The industry standard for static timing analysis.
aiT WCET Analyzers statically compute tight bounds
for the worst-case execution time (WCET) of tasks in real-time systems.
They directly analyze binary executables and take the intrinsic cache
and pipeline behavior into account.
In real-time systems, timely task completion is of
the essence. Each real-time task has to be completed within a specified
time frame in order to ensure that the system works correctly. In other
words, it is essential that the WCET of each task is known.
However, computing the WCET is a challenge:
“Testing, in general, cannot show the absence of errors.”
- Testing by repeatedly measuring the execution time of a task is
not only tedious, but also typically not safe. It is often
impossible to prove that the conditions determining maximum execution
time have been taken into account.
- Modern processor components such as caches and pipelines complicate
the task of determining the WCET considerably, since the execution time
of a single instruction may depend on the execution history.
- Analysis methods that do not consider cache and pipeline behavior
typically overestimate the WCET by several orders of magnitude, thus
leading to a substantial waste of hardware resources.
aiT WCET Analyzers provide the solution to these problems:
they statically analyze a task’s intrinsic cache and pipeline
behavior based on formal cache and pipeline models. This enables
correct and tight upper bounds to be computed for the
worst-case execution time.
aiT was designed in the
IST project DAEDALUS according to
the requirements of Airbus France for validating the timing
behavior of critical avionics software, including the
flight control software of the A380,
the world’s largest passenger aircraft.
The analyzers are based on the technique of
abstract interpretation. A graphical
user interface supports the visualization
of the worst-case program path and the interactive inspection of
all pipeline and cache states at arbitrary program points.
- aiT-computed bounds are extremely tight
and thus reflect the actual performance of your system.
Ensuring deadline adherence is not done at the expense of hardware resources.
- aiT-computed bounds are valid for all inputs and
each execution of a task. Extensive timing testing is a thing of the past.
- aiT directly analyzes binary executables. It is widely independent of
the compiler and source code language used. This means no modification
of your toolchain or the system’s operational behavior and performance
Seamless integration into your toolchain
aiT supports tight integration with many state-of-the-art development tools, including:
- SCADE Suite, the market-leading embedded-software development environment from Esterel
- ASCET modeling tools from ETAS
- SymTA/S scheduling analysis tools from Symtavision
- WCC, the first WCET-aware C compiler from TU Dortmund
- RT-Druid, the Eclipse-based development environment from Evidence
- T1, the runtime measuring software from Gliwa
aiT can also be combined with other analysis tools from AbsInt
(e.g. StackAnalyzer for stack usage analysis) in a single
intuitive user interface called ał.
aiT is available for a growing number of target processors and compilers.
We offer special qualification support
- Qualification Support Kits (QSKs) that simplify the qualification process for DO-178B level A and
- Qualification Software Life Cycle Data (QSLCD) Reports that document
our development processes, including all verification and quality assurance activities.
In the past, our QSKs and QSLCD Reports have been successfully used by leading
corporations in their DO-178B qualification process, notably in the avionics industry.
aiT is also an integral part of the
SCADE development environment, which is DO-178B qualified
up to level A for Military and Aerospace Industries, IEC 61508 certified at SIL 3
by TÜV for Heavy Equipment and Energy, and EN 50128 certified at SIL 4 by
TÜV for Rail Transportation.
Request your free trial package today.