test: stress benchmarks for concurrent rate limit and fanout (closes #388)#485
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Adds two benchmark files covering the concurrency-sensitive paths flagged in #388. The rate-limit bench fires 1000 concurrent calls at one identifier and asserts an exact 20/980 allowed/denied split, plus checkRateLimit() per-call latency. The fanout bench dispatches 500 children across 8 workers and asserts no drops or dupes, plus mixed success/failure batches and 50 concurrent fanOut calls of 10 children each. Both run only via bun benchmark in their dedicated CI job. closes #388 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Pulls Stats, computeStats, and printStats out of all three bench files into example/backend/__tests__/benchmark/stats.ts. printStats now takes an optional thresholdMs and suppresses the throughput line on single-iteration runs (where 1/duration is not a meaningful rate). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
rateLimit.bench.test.ts: 1000 concurrent hits on one identifier asserting an exact 20/980 allowed/denied split, 10-identifier isolation, and acheckRateLimit()per-call latency bench (~25k req/s on the dev box).fanout.bench.test.ts: 500 children dispatched across 8 workers asserting no drops or dupes, mixed success/failure batches with no cross-batch leakage, and 50 concurrentfanOutcalls of 10 children each.example/backend/__tests__/benchmark/so they run in the existing dedicatedbenchmarkCI job.Test plan