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1，今天在hacknews上看到很多人對(duì)messagepack的爭(zhēng)論。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，作者解釋說(shuō)有兩大用途：一是Space-efficient storage for Memcache entries (Pinterest)，節(jié)省空間類型的mamcache應(yīng)用；另一個(gè)是用于RPC傳輸， 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,爭(zhēng)議的地方是MessagePack的benchmark說(shuō)，他比protocolBuffer，Json快很多倍。但是有人不相信，做個(gè)Javasript下的測(cè)試（json與messagePack）。發(fā)現(xiàn)MessagePack僅是壓縮后的數(shù)據(jù)比json少10%左右，而壓縮和解壓時(shí)間則和json的解析器比起來(lái)要費(fèi)時(shí)很多。
4，“MsgPack vs. JSON: Cut your client-server exchange traffic by 50% with one line of code”這篇文章使用了messagePack做服務(wù)器的優(yōu)化，降低服務(wù)器的數(shù)據(jù)量，更加合理的利用帶寬。作者強(qiáng)調(diào)了他們寧愿浪費(fèi)客戶端的0.5ms―1ms，但是服務(wù)器使用ruby的MessagePack解析器，效率能夠比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.
復(fù)制代碼 代碼如下:
myJSONString = JSON.stringify(myObject);
myObject = JSON.parse(myJSONString);
var myByteArray = msgpack.pack(myObject);
myObject = msgpack.unpack(myByteArray);
MessagePack作者也認(rèn)為MessagePack may not be the best choice for client-side serialization as described by the blog author.引用2的作者有點(diǎn)小悲劇。
5，BSon是Json的二進(jìn)制形式，但是與JSon有語(yǔ)法不兼容的地方。但是MessagePack保證語(yǔ)義上能夠做到一致。
6，場(chǎng)景需求不同，導(dǎo)致技術(shù)的應(yīng)用有所差異。
php試用MessagePack
It's like JSON. but fast and small.
這句吸引了我，去瞧了下。
官網(wǎng)：http://msgpack.org
官方的安裝方法忽悠人，msgpack目錄下根本沒php目錄...只看到csharp,erlang,go,Java,ruby等目錄。
復(fù)制代碼 代碼如下:
git clone https://github.com/msgpack/msgpack.git
cd msgpack/php
phpize
./configure && make && make install
還是在php官網(wǎng)擴(kuò)展找到了：http://pecl.php.NET/package/msgpack
最后更新時(shí)間：2012-09-14，昨天的版本。
附安裝過程：
復(fù)制代碼 代碼如下:
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，重啟php，完成安裝。
開始測(cè)試：
$data = array(0=>'abcdefghijklmnopqrstuvwxyz',1=>'廈門','abc'=>'1234567890');
分別對(duì)其msgpack_pack，json_encode，serialize，長(zhǎng)度為：50,62,87
然后分別執(zhí)行10000次，耗時(shí)：9.95 毫秒，17.45 毫秒，8.85 毫秒
解開執(zhí)行10000次，耗時(shí)：14.76 毫秒，23.93 毫秒，14.61 毫秒
msgpack的性能至少超過json50%，雖然和serialize其實(shí)速度差不多，但serialize占用空間明顯比較多。
另外，GBK的程序方便了，中文也可以msgpack_pack，用json的話還要批量轉(zhuǎn)換成utf-8之后才能json_encode。
引用：
1，MessagePack官方網(wǎng)站
2，MsgPack vs. JSON: Cut your client-server exchange traffic by 50% with one line of code
HN評(píng)論地址：http://news.ycombinator.com/item?id=4090831
3，My thoughts on MessagePack
HN評(píng)論地址：http://news.ycombinator.com/item?id=4092969
4 JS下MessagePack與JSON性能對(duì)比
HN評(píng)論地址：http://news.ycombinator.com/item?id=4091051
php技術(shù)：php MessagePack介紹，轉(zhuǎn)載需保留來(lái)源！
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