These overestimates are due to the time spent

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Unformatted text preview: he instructions and data for the new task get loaded into the cache. Thus the processor does not run as efficiently when switching between our program and other activities as it would if it executed our program continuously. This factor will tend to increase ÌÑ relative to Ì . We discuss how we can determine the value of Ì for our sample computation later in this chapter. Figure 9.8 shows the results of this experiment running under two different loading conditions. The graphs show our measurements of the error rate, defined as the value of ´ÌÑ Ì µ Ì as a function of Ì . This error measure is negative when ÌÑ underestimates Ì and is positive when ÌÑ overestimates Ì . The two series show measurements taken under two different loading conditions. The series labeled Load 1” shows the case where the process performing the sample computation is the only active process. The series labeled “Load 11” shows the case where 10 other processes are also attempting the same computation. The latter represents a very heavy load condition; the system is noticeably slow respondi...
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