03-20 Special test-APP startup performance analysis

Activity start process

• Application OnCreate

  • Load third-party sdk

• Activity OnCreate

  • Load its own logic
  • Send remote data request
  • Rendering interface

APP startup performance indicators

1. Cold start: the most important start indicator, focusing on optimization, the recommended time is 5 seconds
2. Warm start: recommended time 2 seconds
3. Hot start: recommended time 1.5 seconds
4. First screen launch

The main process of the test

1. adb logcat: not accurate enough
2. Screen recording + video deframing: more accurate, requiring manual operation
3. Automated tools such as uiautomator for 200ms inspection interface change
4. traceview
5. Hard burying point: the most accurate, and the coverage is wider

adb logcat

• Clean up cached data: adb shell pm clear package
• Stop the process: adb shell am force-stop package
• Start the APP: adb shell am start -S -W package/activity
• Get data: adb logcat | grep -i displayed

Get the result through adb logcat:

• startTime: Record the time when startActivityAndWait() was just about to be called
• endTime: record the time point when the startActivityAndWait() function call returns
• waitTime: startActivityAndWait() call takes time; waitTime = endTime-startTime

Use ffmpeg to deframe

1. Clear application cache: adb shell am force-stop package
2. to the designated address of the phone: 16136e3cb1e540 adb shell screenrecord --bugreport --time-limit 30 Screen recording file path &
3. Start the APP and jump to the specified interface: adb shell am start -S -W package/activity
4. Pull the screen recording file from the mobile phone to the computer: adb pull The storage path of the screen recording file path
5. Convert video to gif format: ffmpeg -i screen recording file split format
6. Split the video into 10 frames per second and store it as a jpg format picture: ffmpeg -i screen recording file -r 10 frames_%03d.jpg
7. Then analyze the picture frame by frame to find the click time and the time to open the specified interface, so as to calculate the startup time