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

[Geraldus]

Ok, now it shows me eight cores.  So, I've passed arguments incorrectly,
what is the correct way to do this?

*(Also, `$(stack exec which ghci) +RTS -N8` does not work with fish shell
which I'm using by default, but I tested your suggestion in bash)*

пн, 24 авг. 2015 г. в 14:37, Michael Snoyman <michael at snoyman.com>:

> 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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>>
>
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