GreenDroid is a tool that analyzes power consumption in Android applications. It works by instrumenting app source code and tests to collect execution traces and measure power usage. GreenDroid uses a power consumption model that assigns estimated power levels to different hardware component states. It analyzes traced methods to detect potential power issues and provides visualizations of power usage over time. The goal of GreenDroid is to help optimize apps to reduce energy consumption.

1. GreenDroid:A Tool for Analysing Power
Consumption in the Android Ecosystem
Marco Couto*¶, Jácome Cunha*§, João Paulo Fernandes‡,
Rui Pereira*¶, and João Saraiva*¶
1
Informatics ‘ 2016 – Poprad greenlab.di.uminho.pt
* HASLab/INESC ¶ Universidade do Minho, Portugal
‡ RELEASE, Universidade da Beira Interior, Portugal
§ Universidade Nova de Lisboa, Portugal
{mcouto, ruipereira, jas}@di.uminho.pt, jacome@fct.unl.pt, jpf@di.ubi.pt

2. Going Green
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+ =

3. Green Computing
 Caught the attention of many companies allowing them to save:
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“close to 50% of the energy costs of an organization can be
attributed to the IT departments”
- [Harmon and Auseklis, 2009]
“up to 90% of energy used by ICT hardware can be attributed to
software”
- [Standard, 2013]

4. Green Software
 Reducing energy consumption through software analysis and optimization
 Problem:
 How to analyze
 How to interpret
 How to improve
 In mobile devices, the interest is quite large
 Battery lifetime is critical!
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5. GreenDroid
 Power consumption model oriented
 Consumption per execution and program trace
 Predicts possible power-expensive methods
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6. GreenDroid: Basic Workflow 6
Source
Code
Tests
Instrument
Source
Code
I
Tests
I
Build
APP
Tests
. Execution Trace
. Consumption
. Execution Time
*For each
Analyzer
Power Consumption
Model
Build
Informatics ‘ 2016 – Poprad greenlab.di.uminho.pt

7. Power Consumption Model – Power Tutor
 Hardware components have states
 e.g., CPU has different percentages of usage
 Each state implies different consumptions
 Idea: assign consumption to each component state
 When monitoring consumption:
 Check the components’ states;
 Determine consumption using the power model
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8. The Model as an API
 Power Tutor is an Android application
 Problem: cannot be invoked in other applications
 Solution: transform the model into an API
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1. traceMethod()
2. config()
3. start()
4. stop()
Program trace
Initializes Power Consumption Model
Starts the power monitoring thread
Stops the power monitoring thread

9. Instrumentation: Source Code
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Source
Code
public class C1{
...
public void m1(){
Estimator.traceMethod(“m1”, “C1”);
...
}
...
}
public class C1{
...
public void m1(){
...
}
...
}

10. Instrumentation: Tests
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Tests
public class TestSuite1{
...
public void setUp(){
...
}
public void tearDown(){
...
}
...
...
}
public class TestSuite1{
...
public void setUp(){
Estimator.config(“package”,
_______android.os.Process.myUid(),
this.getContext());
Estimator.start();
...
}
public void tearDown(){
Estimator.stop()
...
}
...
...
}

11. Result Analysis
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12. Power Consumption Graphics
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13. Power Consumption Graphics
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14. Power Consumption Graphics
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 Method classifications and analysis
technique based on prior research
 “Detecting Anomalous Energy
Consumption in Android
Applications” – SBLP’2014

15. Conclusions
 GreenDroid Tool
 Analyze power consumption of Android apps
 Detect possible power leaks
 Plan to extend GreenDroid approach to analyze other applications
 Download at: https://github.com/greensoftwarelab/GreenDroid
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16. GreenDroid:A Tool for Analysing Power
Consumption in the Android Ecosystem
Marco Couto*¶, Jácome Cunha*§, João Paulo Fernandes‡,
Rui Pereira*¶, and João Saraiva*¶
16
Informatics ‘ 2016 – Poprad greenlab.di.uminho.pt
* HASLab/INESC ¶ Universidade do Minho, Portugal
‡ RELEASE, Universidade da Beira Interior, Portugal
§ Universidade Nova de Lisboa, Portugal
{mcouto, ruipereira, jas}@di.uminho.pt, jacome@fct.unl.pt, jpf@di.ubi.pt