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- ZeitschriftenartikelScaling Results for a Discontinuous Galerkin Finite-Element Wave Solver on Multi-GPU Systems(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Rietmann, Max; Schenk, Olaf; Burkhart, HelmarMax Rietmann, Olaf Schenk, Helmar Burkhart
- ZeitschriftenartikelAn OpenCL-based Parallel Coder for Erasure-tolerant Storage(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Hegen, Peter; Sobe, PeterErasure-tolerant coding protects against data loss (erasure) in storage systems by calculating redundant data elements and spreading original and redundant data across several devices. This allows to reconstruct data in case of device failures. Code calculations can be done on the GPU using OpenCL. This allows a highly parallel execution and moves the computational cost away from the CPU. In this paper we introduce a methodology for coding using OpenCL. It consists in a preparation of XOR equations and their compilation to OpenCL kernels.
- ZeitschriftenartikelPeelsched: a Simple and Parallel Scheduling Algorithm for Static Taskgraphs(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Keller, Jörg; Gerhards, RainerWe present a new algorithm, which we call P EELSCHED, to schedule a set of tasks with precedence constraints and communication costs onto a parallel computer with homogeneous processing units. The algorithm is deterministic and simple, and can be parallelized itself. The new algorithm is based on the usage of structural graph properties, in particular series-parallel or N-free graphs, but can be used on any DAG. We provide an implementation and validate it against a benchmark suite of task graphs. We find that the algorithm's scheduling results are comparable to strictly sequential schedulers.
- ZeitschriftenartikelKurzlebige Zertifikate in einem Gridportal-Szenario(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Pinkernell, Stefan; Fritzsch, BernadetteStefan Pinkernell, Bernadette Fritzsch Alfred Wegener Institut für Polar- und Meeresforschung, Bremerhaven, Deutschland stefan.pinkernell@awi.de, bernadette.fritzsch@awi.de
- ZeitschriftenartikelBeschleunigte Verifikation von analogen Schaltungen durch Multi-Thread und Multi-Job-Ansätze mit Simulatoren(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Sobe, Udo; Graupner, Achim
- ZeitschriftenartikelIs There Hope for Automatic Parallelization of Legacy Industry Automation Applications?(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Kempf, Stefan; Veldema, Ronald; Philippsen, MichaelMulticore processors have become common in desktop workstations. The trend towards multicores extends to consumer embedded systems like smartphones. In the future, systems for industry automation will also use multiprocessors. In order to migrate legacy industry automation codes to the new hardware platforms, they must be parallelized. As manual parallelization is known to be error-prone, an automatic parallelization is desirable. We investigate how well legacy applications are suited to an automatic parallelization at the function level. We use compiler analyses to determine the amount of parallelism in the program and calculate the potential speedup. We analyze a total of 44 factory control programs to understand how well real codes can be parallelized and show that 13 codes can be parallelized with a reasonable speedup.
- ZeitschriftenartikelEURO-PAR 2012(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011)
- Zeitschriftenartikel24. PARS — Workshop(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011)
- ZeitschriftenartikelRun, Stencil, Run!(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Burkhart, Helmar; Christen, Matthias; Rietmann, Max; Sathe, Madan; Schenk, OlafA Comparison of Modern Parallel Programming Paradigms Helmar Burkhart, Matthias Christen, Max Rietmann, Madan Sathe, Olaf Schenk
- ZeitschriftenartikelEfficient Synchronization Techniques in a Decentralized Memory Management System Enabling Shared Memory(PARS: Parallel-Algorithmen, -Rechnerstrukturen und -Systemsoftware: Vol. 28, No. 1, 2011) Mattes, Oliver; Schindewolf, Martin; Sedler, Roland; Buchty, Rainer; Karl, WolfgangThe rising integration level enables combining more logic on a single chip. This is exploited in multiprocessor systems-on-chip (MPSoCs) or manycore research prototypes such as the Intel SCC. These platforms offer access to shared memory over a limited number of controllers which may lead to congestion. In order to scale the memory with the core count, the memory management must become more flexible and distributed in nature. In the near future decentralized systems with multiple selfmanaging memory components will arise. The problem tackled in this paper is how to realize synchronization mechanisms for coincident access to shared memory in such a decentralized memory management system. Furthermore, improvements of the distributed synchronization mechanism are integrated and evaluated. To speed up the synchronization, additional logic in the form of a locks queue, is added. In order to reduce the network traffic this is combined by extending the synchronization protocol with exponential backoff. In the evaluation, side effects of combining both techniques are discussed and explained.