The Essentials ofComputer(computer) 479

The Essentials ofComputer(computer) 479 - Mean Uniformly...

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Mean Arithmetic Uniformly Distributed Data X Geometric Skewed Data X Data Expressed as a Rate X Data Expressed as a Ratio X Indicator of System Performance Under a Known Workload X X X Harmonic Weighted Arithmetic TABLE 10.6 Data Characteristics and Suitability of Means each leg of the journey. The harmonic mean would have been the same if the car had traveled 100 miles (instead of 10) at 60 miles per hour. A harmonic mean does not tell us how much work was done, only the average rate at which it was done. The harmonic mean holds two advantages over the geometric mean. First, a harmonic mean is a suitable predictor of machine behavior. The result, therefore, has usefulness outside the realm of performance comparison. Secondly, more time-consuming programs have greater influence on the harmonic mean than less time-consuming ones. Not only does this fact weigh against “quick fix” optimiza- tions, it also reflects reality. Large, slow tasks have the potential of eating more machine cycles than smaller, faster ones. Consequently, we have more to gain by
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