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

How about --ghc-options: stack ghci --ghc-options "+RTS -N8 -RTS" On Mon, Aug 24, 2015 at 1:14 PM, Geraldus wrote:

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 :

...

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 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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