This is a tool for processing atrace and summarizing how long user start, user switch and user unlock process takes during user switching
It also provides the time takes by top 5 slowest services in each category
To run the tool, enter the root directory for the Trebuchet project and use the following command template: ./gradlew :trebuchet:system-server-analyzer:run --args="<trace_file> [-u user_Id] [-o output_filename] [-c service_count]".
If you do not already have a trace file to analyze you can follow the steps below: (Assuming switching from user 10 to user 11)
1.switch to user 10 adb shell am switch-user 10 2.Capture 15 seconds of tracing information using atrace: adb shell atrace -o /sdcard/atrace-ss.txt -t 15 ss 3.In another console, switch to user 11: adb shell am switch-user 11 4.Pull the generate file: adb pull /sdcard/atrace-ss.txt
Alternatively, run-user-switch-perf.sh script in the scripts folder ./scripts/run-user-switch-perf.sh <from_user> <to_user> ./scripts/run-user-switch-perf.sh 10 11
Below is an example of its output:
Opening /tmp/atrace-ss.txt Progress: 100.00% Parsing atrace-ss.txt took 161ms StartUser-11 duration: 175.161 ms com.android.server.policy.PermissionPolicyService 136.691 ms com.android.server.role.RoleManagerService 13.945 ms com.android.server.voiceinteraction.VoiceInteractionManagerService 10.931 ms com.android.server.locksettings.LockSettingsService$Lifecycle 2.052 ms com.android.server.devicepolicy.DevicePolicyManagerService$Lifecycle 1.231 ms SwitchUser-11 duration: 276.585 ms com.android.server.om.OverlayManagerService 253.871 ms com.android.server.inputmethod.InputMethodManagerService$Lifecycle 10.970 ms com.android.server.usb.UsbService$Lifecycle 1.021 ms com.android.server.media.MediaSessionService 0.522 ms com.android.server.media.projection.MediaProjectionManagerService 0.493 ms UnlockUser-11 duration: 72.586 ms com.android.server.autofill.AutofillManagerService 28.399 ms com.android.server.voiceinteraction.VoiceInteractionManagerService 16.270 ms com.android.server.accounts.AccountManagerService$Lifecycle 6.775 ms com.android.server.StorageManagerService$Lifecycle 4.069 ms com.android.internal.car.CarServiceHelperService 1.290 ms