问题描述
我正在制作一个小的Android应用程序以显示当前的总CPU使用率，例如Windows Task Manager中的Performance选项卡.我使用"top -m 1 -n 1 -d 1"来获取CPU使用率，但我不太了解"top"的结果.
I'm making a small Android application to show current total CPU usage like tab Performance in Windows Task Manager.I use "top -m 1 -n 1 -d 1" to get CPU usage, but i do not really understand the result of "top".
结果如下:
User 5%, system 15%, IOW 0%, IRQ 0%
User 5 + Nice 0 + Sys 14 + Idle 73 + IOW 0 + IRQ 0 + SIRQ 0 = 92
PID CPU% S #THR VSS RSS UID Name
213 11% R 1 900K 340K app_16 top
CPU使用率= ???如何计算CPU总使用率?
CPU usage = ???How can i calculated total CPU usage?
推荐答案
该问题的可接受答案不正确.输出的第二行是在该分组中启动的线程/进程的数量.上面的CPU使用率是20％.其中5％来自用户应用，而15％来自系统应用.您有73个空闲线程，14个系统线程和5个用户线程(根据第二行).
The accepted answer for this question is incorrect. The second line of the output is the number of threads/processes that are launched in that grouping. Your CPU usage is 20% in the above. 5% of that is from user apps and 15% from system apps. You have 73 idle threads, 14 system threads, and 5 user threads (according to the second line).
例如，这是Droid的当前顶部快照.
for instance, here is a current top snapshot for my Droid.
User 6%, System 5%, IOW 0%, IRQ 0%
User 21 + Nice 0 + Sys 16 + Idle 270 + IOW 0 + IRQ 3 + SIRQ 0 = 310
PID CPU% S #THR VSS RSS PCY UID Name
30994 4% S 19 134912K 24140K bg app_24 edu.vu.isis.ammo.spotreport
1021 3% S 57 217400K 58504K fg system system_server
20911 2% R 1 880K 400K fg shell top
1053 0% S 1 0K 0K fg root tiwlan_wq
995 0% S 2 1272K 128K fg compass /system/bin/akmd2
根据接受的答案，当这实际上只是线程数时，我将拥有310％的CPU使用率.我可以肯定我实际上只使用11％的CPU，而前3个进程使用的是总CPU的9％.
According to the accepted answer, I would have 310% CPU usage, when this is actually just the number of threads. I am pretty sure I am actually using only 11% of the CPU, where the top 3 processes are using 9% of that total.
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