From: Francis Cianfrocca <garbagecat10@...>
Date: 2007-07-12T01:33:41+09:00
Subject: [ANN] Eventmachine 0.8.0 released with epoll, breaks Ruby file-descriptor limit

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The Eventmachine team is pleased to announce the release of version 0.8.0,
available now on RubyForge as a tarball and as a gem.

Eventmachine is a framework for writing fast, scalable network-aware
programs (clients, servers, or both) in Ruby or C/C++, without requiring the
use of threads. EM is used today in a variety of production systems
including Web, mail, and LDAP/RADIUS servers, SNMP agents, and custom
protocol handlers. It's also used in Kirk Haines's Swiftiply, a fast
clustering proxy for Rails and other web frameworks.

The 0.8.0 release adds automatic support for epoll, on Linux 2.6 kernels.
This enables Eventmachine programs to break through Ruby's limit of 1024
file and socket descriptors per process. In performance tests designed to
simulate busy web servers, Eventmachine with epoll exhibits the behavior you
would expect: with very large numbers (>20,000) of quiet connections and a
few active ones, there is no noticeable degradation of responsiveness or
total throughput, compared to cases with only a few connections.

We expect the next major EM release to be called 0.9.0. It will add
Erlang-like features intended to make it simple for EM-based programs to
send messages to each other, or to other processes. A typical use case for
this capability is a "service" web site that must make calls to other web
sites, web services, or other network services in order to fulfill requests
from its own clients.

Thanks to all for your support of the EM project, and especially to Tony
Arcieri, who tirelessly bugged me for weeks to add the epoll support, and to
Kirk for helping to shake it out.

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