【nginx|nginx性能优化_CPU亲和】
为什么要绑定 Nginx 进程到不同的 CPU 上？
默认情况下，Nginx 的多个进程有可能跑在某一个 CPU 或 CPU 的某一核上，导致 Nginx 进程使用硬件的资源不均，因此绑定 Nginx 进程到不同的 CPU 上是为了充分利用硬件的多 CPU 多核资源的目的。不同worker的工作进程绑定到不同的CPU上，减少不同的worker间切换CPU的频率，减小性能损耗查看cpu数及cpu核心数：
#查看cpu个数
[root@zq]# grep -c processor /proc/cpuinfo
4#有4个物理cpu
[root@zq]# cat /proc/cpuinfo| grep 'physical id' | sort|uniq|wc -l
4#单cpu有1个cpu核心
[root@zq]# cat /proc/cpuinfo| grep 'cpu cores'|uniq
cpu cores: 1总共有4*1=4个核心[root@zq]# top#top命令，再按键盘上的“1”，显示当前核心的数量
top - 20:25:59 up 38 days, 12:34,2 users,load average: 0.04, 0.11, 0.13
Tasks: 197 total,1 running, 192 sleeping,4 stopped,0 zombie
%Cpu0:2.0 us,0.3 sy,0.0 ni, 97.7 id,0.0 wa,0.0 hi,0.0 si,0.0 st
%Cpu1:1.7 us,0.3 sy,0.0 ni, 98.0 id,0.0 wa,0.0 hi,0.0 si,0.0 st
%Cpu2:1.0 us,0.3 sy,0.0 ni, 98.7 id,0.0 wa,0.0 hi,0.0 si,0.0 st
%Cpu3:2.0 us,0.7 sy,0.0 ni, 97.3 id,0.0 wa,0.0 hi,0.0 si,0.0 st
KiB Mem : 16266636 total,1208312 free,5560320 used,9498004 buff/cache
KiB Swap:8388604 total,8388604 free,0 used.9973728 avail Memnginx配置CPU亲和：
[root@zq]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes4;
#与cpu数一致##方法1，当CPU核心数多时，就不好些了，建议采用方法2
#worker_cpu_affinity 0001 0010 0100 1000;
#cpu数4个，所以4位，1在第几位表示使用第几个cpu核心##方法2
worker_cpu_affinity auto;
error_log/var/log/nginx/error.log warn;
pid/var/run/nginx.pid;
#worker_rlimit_nofile 65535;
#nginx进程文件句柄限制events {
worker_connections1024;
}样例：
nginx未配置CPU亲和，查看nginx进程使用CPU情况：
[root@zq]# ps -eo pid,args,psr | grep nginx#psr指使用的哪一个cpu
9472 cat /var/log/nginx/access.l2
9483 tail -f /var/log/nginx/acce3
20824 grep --color=auto nginx1
27638 nginx: worker process0
27639 nginx: worker process0
27640 nginx: worker process3
27641 nginx: worker process3
30316 nginx: master process /usr/1
修改nginx.conf，增加worker_cpu_affinity 0001 0010 0100 1000; ，重加载nginx载查看nginx进程均匀的使用4个CPU核心：
[root@zq]# vi /etc/nginx/nginx.conf
[root@zq]# nginx -s reload -c /etc/nginx/nginx.conf
nginx: [warn] conflicting server name "127.0.0.1" on 0.0.0.0:443, ignored
nginx: [warn] conflicting server name "127.0.0.1" on 0.0.0.0:443, ignored
[root@zq]# ps -eo pid,args,psr | grep nginx
9472 cat /var/log/nginx/access.l2
9483 tail -f /var/log/nginx/acce3
21080 nginx: worker process0
21081 nginx: worker process1
21082 nginx: worker process2
21083 nginx: worker process3
21090 grep --color=auto nginx1
30316 nginx: master process /usr/0
