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Master Thesis - Past Projects - Abstract
Measuring and Analysing Execution Time
Autoliv has developed the Night Vision system, which is a safety system for use in
cars to improve the driverís situational awareness during night conditions. It is a
real-time system that is able to detect pedestrians in the traffic environment and
issue warnings when there is a risk of collision. The timing behaviour of programs
running on real-time systems is vital information when developing and optimising
both hardware and software. As a part of further developing their Night Vision
system, Autoliv wanted to examine detailed timing behaviour of a specific part of
the Night Vision algorithm, namely the Tracking module, which tracks detected
pedestrians. Parallel to this, they also wanted a reliable method to obtain timing
data that would work for other parts of that system as well, or even other applications.
A preliminary study was conducted in order to determine the most suitable method
of obtaining the timing data desired. This resulted in a measurement-based approach
using software profiling, in which the Tracking module was measured using
various input data. The measurements were performed on simulated hardware
using both a cycle accurate simulator and measurement tools from the system
CPU manufacturer, as well as tools implemented specifically to handle input and
The measurements resulted in large amounts of data used to compile performance
statistics. Using different scenarios in the input data, we were able to obtain timing
characteristics for several typical situations the system may encounter during
operation. By manipulating the input data we were also able to observe general
behaviour and achieve artificially high execution times, which serves as indications
on how the system responds to irregular and unexpected input data.
The method used for collecting timing information was well suited for this particular
project. It provided the possibility to analyse behavior in a better way
than other, more theoretical, approaches would have. The method is also easily
adaptable to other parts of the Night Vision system, or other systems, with only
minor adjustments to measurement environment and tools.
Keywords: WCET, Dynamic timing analysis, CPU load
File: Click here to download/view the thesis
Author(s): Henrik Liljeroth
Contact: Simin Nadjm-Tehrani
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