Exercise Day 01

Android System Programming Course Day 1 Exercises 1-3 are demonstrative and no output is expected. Exercises 4-6 should be done in separate directories. Directory names should be “example4” ... “example6”.

Exercise1 This exercise is created to show steps needed to successfully build and run Android. In this case, we will build for MIPS architecture, using QEMU. 1. Untar archive called “android-source.tar” from scratch to your working directory a. This archive containes the source code for thee Android 2.2 version (Froyo) 2. Copy script called “v8-mips-sim-env.sh” “v8-mips-sim -env.sh” to your android-source directory a. This script contains necessary variables needed to build Android, for QEMU, for MIPS architecture 3. Source script a. Exports necessary variables for the build 4. Run make –j6 a. This will do do the actual build of the Android b. Don’t go beyond –j6. This will give you the best build time for your computers 5. After make finishes (after ~20 minutes) run Android emulator using command: “emulator –shell” First build will take a while to finish. Every next consecutive build will finish much faster, depending on the severity of changes you make. Examine sourced script.

Android System Programming Course Day 1 Exercise 2 This exercise will show one of the ways how to install applications on your Android system. 1. Run Android QEMU with command “emulator -shell” 2. Open new console and source “v8-mips-sim-env.sh” script 3. Run “adb devices” in new console 4. Run “adb install cm3.apk” in new console 5. In the emulator, go to Applications 6. Verify that CaffeineMark3.0 is installed You can install application in this way for any Android device, not just QEMU. Android debug bridge must be working for this to work.

Exercise 3 This exercise will show yet another way how to install applications on your Android system. 1. Source “v8-mips-sim-env.sh” script 2. Build Android 3. Go to ./out/target/product/ generic /system/app 4. Copy “cm3.apk” to that directory 5. Go to the root of your android source and run “make snod” 6. Start Android and verify that CaffeineMark3.0 is installed You can install application in this way for any Android device, not just QEMU. For your build, change product path from generic  to value that matches your platform ID.

Android System Programming Course Day 1 Exercise 4 This exercise will show you how to enable/disable JIT mode for the Dalvik VM. Effects will be shown on the previously installed CaffeineMark3.0 benchmark application. The CaffeineMark is a series of tests that measure the speed of Java programs running in various hardware and software configurations. CaffeineMark scores roughly correlate with the number of Java instructions executed per second, and do not depend significantly on the the amount of memory in the system or on the speed of a computers disk drives or internet connection. 1. Star Android using this command “emulator –shell -prop dalvik.vm.executionmode=int:MODE”, where MODE is one of the following: a. portable b. fast c. jit 2. Star Android for all modes, and run CaffeineMark3.0 application. 3. Log benchmark results obtained for all modes, and discuss. Lower results are expected for the interpreter mode (portable and fast), while best performance is expected for the JIT mode (Just-In-Time).

Exercise 5 1. Examine “v8-mips-sim-env.sh” script and evaluate what is needed to be changed to build for ARM QEMU 2. Make new script, called “v8-arm-sim-env.sh” 3. Source “v8-arm-sim-env.sh” 4. Build Android, and run QEMU

Android System Programming Course Day 1 Exercise 6 1. Repeat Exercise 4, but for ARM architecture 2. Log benchmark results for all modes 3. Compare results with results obtained for MIPS build 4. Comment When running Dalvik in JIT mode for ARM, examine “dalvik/vm/Android.mk file”