Andrew Coppin wrote:
Dan Weston wrote:
Silly or not, if I compile with -threaded, I always link in the one-liner C file:
char *ghc_rts_opts = "-N2";
Ah... you learn something useful every day! I was going to ask on IRC whether there's any way to do this - but now I don't need to bother. :-)
But wait, there's more! If you're using the threaded RTS, you often
need to know how many threads you can run concurrently, for example to
explicitly split up a compute-bound task. This value is exposed at
runtime by the numCapabilities variable in the GHC.Conc module.
http://www.haskell.org/ghc/docs/latest/html/libraries/base-3.0.0.0/GHC-Conc....
This variable is new in GHC 6.8.1 (thanks, Simon!), so don't try to use
it with an older release.