通过配置CPU参数 worker_cpu_affinity 提升nginx性能
简介Nginx默认没有开启利用多核cpu，我们可以通过增加worker_cpu_affinity配置参数来充分利用多核cpu的性能。cpu是任务处理，计算最关键的资源，cpu核越多，性能就越好。
规则设定
（1）cpu有多少个核，就有几位数，1代表内核开启，0代表内核关闭
（2）worker_processes最多开启8个，8个以上性能就不会再提升了，而且稳定性会变的更低，因此8个进程够用了
示例：linode VPS 最低配，8核CPU，nginx配置信息：
worker_processes 8;
worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000;
CPU工作状况：（输入 top 后，按1 查看）
top - 11:16:56 up 39 days,1:16,2 users,load average: 0.09, 0.07, 0.10
Tasks: 134 total, 1 running, 133 sleeping, 0 stopped, 0 zombie
Cpu0:0.0%us,0.0%sy,0.0%ni, 95.1%id,0.0%wa,0.0%hi,0.0%si,4.9%st
Cpu1:0.0%us,0.0%sy,0.0%ni, 98.8%id,0.0%wa,0.0%hi,0.0%si,1.2%st
Cpu2:2.3%us,0.0%sy,0.0%ni, 92.8%id,0.0%wa,0.0%hi,0.0%si,4.9%st
Cpu3:4.6%us,9.2%sy,0.0%ni, 81.2%id,0.0%wa,0.0%hi,0.0%si,5.0%st
Cpu4:1.9%us,0.0%sy,0.0%ni, 96.1%id,0.0%wa,0.0%hi,0.0%si,1.9%st
Cpu5:0.0%us,0.0%sy,0.0%ni, 98.1%id,0.0%wa,0.0%hi,0.0%si,1.9%st
Cpu6:0.0%us,0.0%sy,0.0%ni,100.0%id,0.0%wa,0.0%hi,0.0%si,0.0%st
Cpu7:0.0%us,0.0%sy,0.0%ni, 96.9%id,0.0%wa,0.0%hi,0.0%si,3.1%st
Mem: 1024884k total, 891244k used, 133640k free, 144852k buffers
Swap: 262140k total, 4172k used, 257968k free, 434072k cached
上面的配置表示：8核CPU，开启8个进程。00000001表示开启第一个cpu内核，00000010表示开启第二个cpu内核，依次类推；有多少个核，就有几位数，1表示该内核开启，0表示该内核关闭。
配置实例：
1、2核CPU，开启2个进程
worker_processes2;
worker_cpu_affinity 01 10;
2、2核CPU，开启4进程
worker_processes 4;
worker_cpu_affinity 01 10 01 10;
3、2核CPU，开启8进程
worker_processes8;
worker_cpu_affinity 01 10 01 10 01 10 01 10;
4、8核CPU，开启2进程
worker_processes2;
worker_cpu_affinity 10101010 01010101;
说明：10101010表示开启了第2,4,6,8内核，01010101表示开始了1,3,5,7内核
通过apache 的ab测试查看nginx对CPU的使用状况：
top - 11:25:53 up 39 days,1:25,2 users,load average: 0.33, 0.11, 0.09
Tasks: 133 total, 3 running, 130 sleeping, 0 stopped, 0 zombie
Cpu0:2.3%us,0.9%sy,0.0%ni, 82.7%id,0.0%wa,0.0%hi,0.0%si, 14.1%st
Cpu1:1.7%us,0.6%sy,0.0%ni, 81.8%id,0.0%wa,0.0%hi,0.0%si, 16.0%st
Cpu2:2.8%us,1.9%sy,0.0%ni, 74.4%id,0.0%wa,0.0%hi,0.0%si, 20.9%st
Cpu3:2.0%us,0.9%sy,0.0%ni, 83.0%id,0.0%wa,0.0%hi,0.0%si, 14.0%st
Cpu4:2.2%us,0.8%sy,0.0%ni, 79.3%id,0.0%wa,0.0%hi,0.0%si, 17.6%st
Cpu5:3.6%us,1.1%sy,0.0%ni, 75.9%id,0.0%wa,0.0%hi,0.0%si, 19.5%st
Cpu6:2.1%us,0.9%sy,0.0%ni, 87.2%id,0.0%wa,0.0%hi,0.0%si,9.8%st
Cpu7:1.7%us,0.6%sy,0.0%ni, 80.6%id,0.0%wa,0.0%hi,0.0%si, 17.1%st
Mem: 1024884k total, 891020k used, 133864k free, 144912k buffers
Swap: 262140k total, 4172k used, 257968k free, 434244k cached
如果多个CPU内核的利用率都相差不多，证明nginx己经成功的利用了多核CPU。
测试结束后，CPU内核的负载应该都同时降低。
通过配置CPU参数 worker_cpu_affinity 提升nginx性能
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