[Haskell-cafe] Unable to get parallelism using `par`

[Andrew Coppin]

On 17/02/2011 05:20 PM, Brandon Moore wrote:

> If you are using ghc 7.01, you need to compile with -rtsopts for the compiled
> program to parse +RTS options.

That's true.

> I don't know of any way to provide a default value at compile time.

That would be -with-rtsopts="-N2" (or whatever)

http://www.haskell.org/ghc/docs/7.0-latest/html/users_guide/runtime-control.html#id3095435

But note that with GHC 7.x, the RTS *automatically* chooses the correct 
number of threads now. You no longer need to specify this manually 
(unless you specifically want to use some other number of threads for 
some reason).