rdb_bloater.rb

require 'redis'

class Bloater
  def clear!
    redis.flushdb
  end
  
  def bloat!(size)
    i = 0
    while(redis_size < size) do
      inject("key_#{i += 1}")
    end
  end
  
  def redis_size
    redis.info["used_memory"].to_i
  end
  
  private
  def inject(key)
    redis.set(key, data)
  end
  
  def data
    `dd if=/dev/urandom bs=1024000 count=1`
  end

  def redis
    @redis ||= Redis.new
  end
end

bloater = Bloater.new
bloater.clear!
bloater.bloat! ARGV.shift