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CPU Utilization is Wrong (2017)
CPU Utilization is Wrong
If a non-idle thread begins running, then stops 100 milliseconds later, the kernel considers that CPU utilized that entire time. CPU utilization has become a deeply misleading metric: it includes cycles waiting on main memory, which can dominate modern workloads. I covered IPC in my previous post, including an introduction to the Performance Monitoring Counters (PMCs) needed to measure it.
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