Generation and Optimization of Real-Time Code for Embedded Multiprocess and Multiprocessor Systems (E = Mp2)

Fact Sheet

AcronymE = Mp2
NameGeneration and Optimization of Real-Time Code for Embedded Multiprocess and Multiprocessor Systems
(in German: Generierung und Optimierung von Echtzeitfähigem Code für Eingebettete Multiprozess- und Multiprozessor-Systeme)
Role of TUHHApplicant
Start Date01/02/2012
End Date30/09/2017
Funds DonorDeutsche Forschungsgemeinschaft (DFG)


During the design of safety-critical real-time systems like, e.g., airbag or flight attitude controllers, their behavior is specified at a high abstraction level. Compilers are an indispensible tool on the way from such a model-based specification to an actual implementation. For singlecore and singleprocess systems, compilers have recently been extended to support real-time properties already during compilation. For multiprocess and multiprocessor systems, compilers currently lack such a support despite of the increasing relevance of such parallel systems.

E = Mp2 aims to provide a software development environment for multiprocess and multiprocessor systems which produces efficient and optimized program code that provably meets real-time constraints. For this purpose, it has to be clarified how compiler and scheduler of an operating system need to cooperate. In addition, novel timing models supporting response times of processes and schedulability of entire systems need to be developed. Based on these timing models, novel compiler optimizations targeting on worst-case timing aspects and schedulability are designed.

In multiprocess systems, tasks can preempt each other and thus interfere. E = Mp2 develops compiler optimizations considering such context switches and scheduling strategies. In multiprocessor systems, different cores can access shared resources (e.g., buses or memories) at the same time and thus can cause additional interference. Therefore, this project works on compiler optimizations minimizing the worst-case timing of such systems by considering accesses to shared resources.

E = Mp2 Publications of the Embedded Systems Design Group

Title: Code Optimization of Periodic Preemptive Hard Real-Time Multitasking Systems. <em>In Proceedings of the 18th International Symposium on Real-Time Distributed Computing (ISORC)</em>
Written by: Arno Luppold and Heiko Falk
in: April (2015).
Volume: Number:
on pages: 35-42
Series: 20150416-isorc-luppold.pdf
Address: Auckland / New Zealand
ISBN: 10.1109/ISORC.2015.8
how published: 15-80 LuFa15a ISORC

Note: aluppold, hfalk, ESD, emp2, tacle, WCC

Abstract: In hard real-time systems, each task has to provably finish its execution within its respective deadline. Compiler optimizations can be used to improve each task's timing behavior. However, current compilers do not consider tasks' deadlines and can therefore not be used to reliably optimize hard real-time systems with regard to its schedulability. We propose a compiler optimization framework based on Integer-Linear Programming which allows for schedulability aware code optimizations of hard real-time multitasking systems. We evaluate the framework using an instruction scratchpad optimization. The results show that our approach can be used to improve the schedulability of hard real-time systems significantly.