iostat 查看磁盘 I/O
[root@localhost ~]# iostat -d -x 2
extended device statistics
device mgr/s mgw/s r/s w/s kr/s kw/s size queue wait svc_t %b
hda 0 0 0.0 0.9 0.1 5.4 6.3 0.0 4.7 0.9 0
extended device statistics
device mgr/s mgw/s r/s w/s kr/s kw/s size queue wait svc_t %b
hda 0 3 0.0 2.0 0.0 20.0 10.0 0.0 0.8 0.5 0
......命令释意: 查看磁盘 I/0 情况，且每两秒刷新一次
[root@localhost ~]# vmstat 5
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 284 68700 165876 416748 0 0 0 5 1 1 0 0 100 0 0
......命令释意: 查看CPU使用情况的命令, 每 5 秒刷新一次，最右侧列为 CPU 的占用率的数据
top 查看进程占有率
[root@localhost ~]# top然后在 top 的命令内部命令栏输入shift+p or P
top - 13:38:52 up 102 days, 4:17, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 81 total, 2 running, 79 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1035292k total, 966592k used, 68700k free, 165876k buffers
Swap: 2096472k total, 284k used, 2096188k free, 416760k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4875 root 15 0 2192 1000 800 R 0.3 0.1 0:00.15 top
1 root 15 0 2060 620 532 S 0.0 0.1 0:01.65 init
2 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0
.......命令释意: 查看进程处理器占用率情况，并对其进行排序
free 查看内存使用情况
[root@localhost ~]# free
total used free shared buffers cached
Mem: 1035292 966592 68700 0 165876 416768
-/+ buffers/cache: 383948 651344
Swap: 2096472 284 2096188命令释意: 查看内存使用情况
top 查看进程内存使用
[root@localhost ~]# top然后在 top 的命令内部命令栏输入shift+m or M
top - 13:48:52 up 102 days, 4:27, 1 user, load average: 0.00, 0.01, 0.00
Tasks: 81 total, 2 running, 79 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1035292k total, 966592k used, 68700k free, 165876k buffers
Swap: 2096472k total, 284k used, 2096188k free, 416784k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4128 root 34 19 280m 266m 2112 S 0.0 26.4 1:48.40 yum-updatesd
8314 www 18 0 171m 34m 34m S 0.0 3.4 0:06.03 memcacheq
8280 www 15 0 88084 34m 588 S 0.0 3.4 0:01.23 memcached
10907 mysql 15 0 122m 16m 3892 S 0.0 1.7 0:25.29 mysqld
......命令释意: 查看进程内存占用率情况，并对其进行排序
获得针对某个 Interface 的网络流量
[root@localhost ~]# date;ifconfig eth0
Sun Mar 13 13:51:29 CST 2011
eth0 Link encap:Ethernet HWaddr 00:50:56:A4:0D:89
inet addr:172.10.7.215 Bcast:172.10.7.255 Mask:255.255.248.0
inet6 addr: fe80::250:56ff:fea4:d89/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:72113071 errors:12213 dropped:30790 overruns:0 frame:0
TX packets:1062902 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3311165612 (3.0 GiB) TX bytes:101244262 (96.5 MiB)
Interrupt:59 Base address:0x2000
[root@localhost ~]# date;ifconfig eth0
Sun Mar 13 13:53:13 CST 2011
eth0 Link encap:Ethernet HWaddr 00:50:56:A4:0D:89
inet addr:172.10.7.215 Bcast:172.10.7.255 Mask:255.255.248.0
inet6 addr: fe80::250:56ff:fea4:d89/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:72113528 errors:12213 dropped:30790 overruns:0 frame:0
TX packets:1062968 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3311204659 (3.0 GiB) TX bytes:101285190 (96.5 MiB)
Interrupt:59 Base address:0x2000命令释意: 通过比较两个时间网络接口的 RX 和 TX 数据来获得针对某个 Interface 的网络流量