I am writing my bachelor thesis and using this adb command to get framerate. In my experience, the framerate data is updated only when the screen is changed. For example, you have a long list. If you don’t scroll it, you only see limited framerate data, but if you scroll it, there will be more framerate data (but the maximum number of frames is 122 )

I want to measure the FPS of my Android Augmented Reality app. I am trying to follow the documentation for using dumpsys framestats.

This is my procedure:

1. connect device (Galaxy Tab S5e) via USB to computer (MacBook Pro)
2. Launch application
3. Open terminal and enter adb shell dumpsys gfxinfo <PACKAGE_NAME> framestats

I get results. The documentation says that I should get some CSV data (which I do). Here it is:

Flags,IntendedVsync,Vsync,OldestInputEvent,NewestInputEvent,HandleInputStart,AnimationStart,PerformTraversalsStart,DrawStart,SyncQueued,SyncStart,IssueDrawCommandsStart,SwapBuffers,FrameCompleted,DequeueBufferDuration,QueueBufferDuration,
1,270900288236110,270901404902732,9223372036854775807,0,270901406732543,270901407052751,270901407062751,270901480932022,270901488003689,270901488511137,270901489180876,270901502575459,270901504554157,1520000,1026000,
1,270901416955482,270901500288812,9223372036854775807,0,270901507061241,270901507131709,270901507732074,270901524054574,270901524125251,270901524430720,270901524804834,270901531068480,270901534144522,3249000,1831000,

Firstly, why is there only two rows, if:

“Each line of this output represents a frame produced by the app”

If I wait and then rerun the command, I again only get 2 rows. Sometimes the values have updated, but other times they have not…

The documentation says that I can calculate frame time with:

(FRAME_COMPLETED - INTENDED_VSYNC)

So, I thought I could run the ADB command after say, 1 minute, get out a load of frame times and then graph it, but if I only get out 2 frames at a time… and if rerunning the ADB command does not update the data… how can I measure Frametimes? What am I missing here?