Ian Lynagh wrote:
On Mon, Mar 05, 2007 at 08:36:29AM -0600, John Goerzen wrote:
On Mon, Mar 05, 2007 at 12:59:17PM +0000, Simon Marlow wrote:
There seems to be a common misconception that forkOS is necessary to get
certain kinds of concurrency, and forkIO won't do. I don't know where this
comes from: the documentation does seem to be quite clear to me. The only
reason to use forkOS is for interacting with foreign code that uses
thread-local state; everytyhing else can be done with forkIO (and it is
usually better to use forkIO).
>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.
I've added a sentence to the forkOS docs to say that you don't need forkOS to
get parallelism.
Cheers,
Simon
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