The document discusses measuring and visualizing energy consumption within software code. It proposes instrumenting source code to collect metrics on energy usage during execution. A spectrum-based fault localization technique would be adapted to identify energy leaks by analyzing the metrics collected from different tests. The information would then be represented and presented to developers to help them optimize energy efficiency during the development process.

1. Measuring and Visualizing Energy
Consumption within Software
Code
Tiago Carção
University of Minho, Braga, Portugal
Supervisors:
João Saraiva
Jácome Cunha
Graduate Consortium - VL/HCC 2014

2. Do the developers concern
themselves with energy consumption
during the development process?
How can we display that information
to the developers?
What type of information should be
presented to the developers?

3. Why Energy?
1

4. Why software?
2

5. Isolation
Responsibility
Identification and improvement
Quantification
What type of information do developers have?
3

6. Spectrum-based Fault Localization
4

7. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
1
1
0
0
1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0 1 0 1
Spectrum-based Fault Localization
4
Does the test output matches the expected output?

8. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
0
0
1 1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0.3
1 0 1 0 1
Spectrum-based Fault Localization
4

9. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
0
0
1 1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0.7
0.3
0.3
0.3
1 0 1 0 1
Spectrum-based Fault Localization
4

10. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
0
0
1 1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0.3
0.7
0.3
0.3
0.3
0.7
1 0 1 0 1
Enquire
possible
faults!
Spectrum-based Fault Localization
4

11. How to adapt the SFL model for Energy Leak detection?
What data to collect from the code execution?
Decide what is a energy leak?
5

12. int first = 0, second = 1, next, c;
for ( c = 0 ; c < number; c++ ) {
if ( c <= 1 )
next = number;
else {
next = first + second;
first = second;
second = next;
}
}
int fibonacciCalc(int number) {
return next;
}
Source code instrumentation
6

13. #GET TIME & START MEASURING
int first = 0, second = 1, next, c;
for ( c = 0 ; c < number; c++ ) {
if ( c <= 1 )
next = number;
else {
next = first + second;
first = second;
second = next;
}
}
int fibonacciCalc(int number) {
return next;
}
#GET TIME & END MEASURING
Source code instrumentation
6

14. Metrics collected
7

15. SFL Adapted
Tests
t1 t2 t3 t4 t5
8

16. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
0
0
1 1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0.8 0.3 0.9 0.3 0.7
SFL Adapted
8

17. Tests
t1 t2 t3 t4 t5
1
1
1
1
1
1
1
1
0
0
1 1
1 1 1
1 1 1
1 1 1
1 0 1
1 0 1
1 1 1
0.1
0.2
0.11
0.23
0.8
0.46
0.8 0.3 0.9 0.3 0.7
SFL Adapted
8

18. How to represent the information?
9

19. What we envision
10

20. Do the developers concern
themselves with energy consumption
during the development process?
How can we display that information
to the developers?
What type of information should be
presented to the developers?

21. Measuring and Visualizing Energy
Consumption within Software
Code
Tiago Carção
University of Minho, Braga, Portugal
Supervisors:
João Saraiva
Jácome Cunha
Graduate Consortium - VL/HCC 2014