HF streaming measured on WSL2, 2026-10-02
Primary cases: 60; independent decoded-file audit: PASS
Validation checks: 402841
Failure scout retained: Parquet prefix read returned rows but did not exit before 180 s.
Corrected probe closes the iterator explicitly. Every primary process exited 0.
Server completed GET body totals exclude aborted responses. Actual server body writes and aborts remain in CSV/JSON.
No network measurement was made for the remote Hub cases; their server fields are inapplicable, not proof of zero WAN traffic.
Cache bytes are final regular file lengths, not Windows disk reclaimed or peak temporary allocation.

RSS summaries use ru_maxrss recorded in an atexit callback after explicit cleanup, including imports; separate 50 ms VmHWM samples remain in wrappers.
study format mode rows state n cache_bytes completed_GET_body_bytes first_row_s_median work_s_median atexit_RSS_KiB_median
http csv normal 1000 empty 3 158333048 78288901 1.238815 1.249373 223440
http csv normal 1000 reused 3 158333048 0 0.700854 0.711985 169600
http csv normal 200000 empty 3 158333048 78288901 1.289219 3.352689 287948
http csv normal 200000 reused 3 158333048 0 0.691590 2.703835 234284
http csv stream 1000 empty 3 0 5505024 0.728902 0.732360 182080
http csv stream 1000 reused 3 0 5505024 0.724199 0.727713 181840
http csv stream 200000 empty 3 0 83269637 0.719327 1.947205 254124
http csv stream 200000 reused 3 0 83269637 0.719158 1.927101 254292
http parquet normal 1000 empty 3 138152645 58908496 0.865510 0.876334 270608
http parquet normal 1000 reused 3 138152645 0 0.679327 0.689846 169464
http parquet normal 200000 empty 3 138152645 58908496 0.857820 2.891914 290764
http parquet normal 200000 reused 3 138152645 0 0.678714 2.729504 233720
http parquet stream 1000 empty 3 0 37773687 0.756917 0.767186 240692
http parquet stream 1000 reused 3 0 37773687 0.751641 0.763037 238844
http parquet stream 200000 empty 3 0 64282444 0.777140 3.119836 336160
http parquet stream 200000 reused 3 0 64282444 0.745746 2.982269 337812
hub csv normal 5 empty 3 7890 NA 2.122813 2.122955 157764
hub csv normal 5 reused 3 7890 NA 1.691775 1.691987 155956
hub csv stream 5 empty 3 2856 NA 2.154548 2.154591 156532
hub csv stream 5 reused 3 2856 NA 1.884750 1.884793 156680