CPU/System Load Average这些参数可以帮助我们了解系统的运行情况，那么在Ubuntu如何查看CPU/System Load Average呢？
有很多方法可以得到这些参数信息：
1.uptime
The uptime command gives information on system load averages for the past 1, 5, and 15 minutes:
[root@ubuntu 5laida]# uptime
11:25:29 up 4 days, 11:56, 15 users, load average: 0.00, 0.00, 0.00
2.w
The w command shows who is logged on and what they are doing, including system load averages for the past 1, 5, and 15 minutes.
[root@ubuntu 5laida]# w
11:26:51 up 400 days, 11:58, 1 users, load average: 0.00, 0.00, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
5laida pts/0 192.168.1.115 11:11 0.00s 0.00s 0.00s /usr/sbin/sshd
3./proc/loadavg
The /proc/loadavg file contains information on the system load. Most likely the uptime/w commands utilize this information. The first 3 values contain system load averages for the past 1, 5, and 15 minutes.
[root@ubuntu 5laida]# cat /proc/loadavg
0.00 0.00 0.39 1/49 15352
还有其他的一些方法来得到这些参数信息，不过这些是最常用的。
