PHP 并发场景的几种解决方案(2)

日期：2020-05-21 栏目：程序人生浏览：次

使用 ab 测试

$ ab -t 20 -c 10 http://192.168.1.104:9510/

三、利用文件排他锁(非阻塞模式)

非阻塞模式下，如果进程在获取文件排他锁时，其它进程正在占用锁的话，此进程会马上判断获取锁失败，并且继续往下执行。

示例代码：

<?php
$http = new swoole_http_server("0.0.0.0", 9511);

$http->set(array(
  'reactor_num' => 2, //reactor thread num
  'worker_num' => 4  //worker process num
));

$http->on('request', function (swoole_http_request $request, swoole_http_response $response) {

  $uniqid = uniqid('uid-', TRUE);
  $redis = new Redis();
  $redis->connect('127.0.0.1', 6379);

  $fp = fopen("lock.txt", "w+");

  // 非阻塞模式， 如果不希望 flock() 在锁定时堵塞，则给 lock 加上 LOCK_NB
  if(flock($fp,LOCK_EX | LOCK_NB))  //锁定当前指针
  {
   // 成功取得锁后，放心处理订单
    $rest_count = intval($redis->get("rest_count"));
    $value = "{$rest_count}-{$uniqid}";
    if($rest_count > 0){
      // do something ...
      $rand = rand(100, 1000000);
      $sum=0;
      for ($i=0;$i<$rand;$i++){ $sum+=$i; }

      $redis->lPush('uniqids', $value);
      $redis->decr('rest_count');
    }

   // 订单处理完成后，再释放锁
    flock($fp,LOCK_UN);
  } else {
   // 如果获取锁失败，马上进入这里执行
    echo "{$uniqid} - 系统繁忙，请稍后再试".PHP_EOL;
  }
  fclose($fp);

});

$http->start();

使用 ab 测试

$ ab -t 20 -c 10 http://192.168.1.104:9511/

最后给出三种处理方式的测试结果比较

redis 事务方式：

......
Concurrency Level:   10
Time taken for tests:  20.005 seconds
Complete requests:   17537
Failed requests:    0
Total transferred:   2578380 bytes
HTML transferred:    0 bytes
Requests per second:  876.62 [#/sec] (mean)
Time per request:    11.407 [ms] (mean)
Time per request:    1.141 [ms] (mean, across all concurrent requests)
Transfer rate:     125.86 [Kbytes/sec] received
......

文件排他锁（阻塞模式）：

......
Concurrency Level:   10
Time taken for tests:  20.003 seconds
Complete requests:   8205
Failed requests:    0
Total transferred:   1206282 bytes
HTML transferred:    0 bytes
Requests per second:  410.19 [#/sec] (mean)
Time per request:    24.379 [ms] (mean)
Time per request:    2.438 [ms] (mean, across all concurrent requests)
Transfer rate:     58.89 [Kbytes/sec] received
......

文件排他锁（非阻塞模式）：

......
Concurrency Level:   10
Time taken for tests:  20.002 seconds
Complete requests:   8616
Failed requests:    0
Total transferred:   1266846 bytes
HTML transferred:    0 bytes
Requests per second:  430.77 [#/sec] (mean)
Time per request:    23.214 [ms] (mean)
Time per request:    2.321 [ms] (mean, across all concurrent requests)
Transfer rate:     61.85 [Kbytes/sec] received
......

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PHP 并发场景的几种解决方案(2)

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