php MessagePack介绍 |
本文标签:php,MessagePack 1,今天在hacknews上看到很多人对messagepack的争论 。首先了解什么是MessagePack:MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small. 2,MessagePack的主要用途,作者解释说有两大用途:一是Space-efficient storage for Memcache entries (Pinterest),节省空间类型的mamcache应用;另一个是用于RPC传输, This use case is fairly close to my original intent. When one is designing an RPC system, one of the first tasks is to specify and implement a communication protocol. This process can get pretty hairy as you need to worry about a lot of low-level issues like Endian-ness. By using MessagePack, one can skip designing and implementing a communication protocol entirely and accelerate development. 3,争议的地方是MessagePack的benchmark说,他比protocolBuffer,Json快很多倍 。但是有人不相信,做个javasript下的测试(json与messagePack) 。发现MessagePack仅是压缩后的数据比json少10%左右,而压缩和解压时间则和json的解析器比起来要费时很多 。 4,“MsgPack vs. JSON: Cut your client-server exchange traffic by 50% with one line of code”这篇文章使用了messagePack做服务器的优化,降低服务器的数据量,更加合理的利用带宽 。作者强调了他们宁愿浪费客户端的0.5ms—1ms,但是服务器使用ruby的MessagePack解析器,效率能够比JSON快5倍 。 The difference to JSON is, that MsgPack is binary-based - this gives the possibility to make the exchanged data a) smaller and use less bytes, I guess we all know the advantages of that, however there is an even bigger advantage: b) It is faster to parse and encode, having a parser parse 40 bytes takes about twice as long as parsing 20 bytes. 复制代码 代码如下: myJSONString = JSON.stringify(myObject); myObject = JSON.parse(myJSONString); var myByteArray = msgpack.pack(myObject); myObject = msgpack.unpack(myByteArray); MessagePack作者也认为MessagePack may not be the best choice for client-side serialization as described by the blog author.引用2的作者有点小悲剧 。 5,BSon是Json的二进制形式,但是与JSon有语法不兼容的地方 。但是MessagePack保证语义上能够做到一致 。 6,场景需求不同,导致技术的应用有所差异 。 复制代码 代码如下: git clone https://github.com/msgpack/msgpack.git cd msgpack/php phpize ./configure && make && make install 还是在PHP官网扩展找到了:http://pecl.php.net/package/msgpack 最后更新时间:2012-09-14,昨天的版本 。 附安装过程: 复制代码 代码如下: wget http://pecl.php.net/get/msgpack-0.5.2.tgz tar zxf msgpack-0.5.2.tgz cd msgpack-0.5.2 /usr/local/hx/php/bin/phpize ./configure --with-php-config=/usr/local/hx/php/bin/php-config make && make install 然后把msgpack.so加到php.ini里,重启php,完成安装 。 开始测试: $data = array(0=>abcdefghijklmnopqrstuvwxyz,1=>厦门,abc=>1234567890); 分别对其msgpack_pack,json_encode,serialize,长度为:50,62,87 然后分别执行10000次,耗时:9.95 毫秒,17.45 毫秒,8.85 毫秒 解开执行10000次,耗时:14.76 毫秒,23.93 毫秒,14.61 毫秒 msgpack的性能至少超过json50%,虽然和serialize其实速度差不多,但serialize占用空间明显比较多 。 另外,GBK的程序方便了,中文也可以msgpack_pack,用json的话还要批量转换成utf-8之后才能json_encode 。 引用: 1,MessagePack官方网站 2,MsgPack vs. JSON: Cut your client-server exchange traffic by 50% with one line of code HN评论地址:http://news.ycombinator.com/item?id=4090831 3,My thoughts on MessagePack HN评论地址:http://news.ycombinator.com/item?id=4092969 4 JS下MessagePack与JSON性能对比 HN评论地址:http://news.ycombinator.com/item?id=4091051 |