目录：
- 消息队列的简介
- 性能测试
消息队列（Message Queue）：把消息按照产生的次序加入队列，而由另外的处理程序/模块将其从队列中取出，并加以处理；从而形成了一个基本的消息队列。应用场景：短信服务、电子邮件服务、图片处理服务、好友动态推送服务等。 更多可以看看这篇文章
这里主要做了以下几个实现：
- redis+list
- mongodb+index+timestamp
- memcached+pointer
- amqp+rabbitmq
性能测试使用的是QueueBench.php实现的，其环境参数与测试结果如下:
php: 5.4.40
Linux: 3.13.0-34-generic(buildd@allspice) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) )
memory: 4GB
cpu: Intel(R)_Core(TM)_i5@3.00GHz*4
redis: 3.0.1
php-redis: 2.2.7
mongodb: mongodb-linux-x86_64-ubuntu1404-3.0.2
php-mongo: 1.6.7
memcached: 1.4.24
php-memcached: 2.2.0
redis的数据如下：
class: RedisQueue
push
times: 100 num: 10000
request: 1000000
faild: 0
max: 0.37430000305176 s/10000times
min: 0.26855707168579 s/10000times
takes: 32.56348824501 s
average: 0.3256348824501 s/10000times
rqs: 30709
pop
times: 100 num: 10000
request: 1000000
faild: 0
max: 0.28984785079956 s/10000times
min: 0.21943783760071 s/10000times
takes: 26.595669269562 s
average: 0.26595669269562 s/10000times
rqs: 37600
mongodb+index的数据如下：
class: MongodbQueue
push
times: 100 num: 10000
request: 1000000
faild: 0
max: 1.8860659599304 s/10000times
min: 1.038162946701 s/10000times
takes:115.00487303734 s
average: 1.1500487303734 s/10000times
rqs: 8695
pop
times: 100 num: 10000
request: 1000000
faild: 0
max: 2.2940940856934 s/10000times
min: 1.8466329574585 s/10000times
takes: 197.70558190346 s
average: 1.9770558190346 s/10000times
rqs: 5058
mongodb+noindex的数据如下:
class: MongodbQueue
push
times: 100 num: 10000
request: 1000000
faild: 0
max: 1.4391729831696 s/10000times
min: 1.0708310604095 s/10000times
takes: 120.37140989304 s
average: 1.2037140989304 s/10000times
rqs: 8307
//下面根本跑不动了
memcached的数据如下:
class: MemcachedQueue
push
times: 100 num: 10000
request: 1000000
faild: 0
max: 0.83561706542969 s/10000times
min: 0.67476201057434 s/10000times
takes: 76.049747467041 s
average: 0.76049747467041 s/10000times
rqs: 13149
pop
times: 100 num: 10000
request: 1000000
faild: 0
max: 1.3662950992584 s/10000times
min: 1.2345328330994 s/10000times
takes: 129.71623921394 s
average: 1.2971623921394 s/10000times
rqs: 7709
rabbitmq的数据如下:
class: RabbitQueue
push
times: 100 num: 5000
request: 500000
faild: 0
max: 0.56668591499329 s/5000times
min: 0.019957065582275 s/5000times
takes: 17.697237014771 s
average: 0.17697237014771 s/5000times
rqs: 28252
pop
times: 100 num: 5000
request: 500000
faild: 0
max: 1.709969997406 s/5000times
min: 0.56408095359802 s/5000times
takes: 85.071734666824 s
average: 0.85071734666824 s/5000times
rqs: 5877
VMware 10
centos 6.6
memory 2GB
cpu i5*4
关于rabbitmq的更多信息，请看这里
可以看出：
- 可以看出redis在push上是mongodb的3.53倍,在pop上是mongodb的7.43倍.
- mongodb没有索引,pop根本跑不动了。过了10多秒，我进数据库一看，才删除了99条.
- 可以看出redis的push是memcached的2.3倍,redis的pop是memcached的4.5倍.
- rabbitmq性能并不是最优的