Re: Multiplexing alternatives to poll()...

[Steven Hazel <sah@thalassocracy.org>]

Bruce Montrose wrote:
> 
> Read this article comparing the various multiplexing techniques...
> http://www.kegel.com/dkftpbench/Poller_bench.html
> 
> It would seem that either /dev/poll or kqueue could drastically improve our
> multiplexing in the onion router.

A better starting point might be http://www.kegel.com/c10k.html

I've co-authored a couple of /dev/epoll based servers at work.  I'm not
sure how many connections the onion router needs to handle, or how busy
they'll be, but I think it's unlikely that any of these fast event
notification APIs will be required.

If I'm right, that's good news, because these mechanisms are all very
platform-specific, and a number of the better ones have yet to make it
into major OS releases.  If you can get by without using any of these
APIs, that's a win.

If you do decide to use an advanced event notification mechanism, I can
recommend kqueue() as the most mature API, and /dev/epoll as a simple
and effective entry for Linux.

-- 
Steven Hazel
sah@thalassocracy.org