Authors: Cordes, Daniel Alexander
Title: Automatic parallelization for embedded multi-core systems using high level cost models
Language (ISO): en
Abstract: Nowadays, embedded and cyber-physical systems are utilized in nearly all operational areas in order to support and enrich peoples' everyday life. To cope with the demands imposed by modern embedded systems, the employment of MPSoC devices is often the most profitable solution. However, many embedded applications are still written in a sequential way. In order to benefit from the multiple cores available on those devices, the application code has to be divided into concurrently executed tasks. Since performing this partitioning manually is an error-prone and also time-consuming job, many automatic parallelization approaches were developed in the past. Most of these existing approaches were developed in the context of high-performance and desktop computers so that their applicability to embedded devices is limited. Many new challenges arise if applications should be ported to embedded MPSoCs in an efficient way. Therefore, novel parallelization techniques were developed in the context of this thesis that are tailored towards special requirements demanded by embedded multi-core devices. All approaches presented in this thesis are based on sophisticated parallelization techniques employing high-level cost models to estimate the benefit of parallel execution. This enables the creation of well-balanced tasks, which is essential if applications should be parallelized efficiently. In addition, several other requirements of embedded devices are covered, like the consideration of multiple objectives simultaneously. As a result, beneficial trade-offs between several objectives, like, e.g., energy consumption and execution time can be found enabling the extraction of solutions which are highly optimized for a specific application scenario. To be applicable to many embedded application domains, approaches extracting different kinds of parallelism were also developed. The structure of the global parallelization approach facilitates the combination of different approaches in a plug-and-play fashion. Thus, the advantages of multiple parallelization techniques can easily be combined. Finally, in addition to parallelization approaches for homogeneous MPSoCs, optimized ones for heterogeneous devices were also developed in this thesis since the trend towards heterogeneous multi-core architectures is inexorable. To the best of the author's knowledge, most of these objectives and especially their combination were not covered by existing parallelization frameworks, so far. By combining all of them, a parallelization framework that is well optimized for embedded multi-core devices was developed in the context of this thesis.
Subject Headings: Automatic parallelization
Embedded systems
High level cost models
Issue Date: 2013-12-20
Appears in Collections:Entwurfsautomatisierung für Eingebettete Systeme

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