top命令第一次迭代总是返回相同的结果 [英] top command first iteration always returns the same result
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问题描述
在运行前-b -n 1，该命令总是返回相同的CPU值。
请看下面的测试运行5次连续：
When running top -b -n 1, the command always returns the same CPU values. Consider the following test run 5 times in succession:
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 39.8%us, 27.7%sy, 0.0%ni, 31.3%id, 0.0%wa, 0.0%hi, 1.2%si, 0.0%st
Cpu(s): 39.0%us, 35.4%sy, 0.0%ni, 23.2%id, 0.0%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 41.2%us, 34.1%sy, 0.0%ni, 15.3%id, 1.2%wa, 0.0%hi, 2.4%si, 5.9%st
Cpu(s): 59.0%us, 30.1%sy, 0.0%ni, 4.8%id, 0.0%wa, 0.0%hi, 3.6%si, 2.4%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 18.9%us, 17.8%sy, 0.0%ni, 63.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 18.8%us, 21.2%sy, 0.0%ni, 55.3%id, 2.4%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 29.4%us, 24.7%sy, 0.0%ni, 45.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 60.5%us, 24.4%sy, 0.0%ni, 11.6%id, 1.2%wa, 0.0%hi, 1.2%si, 1.2%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 43.4%us, 38.6%sy, 0.0%ni, 15.7%id, 0.0%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 55.3%us, 40.0%sy, 0.0%ni, 4.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 39.5%us, 48.8%sy, 0.0%ni, 5.8%id, 1.2%wa, 0.0%hi, 1.2%si, 3.5%st
Cpu(s): 40.7%us, 55.6%sy, 0.0%ni, 2.5%id, 0.0%wa, 0.0%hi, 0.0%si, 1.2%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 27.1%us, 10.6%sy, 0.0%ni, 61.2%id, 1.2%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 25.3%us, 5.7%sy, 0.0%ni, 67.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.1%st
Cpu(s): 15.5%us, 16.7%sy, 0.0%ni, 64.3%id, 0.0%wa, 0.0%hi, 0.0%si, 3.6%st
Cpu(s): 57.3%us, 11.2%sy, 0.0%ni, 30.3%id, 0.0%wa, 0.0%hi, 0.0%si, 1.1%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 44.0%us, 6.0%sy, 0.0%ni, 42.9%id, 0.0%wa, 0.0%hi, 3.6%si, 3.6%st
Cpu(s): 45.8%us, 9.6%sy, 0.0%ni, 44.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 34.5%us, 8.3%sy, 0.0%ni, 57.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 38.6%us, 14.5%sy, 0.0%ni, 45.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.2%st
任何想法可能是这里的问题？
Any idea what could be the issue here?
推荐答案
CPU利用率数据是计算为平均值的时间间隔。对于第一次迭代，在该时间间隔是从系统启动到现在;对于随后的迭代，该时间间隔是从上一次迭代直至现在
CPU utilisation figures are calculated as an average over a time interval. For the first iteration, that time interval is "from system boot until now"; for subsequent iterations, the time interval is "from the last iteration until now".
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