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CPI, CPu, Hyperthreading ( core i7 ) [Forums] I'm currently examining the impact of hyperthreading to different code snippets. While measuring the expected values with the most tests there is one test wich produces a confusing CPI.
for (... Posted: 2008-12-18 06:58:55Core i7 , High CPI , hyperthreading , LSD High Clocks Per Instruction Retired when vectorizing the loop. [Knowledgebase]
Introduction
Sometimes when we vectorize a loop, we get a high Clocks Per Instruction Retired (CPI) value. This happens when there is high bus utilization and the bus gets saturated.
The subtraction... Posted: 2008-12-28 11:30:00 by Om Sachan (Intel) BUS Saturation , hardware prefetcher , High CPI , Memoray latency , simd , SSE , SSE1 , SSE2 , SSE3 , SSE4 , Vectorizer , Vtune