Original address https://blog.csdn.net/kittyboy0001/article/details/38562515
Original address https://blog.csdn.net/u010503912/article/details/51518705
adb shell top
The top command provides real-time monitoring of the system's processor status. It will display a list of the most CPU-sensitive tasks in the system. The command can sort tasks by CPU usage, memory usage, and execution time.
top usage
>adb shell top -h
Usage: top [ -m max_procs ] [ -n iterations ] [ -d delay ] [ -s sort_column ] [-t ] [ -h ]
-m num Maximum number of processes to display. 最多显示多少个进程
-n num Updates to show before exiting. 刷新次数
-d num Seconds to wait between updates. 刷新间隔时间（默认5秒）
-s col Column to sort by (cpu,vss,rss,thr). 按哪列排序
-t Show threads instead of processes. 显示线程信息而不是进程
-h Display this help screen. 显示帮助文档
adb shell top
> adb shell top
User 13%, System 5%, IOW 0%, IRQ 0%
User 85 + Nice 0 + Sys 37 + Idle 509 + IOW 0 + IRQ 0 + SIRQ 0 = 631
PID PR CPU% S #THR VSS RSS PCY UID Name
22205 0 13% S 56 423416K 88160K fg u0_a92 com.tmall.wireless
24310 1 2% R 1 1232K 536K root top
22600 0 1% S 46 341712K 40872K fg u0_a90 com.wandoujia.phoenix2.usbproxy
31125 1 1% S 31 319976K 33284K fg u0_a74 com.android.Chinpower
1533 0 1% S 32 67320K 20552K fg system /system/bin/surfaceflinger
1852 0 1% S 112 445876K 80304K fg system system_server
...
10 0 0% S 1 0K 0K root watchdog/0
16 1 0% S 1 0K 0K root khelper
22 1 0% S 1 0K 0K root suspend_sys_syn
23 1 0% S 1 0K 0K root suspend
The meaning of the first set of data:
User 处于用户态的运行时间，不包含优先值为负进程
Nice 优先值为负的进程所占用的CPU时间
Sys 处于核心态的运行时间
Idle 除IO等待时间以外的其它等待时间
IOW IO等待时间
IRQ 硬中断时间
SIRQ 软中断时间
The meaning of the second set of data:
PID 进程id
PR 优先级
CPU% 当前瞬时CPU占用率
S 进程状态:D=不可中断的睡眠状态, R=运行, S=睡眠, T=跟踪/停止, Z=僵尸进程
#THR 程序当前所用的线程数
VSS Virtual Set Size 虚拟耗用内存（包含共享库占用的内存）
RSS Resident Set Size 实际使用物理内存（包含共享库占用的内存）
PCY 调度策略优先级，SP_BACKGROUND/SP_FOREGROUND
UID 进程所有者的用户id
Name 进程的名称
Specific information can be found in the source code: xx\system\core\toolbox\top.c
Command usage of monitoring CPU
>adb shell top | findstr tmall > d:\cpu.txt
Print the top command and find the command line containing tmall, output to d:\cpu.txt
result:
22137 1 0% S 10 304728K 28900K bg u0_a92 com.tmall.wireless:push 22205 0 0% S 15 322944K 38236K bg u0_a92 com.tmall.wireless 22205 1 27% R 34 345304K 49396K fg u0_a92 com.tmall.wireless 22112 1 0% S 9 303704K 29380K bg u0_a92 com.tmall.wireless:containerprocess1 22137 1 0% S 10 304728K 28900K bg u0_a92 com.tmall.wireless:push 22252 1 0% S 9 302600K 28596K fg u0_a92 com.tmall.wireless:notify 22205 0 45% R 40 365500K 56708K fg u0_a92 com.tmall.wireless 22252 0 22% S 19 325476K 40868K bg u0_a92 com.tmall.wireless:notify 22137 0 2% S 14 308944K 31320K fg u0_a92 com.tmall.wireless:push 22112 0 0% S 9 305892K 29888K bg u0_a92 com.tmall.wireless:containerprocess1 22137 1 14% S 17 323080K 39696K bg u0_a92 com.tmall.wireless:push 22252 0 3% S 21 327656K 41556K bg u0_a92 com.tmall.wireless:notify 22205 1 2% S 38 366420K 59700K fg u0_a92 com.tmall.wireless 22112 0 0% S 9 305892K 29888K bg u0_a92 com.tmall.wireless:containerprocess1 22408 0 0% R 9 278424K 21936K fg u0_a92 com.tmall.wireless:utremote 22408 1 7% S 9 304180K 30964K bg u0_a92 com.tmall.wireless:utremote 22205 0 2% R 39 367456K 59612K fg u0_a92 com.tmall.wireless
======================================================================================================
android debugging top command to view system resources
Recently, when the application software developed by the customer was running on our customized android device (customized OS), the problem of black screen restart occurred. Before determining the problem, we need to reproduce the bug phenomenon reported by the customer. Due to the lack of understanding of the customer's software functions and other information at the beginning, it is difficult to reproduce the bug phenomenon during the test. When testing the printing function of the printer, it is accidentally found that the continuous printing of the printer will easily cause excessive CPU resource consumption. , and even cause the system to restart (the software does not respond, and the watchdog restarts the system after 5s). In order to effectively eliminate the problem of CPU resource consumption, the top command has been studied. This article will not talk about the use of various parameters of the top command, but select some of the more practical parameters to talk about some debugging skills.
Enter top -h in the ubuntu system to see how top is used.
omj@pc-ubuntu:~$top -h
procps-ng version 3.3.9
Usage:
top -hv | -bcHiOSs -d secs -n max -u|U user -p pid(s) -o field -w [cols]
Here we mainly talk about the use of the top command under the android system, so first connect the PC and the device with a usb cable, and then enter the shell of the android device to view the related usage of the top command.
Check if the android device is recognized by the PC:
omj@pc-ubuntu:~$adb devices
List of devices attached
d111a8ac device
Enter the shell of the android device:
omj@pc-ubuntu:~$adb shell
root@msm8610:/ #
See the help menu for the top command:
root@msm8610:/ #top -h
As can be seen from the help menu, the top command of the PC-level system is slightly different from that of the android device.
The top command to view process resources:
root@msm8610:/ #top
Update the display every 3s:
root@msm8610:/ #top -d 3
List of 5 processes by cpu size:
root@msm8610:/ #top -m 5
Use the grep command to filter and output the information of the "com.hcb.parking" process according to the name of the process (in the figure, the information is actually output every 1s):
root@msm8610:/ #top -d 1 | grep "com.hcb.parking"
Check the CPU and other information of all threads in the "com.hcb.parking" application (or "com.hcb.parking" process):
root@msm8610:/ #top -d 1 -t | grep "com.hcb.parking"
Save the CPU information of the "com.hcb.parking" process to a file every 3s:
root@msm8610:/ #top -d 3 | grep "com.hcb.parking" > /data/topinfo.txt &
Copy the topinfo.txt log information saved in the previous step from the android device (this command is executed after exiting the adb shell):
omj@pc-ubuntu:~/work$ adb pull /data/topinfo.txt .