ubuntu 11.10 察看系统资源情况

1，系统中自带的 系统监视器，图形化的界面，可以看到系统cpu，内存运作情况，

?不过，我看这系统监视器似乎太耗费资源了

2，top命令，发现这个才是最厉害的

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top - 23:22:02 up? 2:11,? 1 user,? load average: 0.03, 0.12, 0.13
Tasks: 165 total,?? 1 running, 164 sleeping,?? 0 stopped,?? 0 zombie
Cpu(s):? 6.6%us,? 1.2%sy,? 0.0%ni, 92.3%id,? 0.0%wa,? 0.0%hi,? 0.0%si,? 0.0%st
Mem:?? 1986204k total,? 1844388k used,?? 141816k free,?? 510956k buffers
Swap:?? 262136k total,???? 4444k used,?? 257692k free,?? 685504k cached

? PID USER????? PR? NI? VIRT? RES? SHR S %CPU %MEM??? TIME+? COMMAND???????????
?4175 administ? 20?? 0? 524m 135m? 40m S?? 12? 7.0?? 3:37.02 firefox???????????
?1628 administ? 20?? 0? 251m 107m? 32m S?? 11? 5.6?? 6:34.22 compiz????????????
?1061 root????? 20?? 0? 241m? 93m? 52m S??? 5? 4.8?? 6:30.44 Xorg??????????????
?4210 administ? 20?? 0? 191m? 39m? 15m S??? 3? 2.0?? 0:49.62 plugin-containe???
?1885 administ? 20?? 0 99352? 18m? 12m S??? 2? 1.0?? 0:17.98 gnome-terminal????
?1715 administ? 20?? 0? 109m? 24m? 11m S??? 1? 1.3?? 0:32.12 unity-panel-ser???
?? 45 root????? 20?? 0???? 0??? 0??? 0 S??? 0? 0.0?? 0:04.29 kworker/1:1???????
?1578 administ? 20?? 0? 6712 3060? 916 S??? 0? 0.2?? 0:39.41 dbus-daemon???????
?1612 administ? 20?? 0? 145m? 14m? 10m S??? 0? 0.7?? 0:05.44 gnome-settings-???
?1639 administ? 20?? 0? 3524? 772? 636 S??? 0? 0.0?? 0:04.11 syndaemon?????????
?6629 administ? 20?? 0? 2820 1168? 860 R??? 0? 0.1?? 0:06.20 top???????????????
?6803 administ? 20?? 0? 124m? 24m? 15m S??? 0? 1.2?? 0:28.85 stardict??????????
??? 1 root????? 20?? 0? 3328 1572 1144 S??? 0? 0.1?? 0:00.91 init??????????????
??? 2 root????? 20?? 0???? 0??? 0??? 0 S??? 0? 0.0?? 0:00.00 kthreadd??????????
??? 3 root????? 20?? 0???? 0??? 0??? 0 S??? 0? 0.0?? 0:03.42 ksoftirqd/0???????
??? 6 root????? RT?? 0???? 0??? 0??? 0 S??? 0? 0.0?? 0:00.00 migration/0???????
??? 7 root????? RT?? 0???? 0??? 0??? 0 S??? 0? 0.0?? 0:00.00 migration/1

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这是命令运行的结果：6.6%us代表当前用户CPU，1.2%sy是系统运行耗费CPU，92.3%id代表的空闲CPU，

当时看到内存1.9G占用了1.8G，看上去是这样，其实不是，内存并没有这么多。在系统监视器中就可以发现

下面的几行数，可以通过PID来kill进程 ,

如 kill 4175 可以杀死firefox,

? %CPU %MEM??? TIME+ ,CPU耗费，内存占用，CPU时间总和