pidstat 命令查看nginx上下文切换

pidstat -w -p 711 1

[root@leilei ~]# ps -ef|grep nginx
root     13974     1  0 14:23 ?        00:00:00 nginx: master process nginx
www      13975 13974  0 14:23 ?        00:00:00 nginx: worker process
www      13976 13974  0 14:23 ?        00:00:00 nginx: worker process
www      13977 13974  0 14:23 ?        00:00:00 nginx: cache manager process
root     18769  9104  0 14:49 pts/0    00:00:00 grep --color=auto nginx

[root@leilei ~]# pidstat -w -p 13975 1
Linux 3.10.0-693.el7.x86_64 (leilei) 	04/28/2020 	_x86_64_	(2 CPU)

02:49:27 PM   UID       PID   cswch/s nvcswch/s  Command
02:49:28 PM  1000     13975      0.00      0.00  nginx
02:49:29 PM  1000     13975      0.00      0.00  nginx
02:49:30 PM  1000     13975      0.00      0.00  nginx
02:49:31 PM  1000     13975      0.00      0.00  nginx
02:49:32 PM  1000     13975      0.00      0.00  nginx
02:49:33 PM  1000     13975      0.00      0.00  nginx

如果 cswch/s 较为均匀,说明切换正常