Two Locks on a Green Build: Prompt Hashes and RSS Caps for AI C++ Evals
This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.
A patch landed with every assertion green. The return values matched the golden file. Then a latency dashboard moved: an inner loop that once touched a stack buffer now called std::vector::resize on every request. The eval harness never measured RSS or wall time, and it never hashed the prompt that…
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- 2026-09-23 16:26 · DEV Community — AI
Two Locks on a Green Build: Prompt Hashes and RSS Caps for AI C++ Evals