Everything the #246 runner dogfood on this rig surfaced, in one PR:
- verify-stress STRESS_FAST=1 (opt-in; gates keep full mode): skips
probe 7's large fresh needles (near-duplicate the ladder's depths)
and caps the ceiling ladder at 2 rungs (~2/3 anchor + ceiling).
MEASURED on the identical vllm/dual boot: 861s -> 361s (-58%).
Depth coverage stays 4-anchor (bench probe 10K/90K + mid + ceiling).
- VRAM margin attribution: compose `count: all` (DeviceRequests
Count:-1) and VISIBLE_DEVICES=all now resolve as a DETERMINED
"all host GPUs" -- kills the spurious per-rung WARN on dual rigs.
- VRAM margin aggregation: MIN per-card free instead of sum. TP OOMs
on the first card to run out; the sum overstated dual margins ~2x
(906 MB reported where the honest figure was 453 MB). SEMANTIC
TIGHTENING: multi-GPU margin advisories now fire against the real
per-card floor. Ceiling test updated to the new contract.
- arch-ab: lean tier exports STRESS_FAST=1 (per-arm ~30 -> ~20 min);
margin advisory surfaced in the summary table + a mid-run "ladder
CLEAN, not a failure" note so first-time runners don't abort on the
rc=1 advisory; bundle print points at the #246 test thread.
Full scripts gate 65/65. The e4m3-below-sm_8.9 refusal is the prior
commit on this branch.
Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EfF565T9eSLaqGzidyJ1Pm
