commit 72ca85b0558fddb7b71751497b349a51b65c1500
author Sam Lin <samlin@google.com> Mon Nov 02 09:04:10 2020 -0800
committer Sam Lin <samlin@google.com> Tue Nov 03 15:51:07 2020 -0800
tree e5e437c247e763efcd6d3310cd3e5a0668a5e723
parent 45416de6b834063e26271552e50d118ae36a0a8b

Improve app startup time measurement

Bug: 171016031
Test: ./time_to_init_disp.sh
Change-Id: I8290b86a5edc55812f7f24a86d50db75a268237e

performance/time_to_init_disp.sh

diff --git a/performance/time_to_init_disp.sh b/performance/time_to_init_disp.sh
index 7e4d98f..2438853 100755
--- a/performance/time_to_init_disp.sh
+++ b/performance/time_to_init_disp.sh
@@ -20,12 +20,22 @@
 e.g.
 PKG_NAME="com.android.car.dialer" \
     ACT_NAME=".ui.TelecomActivity" \
-    LOOPS=10 \
+    LOOPS=3 \
+    SLEEP_SEC=3 \
     ./time_to_init_disp.sh
+
+Notes:
+  - This will not work on User builds.
 '
     exit
 }
 
+stop_pkg() {
+    echo "Force-stop $PKG_NAME"
+    adb shell am force-stop "$PKG_NAME"
+    sleep $SLEEP_SEC
+}
+
 if [[ -z $PKG_NAME ]]; then
     PKG_NAME="com.android.car.media"
 fi
@@ -36,25 +46,31 @@
 ACTIVITY="$PKG_NAME/$ACT_NAME"
 
 if [[ -z $LOOPS ]]; then
-    LOOPS=10
+    LOOPS=3
 fi
+
+if [[ -z $SLEEP_SEC ]]; then
+    SLEEP_SEC=3
+fi
+
 echo "Time $ACTIVITY to Initial Display for $LOOPS times."
+adb shell getprop ro.build.fingerprint
+stop_pkg
+
 START=1
 
-SLEEP_SEC=3
 adb root
 adb logcat -c
 for (( l=$START; l<=$LOOPS; l++ )); do
-    echo "Force-stop $PKG_NAME"
-    adb shell am force-stop "$PKG_NAME"
-    sleep $SLEEP_SEC
-
     echo "Dropping caches"
     adb shell "echo 3 > /proc/sys/vm/drop_caches"
 
     echo "Loop: $l"
-    adb shell am start -n "$ACTIVITY"
+    # -S: Force stop the target app before starting the activity.
+    # -W: Wait for launch to complete.
+    adb shell am start -S -W -n "$ACTIVITY"
     sleep $SLEEP_SEC
+    stop_pkg
 done
 
 echo