[Twisted-Python] Async file I/O with Linux & Twisted
arnarbi at gmail.com
Thu Dec 20 16:13:26 EST 2007
On Dec 20, 2007 8:36 PM, Itamar Shtull-Trauring <itamar at itamarst.org> wrote:
> > I'm pretty sure you are mistaken. As I understood, libevent provides a
> > portable API on top of whatever async I/O mechanisms there are on the
> > underlying system, selecting the best available implementation.
> > For Linux, I believe this it currently uses epoll, kqueue on freebsd,
> > or select() or poll() on older systems.
> None of those are asynchronous IO. They allow efficient querying of
> readability/writeability, typically used with *non-blocking* IO.
Ah, right, I understand. Sorry about the noise then <:|
Seems I've been using the wrong word for a while then. So is
performance the only reason for preferring asynchronous i/o to
> In design pattern language they are "reactors", whereas async IO would be
> a "proactor." In API land you can tell the difference because with async
> APIs you have a callback: Twisted's Protocol/Transport APIs usually
> convert low-level change events (socket is readable) and non-blocking IO
> (reading the socket) to high-level async callbacks (dataReceived called
> with data).
Kernel level AIO, is that about the kernel providing that abstraction
or is it using the hardware in some entirely different way?
Hope you don't mind naive questions.
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