docs(audits): profile parallel stat batch size effectiveness (#1083)#3906
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Capture the current per-operation parallel-stat thresholds, frame
the question of whether 64 still fits NFS/FUSE round-trip costs,
lay out a {16,64,256,1024,4096} x {100,1K,10K,100K} profiling
matrix across tmpfs/xfs/NFS/FUSE, and enumerate decision branches
(keep / runtime knob / statfs-aware) plus warmup, work-stealing,
NFS overload, and noise risks.
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May 18, 2026
…3906) Capture the current per-operation parallel-stat thresholds, frame the question of whether 64 still fits NFS/FUSE round-trip costs, lay out a {16,64,256,1024,4096} x {100,1K,10K,100K} profiling matrix across tmpfs/xfs/NFS/FUSE, and enumerate decision branches (keep / runtime knob / statfs-aware) plus warmup, work-stealing, NFS overload, and noise risks.
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Summary
DEFAULT_STAT_THRESHOLD = 64plus signature/metadata/deletion siblings) and where they dispatch viamap_blocking.64is the right cutover when NFS/FUSE/SMB stats cost 100x-1000x more than local tmpfs/xfs.statfs) and risks (rayon warmup on short transfers, work-stealing imbalance on skewed dirs, NFS server overload, heterogeneous workspaces, hyperfine noise on tmpfs).Closes #1083 once the follow-up profiling patch lands; this PR is the audit only.
Test plan
wc -l docs/audits/parallel-stat-batch-size-profile.md< 130.