Fehlertolerierende Rechensysteme: 2. GI/NTG/GMR-Fachtagung / by P. Corsini, L. Simoncini, L. Strigini (auth.), K.-E.

By P. Corsini, L. Simoncini, L. Strigini (auth.), K.-E. Großpietsch, M. Dal Cin (eds.)

In the decade of laptop technology improvement, we will realize a becoming curiosity in fault-tolerant computing. This curiosity is the results of a emerging variety of appl'ications the place trustworthy operation of computing structures is an important requirement. in addition to easy study within the box of fault-tolerant computing, there's an expanding num­ ber of platforms specifically designed to accomplish fault-tolerance. it's the target of this convention to supply a survey of current examine and improvement actions in those parts. the second one GI/NTG/GM~ convention on Fault-Tolerant Computing platforms has had a preparatory time of approximately years. In March 1982, the 1st GI convention bearing on fault-tolerant computing platforms was once held in Munich. one of many result of the convention was once to carry an organiza­ tional framework to the FTC neighborhood in Germany. This ended in the founding of the typical curiosity team "Fault-Tolerant Computing structures" of the Gesellschaft fur Informatik (GI), the Nachrichtentechnische Gesellschaft (NTG), and the Gesellschaft fur MeB- und Regelungstechnik (VDI/VDE-GMR) in November 1982. at the moment, it was once additionally made up our minds to agenda a biannual convention on fault-tolerant computing structures. one of many ambitions of this moment convention is to reinforce the family members with the foreign FTC group; hence, the decision for papers used to be prolonged not just to German-speaking nations, yet to different nations as well.

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Extra info for Fehlertolerierende Rechensysteme: 2. GI/NTG/GMR-Fachtagung / Fault-Tolerant Computing Systems 2nd GI/NTG/GMR Conference / Bonn, 19.–21. September 1984

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Otherwise, the filename is inserted into the directory structure and the address of the file is returned. Note that the result of the create operation does not depend on the result of the insert, the balance or the charge operation. This is indicated by the async keyword. A file is accessed through read and write operations. We describe write in detail. For the sake of brevity, assume the data fit into the allocated space.

Operations 01 and 02 eommute if the predicate evaluates to true. In certain cases, it is possible to identify non-conflicting operations automatically in particular, if they access disjoint sets of data items. The ISIS concurrency control mechanism evaluates conflict predicates at runtime to determine whether operations commute. If they commute, they can be serialized in an order different from the serialization order of their parent operations. Normal locking schemes do not take advantage of this; out algorithm includes a mechanism to exploit this aspect of commutativity to achieve greater concurrency.

This information is passed to the recovery finger that evaluates the dependencies between different recovery units and transfers the results to the recovery subsytem to update the recovery graph. 8. Distributed system control The system tasks implied by the introduced concepts shall be performed without a central system control. e. the system has to offer him a set of global objects and a set of functions to build structured system-wide computations from atomic actions. For those tasks which in their structure are not confined to one site, it is 38 necessary to establish a system-wide cooperation of sUbsystems.

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