What Mom Never Told You About Multi-threading
summary
Parses two 30MB Wikipedia XML dumps and counts words using multiple approaches: plain threads and locks (~22s), a split-threaded run with concurrent hash map (~19s), RxJava merge (best first pass ~17s), and Kotlin coroutines (similar). Identifies XML I/O, object churn/GC and lock contention as real bottlenecks, shows a divide‑and‑conquer range split that drops time to ~14s, and insists on measurement, immutability, and picking the right tool.
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