pthreads(转)

大多数网站的性能瓶颈不在PHP服务器上,因为它可以简单地通过横向增加服务器或CPU核数来轻松应对(对于各种云主机,增加VPS或CPU核数就更方便了,直接以备份镜像增加VPS,连操作系统、环境都不用安装配置),而是在于MySQL数据库。如果用 MySQL 数据库,一条联合查询的SQL,也许就可以处理完业务逻辑,但是,遇到大量并发请求,就歇菜了。如果用 NoSQL 数据库,也许需要十次查询,才能处理完同样地业务逻辑,但每次查询都比 MySQL 要快,十次循环NoSQL查询也许比一次MySQL联合查询更快,应对几万次/秒的查询完全没问题。如果加上PHP多线程,通过十个线程同时查询NoSQL,返回结果汇总输出,速度就要更快了。我们实际的APP产品中,调用一个通过用户喜好实时推荐商品的PHP接口,PHP需要对BigSea NoSQL数据库发起500~1000次查询,来实时算出用户的个性喜好商品数据,使用pthreads PHP扩展,可以使PHP真正地支持多线程。多线程在处理重复性的循环任务,能够大大缩短程序执行时间

PHP扩展下载:https://github.com/krakjoe/pthreads
PHP手册文档:http://php.net/manual/zh/book.pthreads.php

<?php  
  class test_thread_run extends Thread   
  {  
      public $url;  
      public $data;  

      public function __construct($url)  
      {  
          $this->url = $url;  
      }  

      public function run()  
      {  
          if(($url = $this->url))  
          {  
              $this->data = model_http_curl_get($url);  
          }  
      }  
  }  

  function model_thread_result_get($urls_array)   
  {  
      foreach ($urls_array as $key => $value)   
      {  
          $thread_array[$key] = new test_thread_run($value["url"]);  
          $thread_array[$key]->start();  
      }  

      foreach ($thread_array as $thread_array_key => $thread_array_value)   
      {  
          while($thread_array[$thread_array_key]->isRunning())  
          {  
              usleep(10);  
          }  
          if($thread_array[$thread_array_key]->join())  
          {  
              $variable_data[$thread_array_key] = $thread_array[$thread_array_key]->data;  
          }  
      }  
      return $variable_data;  
  }  

  function model_http_curl_get($url,$userAgent="")   
  {  
      $userAgent = $userAgent ? $userAgent : 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)';   
      $curl = curl_init();  
      curl_setopt($curl, CURLOPT_URL, $url);  
      curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
      curl_setopt($curl, CURLOPT_TIMEOUT, 5);  
      curl_setopt($curl, CURLOPT_USERAGENT, $userAgent);  
      $result = curl_exec($curl);  
      curl_close($curl);  
      return $result;  
  }  

  for ($i=0; $i < 100; $i++)   
  {   
      $urls_array[] = array("name" => "baidu", "url" => "http://www.baidu.com/s?wd=".mt_rand(10000,20000));  
  }  

  $t = microtime(true);  
  $result = model_thread_result_get($urls_array);  
  $e = microtime(true);  
  echo "多线程:".($e-$t)."\n";  

  $t = microtime(true);  
  foreach ($urls_array as $key => $value)   
  {  
      $result_new[$key] = model_http_curl_get($value["url"]);  
  }  
  $e = microtime(true);  
  echo "For循环:".($e-$t)."\n";  
?>  

转自https://www.cnblogs.com/mrxigua/p/3497558.html

可以转载,但必须说明出处

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