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SystemTechniques · 41Primitives · 114 job-board Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Budget pacingfinance · medium: Spreading an advertiser budget over the day via throttling or bid multipliers with a feedback controllerRanked-slot auction (GSP and VCG)finance · medium: Rank bidders by bid × quality, give them the k positions in order, and charge each the minimum bid that would keep their rank (GSP); VCG is the truthful reference.›Address geocodinggeometry · medium: Parse, normalize and fuzzy-match postal addresses to coordinates and backEntity linkingmachine-learning · medium: Map each mention to a knowledge-base id, or to NIL, by generating candidates from an alias table, scoring them on prior and context, and thresholding.›Feature interaction modelsmachine-learning · medium: Click/conversion prediction networks for ranking: feature crosses (DCN, DeepFM), embedding bags, calibrationGeospatial cell index (geohash, S2,…geometry · low: Map a lat/lon to a 64-bit cell id on a hierarchical grid, so "near" becomes an integer range scan in any ordinary sorted index.›Robots exclusion protocolsearch-sort · low: Decide per URL whether a crawler may fetch it from a host's robots.txt (RFC 9309): status-code rules, group choice, longest-match Allow/Disallow, 24 h cache.›BM25 rankingsearch-sort · low: The standard lexical relevance score: IDF-weighted term frequency with saturation (k1) and length normalization (b); default in Lucene, Elasticsearch and SQLite FTS5.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesProcess supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›PDF text extractionmachine-learning · low: Rebuild words, lines, columns and reading order from the glyph positions a born-digital PDF stores, and route pages without usable text to OCR.›Open and click trackingnetworking · low: Tracking pixels and signed redirect links for engagement eventsQuery expansionsearch-sort · low: Rewriting queries with synonyms, pseudo-relevance feedback or LLM-generated variants (multi-query, HyDE)SimHashsearch-sort · low: Charikar's random-hyperplane sketch: a 64-bit fingerprint per document whose Hamming distance tracks cosine similarity, searchable in sub-linear time by exact block matches.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Graceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Cooperative schedulingconcurrency · low: Green threads/coroutines yielding at await points on a user-space schedulerRecord replaydistributed · low: Record every nondeterministic input (time, randomness, I/O, model and tool outputs, per-tick player input) and re-execute deterministically for debugging, replays and state rebuildPRNGs (PCG, xoshiro)numerics · low: Small, fast, statistically strong non-cryptographic generators: PCG32 and xoshiro256**, with seeding, parallel streams and unbiased ranges.›Leasesdistributed · low: A lock that expires on its own: bounded-time ownership that survives crashes and partitions, given bounded clock drift and fencing tokens on writes.›Write-ahead logstorage · low: Append each change to a checksummed sequential log and fsync it before touching data pages; the basis of crash durability in nearly every database.›+ 34 more techniques+ 98 more primitives

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