Default value for numCapabilities?

Simon Marlow marlowsd at
Wed Apr 28 04:26:02 EDT 2010

On 28/04/2010 03:02, Dimitry Golubovsky wrote:
> Hi,
> Interesting: my program is compiled with -threaded, and when I run it
> with +RTS -N I get:
> <program name>: forking not supported with +RTS -N<n>  greater than 1
> This is probably about forkProcess rather than forkIO/forkOS, but why
> this limitation? rawSystem works fine from within a thread started by
> forkIO, but why cannot I use forkProcess?

No good reason, other than it's tremendously difficult to implement.


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