An experimental model of system/360

ABSTRACT

The problem of predicting the performance of modern computer systems is formidable. One general technique which can ease this problem is macroscopic simulation. This paper reports on the applicability of that technique to System/360. The paper describes an experimental model of System/360—its hardware, software, and its environment. The measures of system performance produced by the model consist of statistics relating to turnaround time, throughput, hardware utilization, software utilization, and queueing processes. The model is mechanized in SIMSCRIPT and consists of some 1750 statements. An auxiliary program, the Job Generator, creates automatically the properties of System/360 jobs that get simulated.

REFERENCES

• 1: KATZ, J. H. Simulation of a multiprocessor computer system. Proc. AFIPS 1966 Spring Joint Comput. Conf., vol. 28, pp. 127-139.
• 2: IBM System/360 system summary. IBM Sys. Ref. Lib., A22- 6810-4, 1964.
• 3: IBM System/360 Operating System, operator's guide. IBM Sys. Ref. Lib., C28-6540-1, 1966.
• 4: IBM Operating System/360, job control language. IBM Sys. Ref. Lib., C28-6539-0, 1965.
• 5: IBM Operating System/360, concepts and facilities. IBM Sys. Ref. Lib., C28-6535-0, 1965.
• 6: DIMSDALE, B., AND MARKOWITZ, H. M. A description of the Simscript language. IBM Sys. J. 3, 1(1964), 57-67.
• 7: MARKOWITZ, H. M., HAUSNER, B., AND KARR, H. W. Simscript: A Simulation Programming Language. Prentice-Hall, Englewood Cliffs, N. J., 1963.

INDEX TERMS

Primary Classification:
  D. Software
  D.4 OPERATING SYSTEMS

Additional Classification:
  I. Computing Methodologies
  I.6 SIMULATION AND MODELING

General Terms:
Experimentation, Performance