LibmemcachedStore

An ActiveSupport cache store that uses the C-based libmemcached client through Evan Weaver's Ruby/SWIG wrapper, memcached. libmemcached is fast (fastest memcache client for Ruby), lightweight, and supports consistent hashing, non-blocking IO, and graceful server failover.

This cache is designed for Rails 3+ applications.

Prerequisites

You'll need the memcached gem installed:

gem install memcached

or in your Gemfile

gem 'memcached'

There are no other dependencies.

Installation

Just add to your Gemfile

gem 'rails3_libmemcached_store'

and you're set.

Usage

This is a drop-in replacement for the memcache store that ships with Rails. To enable, set the config.cache_store option to libmemcached_store in the config for your environment

config.cache_store = :libmemcached_store

If no servers are specified, localhost is assumed. You can specify a list of server addresses, either as hostnames or IP addresses, with or without a port designation. If no port is given, 11211 is assumed:

config.cache_store = :libmemcached_store, %w(cache-01 cache-02 127.0.0.1:11212)

Other options are passed directly to the memcached client

config.cache_store = :libmemcached_store, '127.0.0.1:11211', :default_ttl => 3600, :compress => true

You can also use :libmemcached_store to store your application sessions

config.session_store = :libmemcached_store, :namespace => '_session', :expire_after => 1800

Props

Thanks to Brian Aker (http://tangent.org) for creating libmemcached, and Evan Weaver (http://blog.evanweaver.com) for the Ruby wrapper.