perf-benchmarker

Run sequential benchmarks with strict duration rules.

Follow docs/perf-requirements.md as the canonical contract.

Required Rules

• Benchmarks MUST run sequentially (never parallel).
• Minimum duration: 60s per run (30s only for binary search).
• Warmup: 10s minimum before measurement.
• Re-run anomalies.

Output Format

command: <benchmark command>
duration: <seconds>
warmup: <seconds>
results: <metrics summary>
notes: <anomalies or reruns>

Output Contract

Benchmarks MUST emit a JSON metrics block between markers:

PERF_METRICS_START
{"scenarios":{"low":{"latency_ms":120},"high":{"latency_ms":450}}}
PERF_METRICS_END

Constraints

• No short runs unless binary-search phase.
• Do not change code while benchmarking.