Tag
statistical-error
- Sep 15, 2026 Comparing Two Profiles to Find a Regression That Is Real A differential flame graph is a difference of two sample sets on a shared layout; the normalisation, the noise floor, and frame identity each decide whether a red bar means anything. performance engineering
- Sep 20, 2025 How Many Samples a Profile Needs Before Its Numbers Mean Anything Sampling profiles are binomial estimates, not measurements; the arithmetic that turns sample counts into confidence intervals, and the differences a run can actually resolve. performance engineering
- Jan 12, 2023 Sampling Allocation Profilers and the Statistics of Estimates How a profiler that records one allocation in a few thousand still reports accurate totals, why the sampling must be size-weighted, and how the confidence interval is computed. memory systems