The Glasgow Haskell Compiler (GHC) uses async I/O to implement all I/O actions (e.g. printing to stdout, opening a socket) and it's completely invisible to the

The Glasgow Haskell Compiler (GHC) uses async I/O to implement all I/O actions (e.g. printing to stdout, opening a socket) and it's completely invisible to the programmer. Bryan O'Sullivan and I have rewritten the implementation used in GHC and GHC 6.14 will offer much better scalability (using epoll/kqueue) than previous version. Just fork of a thread per connection (using forkIO) and just call normal I/O actions. The implementation will multiplex those forkIO threads onto a single OS thread that calls epoll/kqueue.