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Subect: Architecture-Performance
Performance is a subjective quatity that is often argued about by those who are affected by it. However we can make a general statement about performance:
performance = 1 / (Execution time or response time)
The more general problem comes when we start agregating different performance metrics. Say we run 5 different programs and measure their running time. How do we agregate them? We can use a weighted average or a straight sum average.
Relative Performance
Execution Time of Y 1/Performance Y Performance X
If X is n times faster than Y, n = --------------------- = ----------------- = ---------------
Execution Time of X 1/Performance X Performance YSystem Performance is based on the ElapsedTime of an unloaded system
Cpu Performance is pased on the CPU Execution time (CpuTime - user time)
Peformance must be tied to execution time, no other measure of performance works!
See ThroughPut, ResponseTime, CyclesPerInstruction, GeometricMean
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