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The Computer Journal 1979 22(3):209-219; doi:10.1093/comjnl/22.3.209
© 1979 by British Computer Society
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The use of a synthetic jobstream in performance evaluation

G. Haring1 *, R. Posch1 *, C. Leonhardt2 § and G. Gell2 §

1 Technical University of Graz, Steyrergasse 17, A 8010, Graz, Austria, 2 University of Graz, Universitatsplatz 3, A 8010, Graz, Austria

A new computer system is required to replace the existing UNIVAC 494 system for the universities at Graz. A synthetic jobstream matching the real batch load of the existing system was constructed using Buchholz's job (which was modified and transferred to FORTRAN). This synthetic jobstream was used for comparison of different computer systems as well as for the selection evaluation process itself. The construction of this synthetic jobstream is described in detail in this paper. The problems of characterising the real load are discussed explicitly. Special attention was given to the question of which parameters should be used, together with the decisions on the form of the scale and the sub-division of the range of the parameter values. Furthermore a procedure is given for an optimum of determination of the parameter values of the synthetic jobstream.

Received August 1977.

* Technical University of Graz, Steyrergasse 17, A 8010, Graz, Austria

§ University of Graz, Universitätsplatz 3, A 8010, Graz, Austria


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