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下面是sar 和top分别输出的数据.从sar输出的数据看 CPU空闲就基本为0
而top输出的数据,CPU空闲基本都很多
我查过一些资料,说是top其实和sar 读取的内容或者是算法不一样
top是通过查看/proc/PID/stat 的信息然后经过一些什么算法得出的
sar不知道
就是想知道一下这两个结果为什么会出现不一样的情况,哪个输出的数据更可靠一些？
[root@localhost]# sar -u 2 10
Linux 2.6.9-42.ELsmp (localhost) 03/27/2012
04:17:07 PM CPU %user %nice %system %iowait %idle
04:17:09 PM all 50.00 0.00 50.00 0.00 0.00
04:17:11 PM all 25.00 0.00 75.00 0.00 0.00
04:17:13 PM all 58.33 0.00 41.67 0.00 0.00
04:17:15 PM all 40.00 0.00 40.00 20.00 0.00
04:17:17 PM all 0.00 0.00 100.00 0.00 0.00
04:17:17 PM CPU %user %nice %system %iowait %idle
04:17:19 PM all 50.00 0.00 50.00 0.00 0.00
04:17:21 PM all 25.00 0.00 75.00 0.00 0.00
04:17:23 PM all 25.00 0.00 75.00 0.00 0.00
04:17:25 PM all 52.63 0.00 47.37 0.00 0.00
04:17:27 PM all 20.00 0.00 80.00 0.00 0.00
Average: all 51.22 0.00 48.17 0.61 0.00
top - 16:18:49 up 95 days, 1:41, 1 user, load average: 0.18, 0.20, 0.17
Tasks: 99 total, 1 running, 94 sleeping, 0 stopped, 4 zombie
Cpu0 : 12.3% us, 9.0% sy, 0.0% ni, 78.3% id, 0.0% wa, 0.3% hi, 0.0% si
Cpu1 : 0.0% us, 0.3% sy, 0.0% ni, 96.7% id, 3.0% wa, 0.0% hi, 0.0% si
Cpu2 : 0.3% us, 0.0% sy, 0.0% ni, 99.7% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu3 : 0.3% us, 0.3% sy, 0.0% ni, 99.3% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu4 : 4.7% us, 4.0% sy, 0.0% ni, 91.3% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu5 : 0.0% us, 0.0% sy, 0.0% ni, 100.0% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu6 : 0.0% us, 0.0% sy, 0.0% ni, 100.0% id, 0.0% wa, 0.0% hi, 0.0% si
Cpu7 : 0.0% us, 0.0% sy, 0.0% ni, 100.0% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 16632016k total, 16498404k used, 133612k free, 122260k buffers
Swap: 32764556k total, 144k used, 32764412k free, 12640360k cached |
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发表于 2012-03-27 16:23