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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/03-stream-lines.txt
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$ java -Xmx64m -Xlog:gc StreamLines lines big.log
Files.lines over big.log (5,000,000,069 bytes)
lines=34,120,522 errors=681,844 services=20
elapsed 9.4 s
heap: -Xmx=64 MiB, peak used (sampled every 20 ms)=38 MiB, GC collections=222, GC time=200 ms
GC log: 223 lines, 222 young pauses, 0 full GCs
first lines of the GC log:
[0.004s][info][gc] Using G1
[0.321s][info][gc] GC(0) Pause Young (Normal) (G1 Evacuation Pause) 15M->1M(64M) 7.040ms
[0.440s][info][gc] GC(1) Pause Young (Normal) (G1 Evacuation Pause) 28M->1M(64M) 1.218ms
[0.497s][info][gc] GC(2) Pause Young (Normal) (G1 Evacuation Pause) 38M->1M(64M) 1.372ms
last lines of the GC log:
[9.358s][info][gc] GC(219) Pause Young (Normal) (G1 Evacuation Pause) 38M->1M(64M) 0.696ms
[9.396s][info][gc] GC(220) Pause Young (Normal) (G1 Evacuation Pause) 38M->1M(64M) 0.466ms
[9.430s][info][gc] GC(221) Pause Young (Normal) (G1 Evacuation Pause) 38M->1M(64M) 0.497ms
largest 'Pause Young' (ms): 7.040
highest heap-after-GC seen in the log: 1M of 64M