Systems Research and Architecture Group (SRA)

Fachgebiet System- und Rechnerarchitektur

Our Research and Teaching activities are centered around the architecture of computing systems: From hardware over system software up to languages and compilers with a focus on constructive methods for the design and development of adaptable and versatile system software. The group is led by Prof. Daniel Lohmann.

Cherrapunjee Rain Forests" ( CC BY-SA 2.0) by  ashwin kumar

Embedded

Those machines that are closest to our everyday life are special-purpose systems embedded into the physical world. Due to this embedding, we know a lot about the surroundings of a system. We exploit this knowledge in the design of hardware and system software.

Tailored

The requirements for every system are special. However, we often favor unspecific general-purpose components over special-purpose solutions. With the techniques of automatic tailoring, we can achieve specialized systems at moderate development costs.

Systems

During the architectural design, the required functionalities are often well understood. Nonfunctional aspects are decisive for choosing a system for a given task. Especially for embedded systems, we can optimize various aspects towards the given application scenario.

News and Trivia

2021-09-01 New DFG Grant: Configurability-Aware Design of Operating Systems
CADOS: Configurability-Aware Development of Operating Systems (DFG: LO 1719/3-2)
In the CADOS project, we investigate scalable methods and tools to deal with the implementation of variability across all implementation layers of modern system software.
The German research foundation DFG is supporting our CADOS project for another two years with two positions for doctoral researchers (E13), two positions for student researchers, and some additional lab equippment.
2021-06-22 Data-Flow–Sensitive Fault-Space Pruning for the Injection of Transient Hardware Faults at LCTES '21

Oskar Pusz presents Data-Flow–Sensitive Fault-Space Pruning for the Injection of Transient Hardware Faults at the Conference on Languages, Compilers and Tools for Embedded Systems (LCTES '21).

In the paper, we describe Data-Flow–Sensitive Fault-Space Pruning (DFP), a new precise and fault-space–complete data-flow sensitive fault-space pruning method that extends on def/use-pruning by also considering the instructions’ semantics when deriving fault-equivalence sets. In our experimental evaluation, this already reduces the number of necessary injections by up to 18 percent compared to def/use pruning.

The DFP is the core element in the ISA level of our research project CLASSY-FI.

The source code and evaluation artifacts are available here: Source Code and Evaluation Data for the Paper: Data-Flow–Sensitive Fault-Space Pruning for the Injection of Transient Hardware Faults.

2021-05-21 ARA: Static Initialization of Dynamically-Created System Objects at RTAS '21

Björn Fiedler presents our paper ARA: Static Initialization of Dynamically-Created System Objects at the 27th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS '21).

In the paper, we present ARA, a framework for static specialization of operating systems for embedded systems. ARA is capable to statically detect operating-system objects dynamically created during run-time and replace them by statically prepared equivalents. ARA is a major building block of our reserch project AHA towards the goal to fully automatically analyze and specialize applications and their system software.

The presentation videos, source code and evaluation artifacts are available at the paper's details page: ARA: Static Initialization of Dynamically-Created System Objects

2021-04-01 Christian Dietrich becomes Juniorprofessor at TUHH!

After many fruitful years with dozen of papers, great lectures and a lot of fun together, Christian Dietrich leaves our group to start his Juniorprofessorship (W1-TT-W3) with a new operating system group at TUHH. We will continue our work together, nevertheless miss him a lot, and wholeheartedly congratulate Prof. Dr.-Ing. Christian Dietrich for this great step in his career!

2021-03-12 Christian Dietrich Receives GI/ITG-FGBS Award for Best Doctoral Thesis

Christian Dietrich receives an award for the best doctoral thesis in the field of operating systems. The award is granted annually by the SIG on Operating Systems of the German Computer Assiciation (GI Fachgruppe Betriebssysteme) solely on the base of scientific excellence. It includes a price money of 500 €. Congrats, Christian!

In his dissertation Interaction-Aware Analysis and Optimization of Real-Time Application and Operating System, Christian designs and implements a control-flow--sensitive whole-system view and analysis on the interactions within real-time systems. With this approach, he can overcome many inefficiencies that arise from analyses that have an isolating focus on individual system components. Furthermore, the interaction-aware methods keep close to the actual implementation, and therefore are able to consider the behavioral patterns of the finally deployed real-time computing system.

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