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.html#v%3AnumCapabilities

This variable is new in GHC 6.8.1 (thanks, Simon!), so don't try to use it with an older release.

        <b
_______________________________________________
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe

Reply via email to