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Practical, Linux-first guide to trustworthy vector database benchmarking: bash-friendly apt/dnf/zypper setup, a reproducible harness to generate data or plug in embeddings, and measurements of recall@k, p50/p95 latency and QPS for FAISS (in-process) and Qdrant (via Podman). Match recall before comparing speed, pin CPUs, test filters/concurrency, track cost, and extend the script to other engines.