Two kinds of numbers live in this directory:

1. Quality / retrieval — longmemeval-bench.ts, quality-eval.ts, real-embeddings-eval.ts, scale-eval.ts. Recall, precision, token savings. Documented in LONGMEMEVAL.md, QUALITY.md, REAL-EMBEDDINGS.md, SCALE.md.

2. Load shape — load-100k.ts. p50 / p90 / p99 latency and throughput against a running daemon. This is the file you want when somebody asks "what's p99 at 100k memories under concurrency 100?".

Hand-rolled, dependency-free load harness. Issues real HTTP against a local agentmemory daemon at http://localhost:3111, records per-request latency with performance.now(), and writes a JSON report per run.

For each cell in the matrix (N, concurrency, endpoint) it records:

• p50_ms, p90_ms, p99_ms — nearest-rank percentiles.
• min_ms, max_ms, ops, errors.
• throughput_per_sec — wall-clock ops / sec for that cell.

Default matrix:

• N ∈ {1000, 10000, 100000} — number of memories seeded before the cell runs.
• C ∈ {1, 10, 100} — concurrent in-flight requests during the cell.
• Endpoints under test:
  • POST /agentmemory/remember
  • POST /agentmemory/smart-search
  • GET /agentmemory/memories?latest=true

Each cell issues BENCH_OPS=200 requests by default — enough samples for stable p99 without dragging a 100k-seed run past tens of minutes.

p50 tells you the median request feels fast. p90 tells you the bulk of requests feel fast. p99 tells you the request your tail user hits when they really need it feels fast. Capacity planning lives here — if you want to size a fleet, scale your daemon, or set an SLO, p99 is the number to plan against. p50 will lie to you.

# 1. Start the daemon however you normally do (npx, Docker, etc.)
npx @agentmemory/agentmemory

# 2. From the repo root, in another shell:
npm run bench:load

To override the matrix:

BENCH_N=1000 BENCH_C=1,10 BENCH_OPS=100 npm run bench:load

To have the harness spawn a daemon for the run (after npm run build):

AGENTMEMORY_BENCH_AUTOSTART=1 npm run bench:load

Other env knobs (see the file header for the canonical list):

• AGENTMEMORY_URL — base URL of the daemon (default http://localhost:3111).
• BENCH_SEED — seed for the mulberry32 content RNG. Same seed + same daemon build = byte-identical seed corpus.
• BENCH_OUT_DIR — where the JSON report lands (default benchmark/results/).

benchmark/results/load-100k-<short-git-sha>.json. The harness mkdir -ps the directory. The file has a schema_version: 1 field so future format changes don't silently break consumers.

Synthetic memory content is built from a small noun / verb / concept vocabulary fed by a mulberry32(BENCH_SEED) PRNG. Same seed + same build = same corpus. The point isn't "realistic" content (there isn't one realistic content); the point is reproducibility — re-running the harness against the same git sha should give the same content mixture going in, so latency variance comes from the daemon and not from JSON payload jitter.

The release flow appends a ## Performance section to CHANGELOG.md referencing the JSON in benchmark/results/ for that release's git sha. p99 is the headline number; the JSON is the receipt.