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)，節省空間類型的mamcache應用；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）。發現MessagePack僅是壓縮后的數據比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做服務器的優化，降低服務器的數據量，更加合理的利用帶寬。作者強調了他們寧愿浪費客戶端的0.5ms—1ms，但是服務器使用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，導致技術的應用有所差異。

PHP試用MessagePack

It's like JSON. but fast and small.

這句吸引了我，去瞧了下。

官網：

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。

復制代碼 代碼如下:

git clone https://github.com/msgpack/msgpack.git
cd msgpack/php
phpize
./configure && make && make install

復制代碼 代碼如下:

wget
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

1，MessagePack官方網站

2，MsgPack vs. JSON: Cut your client-server exchange traffic by 50% with one line of code

HN評論地址：?id=4090831

3，My thoughts on MessagePack

HN評論地址：?id=4092969

4 JS下MessagePack與JSON性能對比

HN評論地址：?id=4091051