5 Mar
2007
5 Mar
'07
11:52 a.m.
On Mon, Mar 05, 2007 at 10:23:53AM -0600, John Goerzen wrote:
On Mon, Mar 05, 2007 at 03:20:05PM +0000, Ian Lynagh wrote:
From reading the docs, it sounds like forkIO keeps everything in a single OS thread/process. Doesn't this mean that a program that uses forkIO instead of forkOS loses out on SMP machines?
You can use e.g. +RTS -N2 to use 2 OS threads.
That's rather ugly though, and doesn't "just work". With other languages, I could just use OS threads, and let the OS schedule, say, 15 threads across 2 CPUs, or 4 CPUs, or however I may have.
You can set a default -Nn as described in http://www.haskell.org/ghc/docs/latest/html/users_guide/runtime-control.html... if that helps. Thanks Ian