Presentation @ Informatics 2015

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