1，今天在hacknews上看到很多人對messagepack的爭論。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,爭議的地方是MessagePack的benchmark說，他比protocolBuffer，Json快很多倍。但是有人不相信，做個javasript下的測試（json與messagePack）。發(fā)現(xiàn)MessagePack僅是壓縮后的數(shù)據(jù)比json少10%左右，而壓縮和解壓時間則和json的解析器比起來要費時很多。

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。作者強調(diào)了他們寧愿浪費客戶端的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.

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的作者有點小悲劇。

5，BSon是Json的二進制形式，但是與JSon有語法不兼容的地方。但是MessagePack保證語義上能夠做到一致。

6，場景需求不同，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。

還是在PHP官網(wǎng)擴展找到了：http://pecl.php.net/package/msgpack
最后更新時間：2012-09-14，昨天的版本。
附安裝過程：



然后把msgpack.so加到php.ini里，重啟php，完成安裝。

開始測試：
$data = array(0=>'abcdefghijklmnopqrstuvwxyz',1=>'廈門','abc'=>'1234567890');

分別對其msgpack_pack，json_encode，serialize，長度為：50,62,87
然后分別執(zhí)行10000次，耗時：9.95 毫秒，17.45 毫秒，8.85 毫秒
解開執(zhí)行10000次，耗時：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評論地址：http://news.ycombinator.com/item?id=4090831

3，My thoughts on MessagePack

HN評論地址：http://news.ycombinator.com/item?id=4092969

4 JS下MessagePack與JSON性能對比

HN評論地址：http://news.ycombinator.com/item?id=4091051