manafa 0.2.4

E-MANAFA: Energy Monitor and ANAlyzer For Android

E-MANAFA: Energy Monitor and ANAlyzer For Android

E-MANAFA is a software model-based tool for performing fine-grained estimates of energy consumption on Android devices. For this purpose, it uses values from power_profile.xml and from the BatteryStats and Perfetto services to estimate the energy consumption of each resource / component of the device.

SETUP

In order to run this tool, the following resources are required:

• A rooted Android device (running Android 9 or above);
• A *nix-based environment (MAC OS , Linux);
• Python 3.6 or above;
• Android Sdk tools (https://developer.android.com/studio/releases/platform-tools)

Installation

pip install manafa

define environment variables

In order to run this tool, there are at least 2 env. variables that need to be defined in the shell startup script (e.g .bashrc or .bash_profile file)

export ANDROID_HOME=$HOME/<your-android-instalation-folder>/ 
export PATH=$ANDROID_HOME/platform-tools:$PATH

Replicate the environment

Install virtual virtualenv enviroment (via python-pip):

$ python -m pip install --user virtualenv

Replicate locally the dev virtualenv

$ virtualenv env/

Activate the virtual environment

$ source env/bin/activate

Extract power_profile.xml file from device (https://source.android.com/devices/tech/power/values)

Note: This file present in every device since Android 5 should contain values that were estimated by device manufacturers using external apparatus. However, most devices don't provide a fine-grained power profile. Google provides a set of instructions in order to complete this file with more accurate values(https://source.android.com/devices/tech/power/component).

TODO

Install required packages

$ pip install -r requirements.txt

Examples

# getting the energy consumed during a profiling session (between first and last measurement)
g = GreenStats(power_profile=DEFAULT_PROFILE, timezone="EST")
g.init()
g.start()
do_some_work()
batstats_out_file, perfetto_out_file = g.stop()
g.parseResults( DEFAULT_PROFILE, batstats_out_file , perfetto_out_file )
begin = g.bat_events.events[0].time
end = g.bat_events.events[-1].time
consumption,per_component_consumption = g.getConsumptionInBetween(begin, end)
print("Energy consumed: %f Joules" % consumption)

Supported devices:

This tool can be used with any Android device able to run Perfetto, that is available since Android 9 (P). The tool so far was successfuly executed on the following devices:

• Pixel 3a
• Pixel 4a 5G
• Xiaomi Mi 9 Lite

TODO

• calibrate the model
• test using flashlight
• wifi pixel4a