在redis的一个集合中有上万的元素，这些元素对应对象属性有几个键值，原来通过逐个读取的方式访问，获取集合中所有元素的信息需要300多秒，严重影响性能，google后发现，redis提供pipeline来获取大量数据，改用pipeline实现后缩短到20秒

 

    $redis = Redis.new
    keys = $redis.smembers("userlist")
    res_ids = $redis.pipelined do
      keys.each do |client_id|
        $redis.get("account:#{client_id}:id")
      end 
    end 
    res = $redis.pipelined do
      res_ids.each do |id|
        x = "account:"+id
        lastlogin = $redis.hmget("#{x}:lastlogin","ip","time")
        firstlogin = $redis.hmget("#{x}:firstlogin","ip","time")
        multi_value = $redis.mget(x+":available",x+":network_type",x+":traffic_used",x+":traffic_wifi_used",
                   x+":tasks_today",x+":max_traffic",x+":tasks_wifi_today",x+":tasks_3g_today",
                   x+":tasks_wifi_finished",x+":tasks_3g_finished",x+":tasks_wifi_arrive",
                   x+":tasks_3g_arrive",x+":tasks_wifi_success",x+":tasks_3g_success",
                   x+":month_3g_traffic",x+":month_3g_traffic_yestoday",x+":month_2g_traffic",
                   x+":month_2g_traffic_yestoday",x+":month_wifi_traffic",
                   x+":month_wifi_traffic_yestoday",x+":system_info",x+":province_name",
                   x+":city_name",x+":isp_name",x+":software_version",
                   x+":task:send",x+":task:arrive",x+":task:finish",x+":task:pcapempty",
                   x+":tasks_3g_yestoday",x+":tasks_wifi_yestoday")
       [lastlogin , firstlogin , multi_value ]
      end 
    end