csperf Diff: Comparing Two Runs Without Spreadsheet Chaos
Why this lesson exists In Slack threads you’ll often see two people paste a mean execution time and immediately start a debate. One says “my run is…
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Noise Sources: Affinity, Frequency, and Background Load — How to isolate and quantify non‑compiler variance with csperf
Why this lesson exists Unexplained variance in a csperf run often gets blamed on the compiler, when in fact the machine is the culprit. This episode…
Warmup Deep Dive: What You’re Throwing Away and Why
Why this lesson exists Warm‑up runs are the silent hero of performance measurement. When you skip them or treat the first run as the final result, y…
Backends 101: Choosing the Right Measurement Surface
Why this lesson exists When a program runs on a GPU, the only way to know where the real cost lies is to measure that GPU. Defaulting to the CPU sur…