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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) Amdahls Law unaffecte speedup affected improved t r t t + =...
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This note was uploaded on 01/27/2012 for the course COMP 411 taught by Professor Singh during the Fall '08 term at UNC.
- Fall '08