All about adb shell dumpsys

What is dumpsys?

This was the word always ticking my head whenever I use to talk to vendors. They always needed this one. So I started reading about it and how it benefited them to resolve the android related issues.
dumpsys : It is nothing but a tool which gives the status of services running on device.

Below is the command which shows the list of all services along with the package name

adb shell service list

Output will be as below

Fig 1 shell service list

So next question is how to identify the services. So below commands give you list of service

adb shell dumpsys -l

Output will be as below

Fig 2 dumpsys -l

There are many filters which you can use for analyzing the dumpsys data

1. dumpsys activity

It shows the list of activities running at that moment on device

adb shell dumpsys  activity

Fig 3 dumpsys activity

2. dumpsys batterystats

This generates the statistical data for battery usage on device.

adb shell dumpsys batterystats

Fig 4 dumpsys batterystats

3. dumpsys cpuinfo

This adb command display the CPU information utilized by device

adb shell dumpsys cpuinfo

Fig 5 dumpsys cpuinfo

Above output you can see that gaana app have utilized 17% of CPU as it was used last.

4. dumpsys wifi

This command displays the status of wifi

adb shell dumpsys wifi

Fig 6 dumpsys wifi

5. dumpsys meminfo

This command displays the memory information of the device

adb shell dumpsys meminfo

Fig 7 dumpsys meminfo

6. dumpsys procstats

This command displays the process stats

adb shell dumpsys procstats --hours 3

Fig 8 dumpsys procstats

For more on dumpsys refer to https://developer.android.com/studio/command-line/dumpsys