measure android app startup time

benchmark.sh

#!/bin/bash

# Simple bash script runs adb to measure startup time of android apps

trap ctrl_c INT

time=()

function ctrl_c() {
    total=0
    for i in "${time[@]}"; do
        total=$(($total + $i))
    done
    avg=$(expr $total / ${#time[@]})
    echo "Ran ${#time[@]} cold starts with an avg upstart time of ${avg} millis"
    exit 0
}

function run_adb() {
    adb shell am start -S -W $PKG_NAME/$ACTIVITY_PATH -c android.intent.category.LAUNCHER -a android.intent.action.MAIN
}

MAX_COUNT=64
COUNT=0
PKG_NAME=$1
ACTIVITY_PATH=$2

if [ -z $PKG_NAME ] || [ -z $ACTIVITY_PATH ]; then
    echo "usage: ./benchmark.sh tld.example.name package.path.to.activity"
    exit 1
fi

while [ $COUNT -le $MAX_COUNT ]; do
    value=$(run_adb | cut -d$'\n' -f6 | cut -d' ' -f2)
    time+=($value)
    let COUNT=COUNT+1
    echo "Test $COUNT took: $value ms"
done
ctrl_c