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Facing the Multicore-Challenge III: Aspects of New Paradigms by Michael Bader, Hans-Joachim Bungartz, Martin Schreiber

By Michael Bader, Hans-Joachim Bungartz, Martin Schreiber (auth.), Rainer Keller, David Kramer, Jan-Philipp Weiss (eds.)

This cutting-edge survey positive factors issues with regards to the impression of multicore, manycore, and coprocessor applied sciences in technology and large-scale purposes in an interdisciplinary setting. The papers integrated during this survey conceal examine in mathematical modeling, layout of parallel algorithms, elements of microprocessor structure, parallel programming languages, hardware-aware computing, heterogeneous systems, manycore applied sciences, functionality tuning, and standards for large-scale functions. The contributions awarded during this quantity are an consequence of an inspiring convention conceived and arranged by way of the editors on the college of technologies (HfT) in Stuttgart, Germany, in September 2012. the ten revised complete papers chosen from 21 submissions are awarded including the twelve poster abstracts and concentrate on mixture of latest points of microprocessor applied sciences, parallel functions, numerical simulation, and software program improvement; therefore they essentially express the possibility of rising applied sciences within the quarter of multicore and manycore processors which are paving the best way in the direction of own supercomputing and extremely most probably in the direction of exascale computing.

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Extra info for Facing the Multicore-Challenge III: Aspects of New Paradigms and Technologies in Parallel Computing

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If explicit locks are used, only short waiting times 1 . occur, resulting in an execution time decrease to approximately 15 In a second test on the same AMD machine, a certain amount of computation was performed between two addition operations. The duration of this additional computation was varied. The results for the scenarios (i)–(iii-c) as defined above are shown in Fig. 3b. The curves show the execution time needed by 24 threads for 15 million addition operations on one variable including the time for the additional computation.

Algorithm 2 uses this function for an alternative implementation of Alg. 1: Instead of reducing the local solution vectors y◦ to the overall solution vector y globally at the end of the parallel execution (Lines 8 to 10 in Alg. 1), each vector entry of y ◦ is now added individually to the corresponding entry of y. Each update of an entry is synchronised by using an atomic addition operation (Line 8 in Alg. 2). Atomic Operations Using Compare & Swap. For many operations, such as addition, subtraction or logical operations, there exist atomic hardware instructions on most common platforms.

Facing the Multicore-Challenge III 2012, LNCS 7686, pp. 25–36, 2013. c Springer-Verlag Berlin Heidelberg 2013 (3) 26 M. Balg et al. where the vector u consists of all u(k) and represents the solution u. A denotes the system matrix, called stiffness matrix, and b the right-hand side, called load vector. Using the restriction of the ansatz for each element, the given problem decomposes into a sum of element-wise contributions: A= el Ltel Ael Lel and b= el Ltel bel (4) with appropriate projections Lel and Ltel .

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