php MessagePack介绍
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 JSONis,that MsgPack isbinary-based- this gives the possibility to make the exchanged dataa) 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 parseandencode,having a parser parse 40 bytes takes about twice as long as parsing 20 bytes. 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。 PHP试用MessagePack It's like JSON. but fast and small. 这句吸引了我,去瞧了下。 官网:http://msgpack.org 官方的安装方法忽悠人,msgpack目录下根本没php目录...只看到csharp,erlang,go,java,ruby等目录。 代码如下: git clone https://github.com/msgpack/msgpack.git 还是在PHP官网扩展找到了:http://pecl.php.net/package/msgpack cd msgpack/php phpize ./configure && make && make install 最后更新时间:2012-09-14,昨天的版本。 附安装过程: 代码如下: wget http://pecl.php.net/get/msgpack-0.5.2.tgz 然后把msgpack.so加到php.ini里,重启php,完成安装。 开始测试: 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 $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: 3,My thoughts on MessagePack HN评论地址: 4 JS下MessagePack与JSON性能对比 HN评论地址: (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |