By Achim Basermann, Hans-Peter Kersken (auth.), Christian Bischof, Heinz-Gerd Hegering, Wolfgang E. Nagel, Gabriel Wittum (eds.)
This publication provides the cutting-edge in simulation on supercomputers. prime researchers current effects accomplished on structures of the Gauss-Allianz, the organization of High-Performance Computing facilities in Germany. The reviews conceal all fields of computational technology and engineering, starting from CFD to Computational Physics and Biology to desktop technological know-how, with a distinct emphasis on industrially correct purposes. featuring effects for large-scale parallel microprocessor-based structures and GPU and FPGA-supported structures, the booklet makes it attainable to match the functionality degrees and value of varied architectures. Its notable ends up in attaining the top functionality for construction codes are of specific curiosity for either scientists and engineers. The ebook contains a wealth of colour illustrations and tables.
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Additional resources for Competence in High Performance Computing 2010: Proceedings of an International Conference on Competence in High Performance Computing, June 2010, Schloss Schwetzingen, Germany
Moreover, it stores the respective dependency relations redundantly, so that they can be retrieved. Thus, assuming only independent failures, the system can recover with high probability. A simple collapsing rule determines which of the past CTRs may be combined without violating the said redundancy rule. Combining two CTRs (on the same node), allows to eliminate superfluous redundancy. Consider, for example, a chain of dependent CTRs: A depends on B, and B depends on C . If A and B happen to be stored on the same node, the system may combine A and B and thereby eliminate all GAO versions from B that have been updated in A.
Fuhrmann transaction operates on local copies of the GAOs, only. Thus, a transaction does not directly modify the GAOs. if two transactions have modified the same GAO. If so, all but one of the conflicting transactions must roll back. They can do so very easily, because the GAOs have not yet been modified and the runtime system thus only has to discard the (modified) local copies. The local copies of the succeeding transactions, however, become the new head versions of the respective GAOs. Thus, a GAO seemingly migrates to the processing node that has most recently committed an update for that GAO.
For example, we plan to study solutions that allow applications to have side-effects. network communication. This issue has already been studied in the research community, but we have to see which of these solutions fits best into J-Cell. Furthermore, we want to study how we can best support applications that use lock-based synchronization. We expect that the fundamental concept of GAOs and GAO versions carries over to lock-based synchronization; but we need to complement our protocols with protocols for obtaining and releasing locks.