原文：http://blog.****.net/zhangfn2011/article/details/7488746
TOP中只查看某个或某些进程的信息
top中使用CPU或MEM排序，还是看不到我们想了解的进程的相关信息；
这时就可以指定对某个或某些进程进行TOP信息显示；
1、查看某个进程的信息
例：mysqld的信息
(1)得到mysqld进程的pid
[root@6 ~]# pidof mysqld
21538
(2)top指定查看PID
[root@6 ~]# top -p 21538
top - 09:15:06 up 30 days, 53 min, 3 users, load average: 0.07, 0.22, 0.23
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.0%us, 6.9%sy, 0.2%ni, 89.4%id, 0.3%wa, 0.1%hi, 0.1%si, 0.0%st
Mem: 1035140k total, 994888k used, 40252k free, 383072k buffers
Swap: 2048248k total, 80k used, 2048168k free, 237456k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21538 mysql 15 0 146m 21m 4372 S 0.0 2.1 3:03.84 mysqld
2、查看某些进程的信息
例：mysqld/httpd的信息
(1)得到mysqld/httpd进程的pid
[root@6 ~]# pidof mysqld
21538
[root@6 ~]# pidof httpd
31117 31116 31115 31114
(2)top指定查看PID
[root@6 ~]# top -p 21538,31117,31116,31115,31114
top - 09:20:05 up 30 days, 58 min, 3 users, load average: 0.37, 0.24, 0.23
Tasks: 5 total, 0 running, 5 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.0%us, 6.9%sy, 0.2%ni, 89.4%id, 0.3%wa, 0.1%hi, 0.1%si, 0.0%st
Mem: 1035140k total, 994364k used, 40776k free, 383404k buffers
Swap: 2048248k total, 80k used, 2048168k free, 237560k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21538 mysql 15 0 146m 21m 4372 S 0.0 2.1 3:03.86 mysqld
31117 apache 15 0 60036 8428 4668 S 0.0 0.8 0:00.48 httpd
31116 apache 15 0 60308 9.9m 6288 S 0.0 1.0 0:00.48 httpd
31115 apache 15 0 60100 8552 4756 S 0.0 0.8 0:00.48 httpd
31114 apache 15 0 59892 6452 3060 S 0.0 0.6 0:00.41 httpd