Is puma the ONLY multi-threaded rails 4 http server?
No. In alphabetical order:
Iodine
a HTTP / Websocket Server & EventMachine alternative (kqueue/epoll based)Net::HTTP::Server
, despite the lack of advertising, supports multithreading- Phusion Passenger has supported multithreading since v4 beta
- Rainbows! supports multiple concurrency models, including multithreading
- Reel is a Celluloid-backed "evented" server, which "also works great for multithreaded applications and provides traditional multithreaded blocking I/O support too"
- Thin has a threaded mode, which can be enabled by passing
--threaded
or by settingthreaded: true
in the appropriate configuration file (e.g.bundle exec thin start --threaded
) - WEBrick is on its own multithreaded, so it's not fair to eliminate it as an option; if you're using the Rails-embedded version, you'll need to monkey-patch
Rails::Server
to enable multi-threading - Zbatery is based on Rainbows! and supports all concurrency models that Rainbows! supports
Note that currently MRI Ruby runs only one thread runs at a time due to its global interpreter lock (GIL). You'll only be truly able to exploit multithreading by using a different Ruby runtime such as JRuby or Rubinius, which provide access to native threads. If you decide to go with JRuby, there are several JVM-dependent servers worth exploring.
Trinidad is nice. A very powerful server for jRuby development:
http://blog.jruby.org/2012/04/two-apps-one-trinidad/
http://railscasts.com/episodes/377-trinidad?view=comments
Here are some good benchmarks (the Trini server beats puma):
http://carlhoerberg.github.io/blog/2012/03/31/jruby-application-server-benchmarks/
A nice Trinidad Server setup tutorial: