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nio2: NIO.2 file API companion code (streaming 5 GB at -Xmx64m, handle leaks, WatchService, mmap)

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
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asmhatre
2026-09-30 19:14:31 +00:00
co-authored by Claude Sonnet 5.5
parent f4b732799d
commit 1ac2f6077a
30 changed files with 1072 additions and 0 deletions
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nio2/output/13-mapped.txt
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$ java -Xmx64m MappedDemo big.log
file big.log: 5,000,000,069 bytes, -Xmx=64 MiB, RSS at start=40 MiB
classic map of the whole file: IllegalArgumentException: Size exceeds Integer.MAX_VALUE
Arena + MemorySegment: 34,120,522 newlines in 5.1 s; RSS after the Arena was closed=51 MiB
classic 1 GiB windows: 34,120,522 newlines in 7.8 s; RSS right after=4821 MiB
heap: -Xmx=64 MiB, peak used (sampled every 20 ms)=4 MiB, GC collections=0, GC time=0 ms
RSS one second after System.gc()=52 MiB