Server CPU Utilization: Don't Be Fooled by the Numbers!
2025-09-03
Do you rely on server CPU utilization to assess server performance? This author ran a series of stress tests and discovered that CPU utilization isn't linearly correlated with actual work efficiency. Especially above 50% utilization, hyperthreading and Turbo Boost significantly skew the relationship, leading to much higher actual throughput than the reported utilization suggests. Instead of relying on CPU utilization, the author recommends benchmarking to measure actual work completed for a more accurate assessment of server performance.