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The Computer Journal 1979 22(3):234-239; doi:10.1093/comjnl/22.3.234
© 1979 by British Computer Society
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Loop optimisation for parallel processing

M. Di Manzo1 *, A. L. Frisiani1 * and G. Olimpo2 §

1 Facolta di Ingegneria, Istituto di Elettrotecnica, Universita di Genova, Viale Francesco Causa 13, Genova, Italy, 2 Laboratorio per le Technologie Didattiche, CNR, Genova, Italy

The problem of loop optimisation for parallel processing is examined in this paper and a method is proposed to evidence the inherent parallelism in a FORTRAN-like loop. The method is based on the concept of interrupting tasks and imposes little restrictions on the loop structure. Parallelism is achieved by concurrent execution of the loop body for different sets of values for the indices; processors, activities must be synchronised and therefore the approach is best suited for SIMD machines, even if it can be used also on other kinds of multiprocessor machines provided that the processor switching and synchronising cost is low.

In diesem Beitrag wird die Frage von der Ring-Optimisierung für parallele Verfahren geprüft und eine Methode vorgeschlagen, um den inneren Parallelismus in einem FORTRAN-ähnlichen Ring in den Vordergrund zu stellen. Die Methode gründet sich auf den Begriff von interferieren den Aufgaben und erlegt kleine Einschränkungen auf die Ring-Struktur auf. Der Parallelismus wird durch eine beitragende Ausführung von dem Ring-Körper für verschiedene Reihen von den Indexwerten erreicht; Prozessorentätigkeiten müssen synchronisiert werden und deshalb ist der Annäherungsweg am besten für SIMD-Maschinen verfolgt, auch wenn er auch bei anderen Typen von Multiprozessorenmaschinen benutzt werden kann. wenn der Prozessorschaltung-und Synchronisationkosten niedrig sind.

Received December 1976.

* Facolta di Ingegneria, Istituto di Elettrotecnica, Università di Genova, Viale Francesco Causa 13, 16145 Genova, Italy

§ Laboratorio per le Technologie Didattiche, CNR, Genova


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