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Some Empirical Observations on Program Behavior with Applications to Program Restructuring

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3 Author(s)
Peachey, J.B. ; Department of Agricultural Economics, University of Saskatchewan ; Bunt, R.B. ; Colbourn, C.J.

The dynamic behavior of executing programs is a significant factor in the performance of virtual memory computer systems. Program restructuring attempts to improve the behavior of programs by reorganizing their object code to account for the characteristics of the virtual memory environment. A significant component of the restructuring process involves a restructuring graph. An analysis of restructuring graphs of typical programs found edge weights to be distributed in a Bradford–Zipf fashion, implying that a large fraction of total edge weight is concentrated in relatively few edges. This empirical observation can be used to improve the clustering phase of program restructuring, by limiting consideration to edges of large weight. We consider the effect of this improved clustering in the restructuring process by examining various means of restructuring some typical programs. In our experiments, 95 percent of the total edge value is typically accounted for by 50–60 percent of the edges. For naive clustering algorithms, clustering time is therefore typically halved; for more sophisticated methods, more substantial savings result. Finally, clustering with 95 percent of total edge value typically results in only a small decay in performance measures such as number of page faults and average working set size.

Published in:

Software Engineering, IEEE Transactions on  (Volume:SE-11 ,  Issue: 2 )

Date of Publication:

Feb. 1985

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