redis-volatile-ttl.rb

#!/usr/bin/env ruby
STDOUT.sync = true

require 'redis'

pid = spawn("redis-server", [:out, :err] => '/dev/null')
sleep 2

r = Redis.new
used_memory = r.info['used_memory'].to_i
maxmemory = used_memory + 1024*20 # 20kb
r.config(:set, 'maxmemory', maxmemory)

%w(volatile-lru volatile-ttl).each do |policy|
  puts "==== maxmemory-policy = #{policy} ===="
  r.config(:set, 'maxmemory-policy', policy)

  [3, 676].each do |samples|
    puts "==== maxmemory-samples = #{samples} ===="
    r.config(:set, 'maxmemory-samples', samples)

    10.times do |n|
      r.flushall

      puts "==== #{n} ===="
      keys = ('a'..'z')
      expires = 86400.step(0, -5)
      keys.each do |k|
        keys.each do |j|
          expire = expires.next
          key = "#{k}:#{j}:#{expire}"
          value = '0' * 1024
          r.setex(key, expire, value)
          sleep 0.01
        end
      end
      puts r.keys('*').sort
    end

    puts ""
  end

  puts ""
end

Process.kill(:INT, pid)