Explain asynchronous MySQL in swoole HTTP server

Or go directly to the code:

<?php$http = new swoole_http_server("0.0.0.0", 9501);$http->on(&#39;request&#39;, function($request, $response){
    $swoole_mysql1 = new Swoole\Coroutine\MySQL();    $swoole_mysql2 = new Swoole\Coroutine\MySQL();    $swoole_mysql1->connect([        &#39;host&#39; => &#39;127.0.0.1&#39;,        &#39;port&#39; => 3306,        &#39;user&#39; => &#39;root&#39;,        &#39;password&#39; => &#39;root&#39;,        &#39;database&#39; => &#39;swoole&#39;,
    ]);    $swoole_mysql2->connect([        &#39;host&#39; => &#39;127.0.0.1&#39;,        &#39;port&#39; => 3306,        &#39;user&#39; => &#39;root&#39;,        &#39;password&#39; => &#39;root&#39;,        &#39;database&#39; => &#39;swoole&#39;,
    ]);    $res1 = $swoole_mysql1->query(&#39;SELECT * FROM data1&#39;);    $res2 = $swoole_mysql2->query(&#39;SELECT * FROM data2&#39;);    $response->header("Content-Type", "text/html; charset=utf-8");    $response->end("<h1 id="Hello-nbsp-Swoole-nbsp-count-res-count-res">Hello Swoole. #".count($res1).count($res2)."</h1>");

});$http->start();

Recommended (free): swoole

## Use browse server access. http://ip:9501

Asynchronous MySQL does not need to wait for the first query to be completed before executing the second query. The effect is more obvious when accessing different servers, different databases, and different tables.
Compare the synchronous MySQL query code:

<?php$http = new swoole_http_server("0.0.0.0", 9501);$http->on(&#39;request&#39;, function($request, $response){    $swoole_mysql1 = mysqli_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;root&#39;, &#39;swoole&#39;, 3306);    $swoole_mysql2 = mysqli_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;root&#39;, &#39;swoole&#39;, 3306);    $res1 = $swoole_mysql1->query(&#39;SELECT * FROM data1&#39;);    $res2 = $swoole_mysql2->query(&#39;SELECT * FROM data2&#39;);    $response->header("Content-Type", "text/html; charset=utf-8");    $response->end("<h1 id="Hello-nbsp-Swoole-nbsp-res-num-rows-res-num-rows">Hello Swoole. #".$res1->num_rows.$res2->num_rows."</h1>");

});$http->start();

The synchronization code uses PHP native method to query data.

Put the performance test using ab for two query methods:
ab -c 100 -n 1000 http://127.0.0.1:9501/
Asynchronous query:

Server Software:        swoole-http-server
Server Hostname:        127.0.0.1Server Port:            9501Document Path:          /
Document Length:        30 bytesConcurrency Level:      100Time taken for tests:   1.477 secondsComplete requests:      1000Failed requests:        0Write errors:           0Total transferred:      193000 bytesHTML transferred:       30000 bytesRequests per second:    676.82 [#/sec] (mean)Time per request:       147.749 [ms] (mean)
Time per request:       1.477 [ms] (mean, across all concurrent requests)
Transfer rate:          127.57 [Kbytes/sec] received

Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    1   1.8      0       7Processing:     4  140  24.0    145     156Waiting:        0  140  24.1    145     156Total:          7  140  22.6    145     160Percentage of the requests served within a certain time (ms)  50%    145
  66%    146
  75%    148
  80%    148
  90%    150
  95%    152
  98%    153
  99%    154
 100%    160 (longest request)

Synchronous query:

Server Software:        swoole-http-server
Server Hostname:        127.0.0.1Server Port:            9501Document Path:          /
Document Length:        30 bytesConcurrency Level:      100Time taken for tests:   2.765 secondsComplete requests:      1000Failed requests:        0Write errors:           0Total transferred:      193000 bytesHTML transferred:       30000 bytesRequests per second:    361.67 [#/sec] (mean)Time per request:       276.493 [ms] (mean)
Time per request:       2.765 [ms] (mean, across all concurrent requests)
Transfer rate:          68.17 [Kbytes/sec] received

Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   0.4      0       2Processing:     4  262  48.5    272     295Waiting:        4  262  48.5    272     295Total:          6  262  48.2    272     295Percentage of the requests served within a certain time (ms)  50%    272
  66%    278
  75%    281
  80%    284
  90%    287
  95%    291
  98%    293
  99%    294
 100%    295 (longest request)

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