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Unformatted text preview: – time spent executing actual instructions of “our” program Performance – Performance = Program Executions/Time (executions/sec) X is n times faster than Y means Performance X / Performance Y = n Clock Cycles Cycle Time – time between ticks = seconds per cycle Clock Rate – cycles per second (frequency) Computer Performance Measure How To Improve Performance cycle time (seconds per cycle) clock rate (cycles per second) CPI (average clocks per instruction) a floating point intensive application might have a higher CPI MIPS (millions of instructions per second) this would be higher for a program using simple instructions CPI Freq IPS M = cycle second program cycles program seconds × = Benchmarks Performance best determined by running a real application SPEC (System Performance Evaluation Cooperative) Amdahl’s Law unaffecte speedup affected improved t r t t + =...
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- Fall '08
- MIPS, Cycle Time, Clock rate, Central processing unit, CPU time