forkredis.rb

require 'rubygems'
require 'redis'
require 'benchmark'

redis = Redis.new
puts redis['test_counter']
redis['test_counter'] = 0
pids = []
20.times do
  pids << Kernel.fork do
    res = Benchmark.realtime do
      redis = Redis.new
      30000.times do
        redis.incr('test_counter')
      end
    end
    puts res
    exit
  end
end


pids.each do |pid|
  Process.waitpid(pid)
end