The Essentials ofComputer(computer) 475

The Essentials ofComputer(computer) 475 - of the system If...

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Program Weighted Average 380 seconds 695 seconds Execution Frequency System A Execution Time System C Execution Time v w x y z 50% 30% 10% 5% 5% 50 200 250 400 5000 500 600 500 800 3500 TABLE 10.2 The Execution Mix for Five Programs on Two Systems and the Weighted Average of the Running Times of the system. If we have some indication of how frequently each of the five pro- grams are run during the daily processing on these systems, we can use the exe- cution mix to calculate relative expected performance for each of the systems. The weighted average is found by taking the products of the frequency with which the program is run and its running time. Averaging the weighted running times produces the weighted arithmetic mean. The running times for System A and System C from Table 10.1 are restated in Table 10.2. We have supplemented the running times with execution frequencies for each of the programs. For example, on System A, for every 100 of the combined executions of programs v , w , x , y , and z , program y runs 5 times. The weighted aver-
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