabilities` action:
>
> *GHC 7.10.2*
> > stack ghci +RTS -N8
> Using resolver: lts-3.0 from global config file:
> /Users/arthurfayzrakhmanov/.stack/global/stack.yaml
> Configuring GHCi with the following packages:
> GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
> Prelude> :m +Control.Concurrent
> Prelude Control.Concurrent> getNumCapabilities
> 1
>
>
> *GHC 7.10.1*
> > /Applications/ghc-7.10.1.app/Contents/bin/ghci +RTS -N8
> GHCi, version 7.10.1: http://www.haskell.org/ghc/  :? for help
> Prelude> :m +Control.Concurrent
> Prelude Control.Concurrent> getNumCapabilities
> 8
>
> It looks like a 7.10.2 bug, can some one confirm that?
>
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