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系统平均负载被定义为在特定时间间隔内运行队列中的平均进程数量。

load average: 0.17, 0.44, 0.24　　　　在过去的1、5、15分钟内运行队列中的平均进程数量

Cpu(s):  0.4%us,  0.4%sy,  0.0%ni, 97.5%id,  1.1%wa,  0.4%hi,  0.4%si,  0.0%st

1.用户空间占用CPU的百分比  

2.内核空间占用CPU的百分比  

3.改变过优先级的进程占用CPU的百分比

4.空闲CPU百分比

5.IO等待占用CPU的百分比

6.硬中断（Hardware IRQ）占用CPU的百分比

7.软中断（Software Interrupts）占用CPU的百分比

PR:　

　　The priority of the task.

NI:　

　　The nice value of the task. A negative nice value means higher priority, whereas a positive nice value means
lower priority. Zero in this field simply means priority will not be adjusted in determining a task’s dis-
patchability.

VIRT: kb

　　The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus
pages that have been swapped out. (Note: you can define the STATSIZE=1 environment variable and the VIRT will
be calculated from the /proc/#/state VmSize field.)

RES: kb

　　The non-swapped physical memory a task has used.

SHR: kb

　　The amount of shared memory used by a task. It simply reflects memory that could be potentially shared with
other processes.

%CPU:

　　The task’s share of the elapsed CPU time since the last screen update, expressed as a percentage of total CPU
time. In a true SMP environment, if ’Irix mode’ is Off, top will operate in ’Solaris mode’ where a task’s cpu
usage will be divided by the total number of CPUs. You toggle ’Irix/Solaris’ modes with the ’I’ interactive
command.

%MEM: (RES)

　　A task’s currently used share of available physical memory.

TIME+: CPU Time, hundredths

　　The same as ’TIME’, but reflecting more granularity through hundredths of a second.

COMMAND:

　　Command line or Program name.

相似命令： uptime, w , tload

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原文地址：http://www.cnblogs.com/foreverstars/p/4776428.html