Swoole2.0内置协程并发测试

来源：https://my.oschina.net/matyhtf/blog/806196

Swoole2.0是一个革命性的版本，它内置了协程的支持。与Go语言协程不同，Swoole协程完全不需要开发者添加任何额外的关键词，直接以过去最传统的同步阻塞模式编写代码，底层自动进行协程调度实现异步IO。使并发编程变得非常简单。

最新的版本中，内置协程已支持PHP7，同时兼具了性能和并发能力，Swoole的强大超乎想象。

本文基于Github最新的Swoole2.0.3版本进行了并发压力测试，来验证Swoole内置协程的并发能力。

测试环境

• 操作系统：Ubuntu 16.04
• 软件版本：PHP-7.0.14 Swoole-2.0.3
• 硬件环境：酷睿I5+8G内存

测试代码

$server = new Swoole\Http\Server('127.0.0.1', 9501, SWOOLE_BASE);$server->set(array('worker_num' => 1));$server->on('Request', function($request, $response) {$mysql = new Swoole\Coroutine\MySQL();$res = $mysql->connect(['host' => '127.0.0.1', 'user' => 'root', 'password' => 'root', 'database' => 'test']);if ($res == false) {$response->end("MySQL connect fail!");return;}$ret = $mysql->query('select sleep(1)');    $response->end("swoole response is ok, result=".var_export($ret, true));});$server->start();

代码非常简单，使用BASE模式创建一个Http服务器，并且设置进程为1，收到Http请求后执行一条select sleep(1)语句，这条SQL模拟了阻塞IO，MySQL的服务器在1秒后返回结果。传统的同步阻塞程序，启动1个进程，毫无疑问只能提供1QPS的处理能力。而Swoole2.0协程不同，它虽然使用同步阻塞方式编写代码，但是底层确是异步IO，即使SQL语言执行时间很长，也可以提供很大的并发能力。

启动程序

php server.phpps aux|grep server.phphtf      13142  0.6  0.2 328480 42268 pts/24   S+   10:17   0:00 php server.php

并发100测试

ab -c 100 -n 1000 http://127.0.0.1:9501/This is ApacheBench, Version 2.3 <$Revision: 1706008 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 127.0.0.1 (be patient)Completed 100 requestsCompleted 200 requestsCompleted 300 requestsCompleted 400 requestsCompleted 500 requestsCompleted 600 requestsCompleted 700 requestsCompleted 800 requestsCompleted 900 requestsCompleted 1000 requestsFinished 1000 requestsServer Software:        swoole-http-serverServer Hostname:        127.0.0.1Server Port:            9501Document Path:          /Document Length:        85 bytesConcurrency Level:      100Time taken for tests:   10.061 secondsComplete requests:      1000Failed requests:        0Total transferred:      233000 bytesHTML transferred:       85000 bytesRequests per second:    99.39 [#/sec] (mean)Time per request:       1006.092 [ms] (mean)Time per request:       10.061 [ms] (mean, across all concurrent requests)Transfer rate:          22.62 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   1.3      0       7Processing:  1000 1004   4.7   1002    1020Waiting:     1000 1004   4.7   1002    1020Total:       1000 1005   5.8   1003    1026Percentage of the requests served within a certain time (ms)  50%   1003  66%   1004  75%   1005  80%   1006  90%   1016  95%   1020  98%   1022  99%   1022 100%   1026 (longest request)

并发1000测试

ab -c 1000 -n 2000 http://127.0.0.1:9501/This is ApacheBench, Version 2.3 <$Revision: 1706008 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 127.0.0.1 (be patient)Completed 200 requestsCompleted 400 requestsCompleted 600 requestsCompleted 800 requestsCompleted 1000 requestsCompleted 1200 requestsCompleted 1400 requestsCompleted 1600 requestsCompleted 1800 requestsCompleted 2000 requestsFinished 2000 requestsServer Software:        swoole-http-serverServer Hostname:        127.0.0.1Server Port:            9501Document Path:          /Document Length:        19 bytesConcurrency Level:      1000Time taken for tests:   2.025 secondsComplete requests:      2000Failed requests:        153   (Connect: 0, Receive: 0, Length: 153, Exceptions: 0)Total transferred:      344098 bytesHTML transferred:       48098 bytesRequests per second:    987.66 [#/sec] (mean)Time per request:       1012.493 [ms] (mean)Time per request:       1.012 [ms] (mean, across all concurrent requests)Transfer rate:          165.94 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    6   6.6      8      18Processing:     8  166 336.4     68    2006Waiting:        8  166 336.4     68    2006Total:          8  173 340.6     83    2022Percentage of the requests served within a certain time (ms)  50%     83  66%     87  75%     89  80%     90  90%   1021  95%   1087  98%   1092  99%   1093 100%   2022 (longest request)

Length: 153 错误是因为MySQL服务器已经无法支持这么大并发了，拒绝了swoole的连接，因此会抛出错误。

php-fpm测试

为了进行对比，本文还做了php-fpm的测试。同样使用PHP7，修改php-fpm.conf将php-fpm进程设置为1。测试的代码与Swoole的完全一致，也是执行同一个sleep的SQL语句。 因为php-fpm是真正的同步阻塞，耗时太长，因此只能使用并发10请求100的方式测试。

测试代码：

$db = new mysqli;$db->connect('127.0.0.1', 'root', 'root', 'test');$result = $db->query("select sleep(1)");if ($result) {    print_r($result->fetch_all());}else die(sprintf("MySQLi Error: %s", mysqli_error($link)));

ab -c 10 -n 100 http://127.0.0.1/mysql.phpThis is ApacheBench, Version 2.3 <$Revision: 1706008 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 127.0.0.1 (be patient).....doneServer Software:        nginx/1.10.0Server Hostname:        127.0.0.1Server Port:            80Document Path:          /mysql.phpDocument Length:        69 bytesConcurrency Level:      10Time taken for tests:   100.086 secondsComplete requests:      100Failed requests:        0Total transferred:      24100 bytesHTML transferred:       6900 bytesRequests per second:    1.00 [#/sec] (mean)Time per request:       10008.594 [ms] (mean)Time per request:       1000.859 [ms] (mean, across all concurrent requests)Transfer rate:          0.24 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   0.1      0       0Processing:  1002 9558 1636.0  10008   10011Waiting:     1002 9558 1636.0  10008   10011Total:       1002 9558 1636.0  10008   10011Percentage of the requests served within a certain time (ms)  50%  10008  66%  10009  75%  10009  80%  10009  90%  10009  95%  10010  98%  10010  99%  10011 100%  10011 (longest request)

结果评价

可以看到Swoole服务器，即使SQL语句要执行1秒才返回结果，并发100的测试中也提供了100qps的能力，并发1000的测试中QPS为987，但MySQL服务器已经无法提供服务了。而同步阻塞的php-fpm处理并发10请求100的测试花费了100秒才完成，QPS为1。

Swoole2.0的内置协程未来可能会颠覆现代软件的开发模式。