On Nov 28, 2005, at 11:32 AM, Simon Marlow wrote:
On Unix with -threaded, all blocking I/O using Handles or sockets goes via the I/O manager thread, which multiplexes all the blocked I/O requests into a single select() call. If you have 20k blocked socket reads, there will be 20k lightweight Haskell threads, and probably 2 or 3 real OS threads. Without -threaded the outcome is pretty much the same, except the runtime does the select().
I'm not well-versed on the differences between select in the I/O manager and the runtime. What is the difference? Should I just plug - threaded into my cabal file and not worry about it? How big of an impact is select() in the runtime?
On Windows, unfortunately you'll get 20k OS threads for this scenario (regardless of -threaded), because we haven't implemented the I/O manager on Windows yet.
I will dump Windows any day. Thanks, Joel -- http://wagerlabs.com/