[MIUI with Tom #23] Optimize all APP for running it faster, smoother and with less battery power! - TechLab - Mi Community

Hi Dear MIUI Fan's!

Today i'll show you how to Optimize all APP for running it faster, smoother and with less battery power! I'm not Android developer but i try explain all with simple word for better understanding for normal user. If you are ready than i can start!))

Foreword

To this moment your device use ART JIT Compiler for running apps. ART JIT - is a Android Runtime Just in Time. This mean Android compile code every time for running app.

The JIT compiler complements ART's current ahead-of-time (AOT) compiler and improves runtime performance, saves storage space, and speeds application and system updates. It also improves upon the AOT compiler by avoiding system slowdown during automatic application updates or recompilation of applications during over-the-air (OTA) updates.

Although JIT and AOT use the same compiler with a similar set of optimizations, the generated code might not be identical.

But ART have profile compiler AOT (Ahead of Time) and he is not activate for app in android, but you can activate it from ADB SHELL.

Profile-guided compilation.

1.The user runs the app, which then triggers ART to load the .dex file.

If the .oat file (the AOT binary for the.dex file) is available, ART uses it directly. Although .oat files are generated regularly, they don't always contain compiled code (AOT binary).
If the .oat file does not contain compiled code, ART runs through JIT and the interpreter to execute the .dex file.

2. JIT is enabled for any application that is not compiled according to the speed compilation filter (which says "compile as much as you can from the app").

3. The JIT profile data is dumped to a file in a system directory that only the application can access.

4. The AOT compilation (dex2oat) daemon parses that file to drive its compilation.

And now let's look at the pros and cons:

Pros:

- Run APP faster

- Use less power

Cons:

- Applications install a little longer (but not very noticeably)

- Use more storage

!!!Warning!!!

This is not recomend to use on device with 16\32 GB storage

If briefly the following commands make it possible to compile the code into an offline profile (.aot file) to run applications.

Do not forget!! The more applications installed, the more space will be taken after a new compilation.

Here is a resoult

Tutorial

Download Platform-tools and run CMD from folder Platform-tool

Enable USB Debugging and USB debugging Secure Settings in Developer options your device.

To force compilation, run the following:

adb shell cmd package compile

Common use cases for force compiling a specific package:

My-Package is apk name from Settings

Example command

adb shell cmd package compile -m speed -f com.tencent.mobileqq

If command right and all ok, you will see Success word after command

For one APP:

adb shell cmd package compile -m speed -f my-package

Common use cases for force compiling all packages:

Full:

adb shell cmd package compile -m speed -f -a

Example i compile all APP

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Clearing profile data (revert all back)

To clear profile data and remove compiled code, run the following with ROOT: