Eventmachine talk - Jun 2007 - Epoll implementation ready for you all to try

All, per popular request, there is now an epoll implementation in the EM
head revision. It seems to work quite well and hasn''t introduced any
instabilities as far as I can tell. It blows through the 1024-descriptor
limit with ease, and it seems to be faster than the select-based EM even
with smaller descriptor sets. I''ve tested it up to 20,000 sockets, but
50,000 or more should be possible. It exhibits that especially desirable
behavior (familiar from all the epoll benchmarks you''ve seen) that it
runs
at full speed with a few active descriptors and a very large number of quiet
ones.


Obviously this will only work on Linux 2.6 kernels, and since it''s
still a
provisional implementation, you have to specifically request it in your
program. Eventually I expect it to become the default on platforms that
support it. There is also an API that increases the size of the process
descriptor table at runtime (Ruby defaults it to 1024). Obviously you need
to be root to do that, so there''s also a new API that lets you drop
superuser privileges after you set the descriptor-table size.

If anyone wants to try it out, let me know and I''ll support you
directly.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://rubyforge.org/pipermail/eventmachine-talk/attachments/20070607/f7ac552c/attachment.html