通过 FastCGI 从 NGINX 连接到 PHP 的时间

Question

这是一个具有 32GB 内存的六核。我有 nginx 0.7.X 和 php5-fpm 和 php5.3（来自 dotdeb.org）。重要的配置文件：

nginx.conf

user www-data;
worker_processes 2;
events {
    worker_connections 4096;
}
location ~ \.php$ {
                fastcgi_pass   unix:/tmp/fcgi.sock;
                fastcgi_index  index.php;
                fastcgi_param  SCRIPT_FILENAME  /var/www$fastcgi_script_name;
                include fastcgi_params;
}

php5-fpm.conf

<value name="listen_address">/tmp/fcgi.sock</value>
<value name="max_children">1500</value>
<value name="max_requests">5000</value>

就是这样。使用 apache bench (ab -n 1000 -c 1000 http://url..。) 我可以在 250 毫秒内为 1000 个并发连接请求一个静态文件（大小为 10kB）。

Document Path:          /inc/helper-swf.js
Document Length:        10217 bytes

Concurrency Level:      1000
Time taken for tests:   0.278 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      10448124 bytes
HTML transferred:       10219896 bytes
Requests per second:    3600.30 [#/sec] (mean)
Time per request:       277.755 [ms] (mean)
Time per request:       0.278 [ms] (mean, across all concurrent requests)
Transfer rate:          36734.70 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   27  11.1     30      41
Processing:    16  101  57.1    102     215
Waiting:       15  101  57.1    101     215
Total:         28  128  56.5    136     235

Percentage of the requests served within a certain time (ms)
  50%    136
  66%    167
  75%    178
  80%    184
  90%    198
  95%    205
  98%    220
  99%    228
 100%    235 (longest request)

但是当请求转到一个 php 文件时，这需要 500 毫秒？？？ php什么都不做，文件的第一行是一个die();

Document Path:          /test.php
Document Length:        0 bytes

Concurrency Level:      1000
Time taken for tests:   0.501 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      158000 bytes
HTML transferred:       0 bytes
Requests per second:    1996.99 [#/sec] (mean)
Time per request:       500.754 [ms] (mean)
Time per request:       0.501 [ms] (mean, across all concurrent requests)
Transfer rate:          308.13 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   28   9.5     29      41
Processing:    15  365 117.4    395     448
Waiting:       15  363 117.1    393     448
Total:         27  393 122.9    425     480

Percentage of the requests served within a certain time (ms)
  50%    425
  66%    434
  75%    471
  80%    472
  90%    473
  95%    474
  98%    479
  99%    479
 100%    480 (longest request)

访问php文件时没有内容要传输，只有一个从nginx到php5-fpm的upstream通过socket（tcp耗时800ms，1000个并发连接）。有什么问题？ 日志中没有提示。打开文件限制为 32768。有没有办法从 php-fpm 调整响应时间？

Answer 1

fastcgi 还加载 PHP 实例。如果您的 PHP 充满了脂肪（您不需要的扩展），那么结果就是：每个请求的次数更高。

我的建议是：

• 仅使用您正在使用的扩展重新编译 PHP
• 安装 APC
• 增加缓冲区大小