Cachetastic-memcache-pool is a project mainly written in Ruby, it's free.
Memcache Adapter with Connection Pooling for Cachetastic
This is a memcached adapter for cachetastic that shares connections for caches with the same server list and mc_options configuration. The configuration for this adapter is the same as for the built-in memcached adapter.
configatron.cachetastic.defaults.adapter = Cachetastic::Adapters::MemcachePool::Adapter