dash_read_bounds: time the short and long runs in turn, the least of seven each #400
2026-10-21
dash_read_bounds: 1000 attributes against 32000, bound at 256 times
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Interleaving was not enough: the linux-arm64 runner failed it again at 40000 against 10000 (120 ms, 11 ms). Linear reading of the larger element costs up to about three times more per attribute when its sets leave a cache a busy host shares, which puts linear near 12 times and a quadratic reader at 16: too close to bound. With sizes 32 apart, linear is 32 times (about 100 with that cache effect) and quadratic about a thousand, and the bound sits between them. Co-Authored-By: Claude Opus 5.5 <[email protected]>
dash_read_bounds: time the short and long runs in turn, the least of seven each
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The linear-time check failed on a loaded linux-arm64 runner with both figures about ten times their usual size (10000 attributes 10.8 ms, 40000 181 ms): on a virtual machine a thread's CPU clock also counts the time the host held the virtual CPU, so a busy host slows every run of one size before the other is timed. Taking the two in turn lets a busy spell slow both alike, and seven runs each make the least of each the run it disturbed least. The bounds are unchanged: a reader that scans the names read so far still fails them. Co-Authored-By: Claude Opus 5.5 <[email protected]>