nginx+php-fpm性能参数优化原则

1.worker_processes 越大越好（一定数量后性能增加不明显）

2.worker_cpu_affinity 所有cpu平分worker_processes 要比每个worker_processes 都跨cpu分配性能要好;不考虑php的执行，测试结果worker_processes数量是cpu核数的2倍性能最优

3.unix domain socket（共享内存的方式）要比tcp网络端口配置性能要好

不考虑backlog，请求速度有量级的飞跃，但错误率超过50%

加上backlog，性能有10%左右提升

4.调整nginx、php-fpm和内核的backlog（积压），connect() to unix:/tmp/php-fpm.socket failed (11: Resource temporarily unavailable) while connecting to upstream错误的返回会减少

nginx：

配置文件的server块

listen 80 default backlog=1024;

php-fpm:

配置文件的

listen.backlog = 2048

kernel参数：

/etc/sysctl.conf，不能低于上面的配置

net.ipv4.tcp_max_syn_backlog = 4096

net.core.netdev_max_backlog = 4096

5.增加单台服务器上的php-fpm的master实例，会增加fpm的处理能力，也能减少报错返回的几率

多实例启动方法，使用多个配置文件：

/usr/local/php/sbin/php-fpm -y /usr/local/php/etc/php-fpm.conf &

/usr/local/php/sbin/php-fpm -y /usr/local/php/etc/php-fpm1.conf &

nginx的fastcgi配置

    upstream phpbackend {

#      server   127.0.0.1:9000 weight=100 max_fails=10 fail_timeout=30;

#      server   127.0.0.1:9001 weight=100 max_fails=10 fail_timeout=30;

#      server   127.0.0.1:9002 weight=100 max_fails=10 fail_timeout=30;

#      server   127.0.0.1:9003 weight=100 max_fails=10 fail_timeout=30;

      server   unix:/var/www/php-fpm.sock weight=100 max_fails=10 fail_timeout=30;

      server   unix:/var/www/php-fpm1.sock weight=100 max_fails=10 fail_timeout=30;

      server   unix:/var/www/php-fpm2.sock weight=100 max_fails=10 fail_timeout=30;

      server   unix:/var/www/php-fpm3.sock weight=100 max_fails=10 fail_timeout=30;

#      server   unix:/var/www/php-fpm4.sock weight=100 max_fails=10 fail_timeout=30;

#      server   unix:/var/www/php-fpm5.sock weight=100 max_fails=10 fail_timeout=30;

#      server   unix:/var/www/php-fpm6.sock weight=100 max_fails=10 fail_timeout=30;

#      server   unix:/var/www/php-fpm7.sock weight=100 max_fails=10 fail_timeout=30;

    }

        location ~ \.php* {

            fastcgi_pass   phpbackend;

#           fastcgi_pass   unix:/var/www/php-fpm.sock;

            fastcgi_index index.php;

       ..........

       }

6.测试环境和结果

内存2G

swap2G

cpu 2核 Intel(R) Xeon(R) CPU E5405  @ 2.00GHz

采用ab远程访问测试，测试程序为php的字符串处理程序

1）在开4个php-fpm实例，nginx 8个worker_processes 每个cpu4个worker_processes ，backlog为1024，php的backlog为2048，内核backlog为4096，采用unix domain socket连接的情况下，其他保持参数不变

性能和错误率较为平衡，可接受，超过4个fpm实例，性能开始下降，错误率并没有明显下降

结论是fpm实例数，worker_processes数和cpu保持倍数关系，性能较高

影响性能和报错的参数为

php-fpm实例，nginx worker_processes数量，fpm的max_request，php的backlog，unix domain socket

10W请求，500并发无报错，1000并发报错率为0.9%

500并发：

Time taken for tests:   25 seconds avg.

Complete requests:      100000

Failed requests:        0

Write errors:           0

Requests per second:    4000 [#/sec] (mean) avg.

Time per request:       122.313 [ms] (mean)

Time per request:       0.245 [ms] (mean, across all concurrent requests)

Transfer rate:          800 [Kbytes/sec] received avg.

1000并发：

Time taken for tests:   25 seconds avg.

Complete requests:      100000

Failed requests:        524

   (Connect: 0, Length: 524, Exceptions: 0)

Write errors:           0

Non-2xx responses:      524

Requests per second:    3903.25 [#/sec] (mean)

Time per request:       256.197 [ms] (mean)

Time per request:       0.256 [ms] (mean, across all concurrent requests)

Transfer rate:          772.37 [Kbytes/sec] received

2）在其他参数不变，unix domain socket换为tcp网络端口连接，结果如下

500并发：

Concurrency Level:      500

Time taken for tests:   26.934431 seconds

Complete requests:      100000

Failed requests:        0

Write errors:           0

Requests per second:    3712.72 [#/sec] (mean)

Time per request:       134.672 [ms] (mean)

Time per request:       0.269 [ms] (mean, across all concurrent requests)

Transfer rate:          732.37 [Kbytes/sec] received

1000并发：

Concurrency Level:      1000

Time taken for tests:   28.385349 seconds

Complete requests:      100000

Failed requests:        0

Write errors:           0

Requests per second:    3522.94 [#/sec] (mean)

Time per request:       283.853 [ms] (mean)

Time per request:       0.284 [ms] (mean, across all concurrent requests)

Transfer rate:          694.94 [Kbytes/sec] received

与1）比较，有大约10%的性能下降

7. 5.16调整fpm的max_request参数为1000，并发1000报错返回降到200个以下，

Transfer rate在800左右