[CI] Guard partition consumers against failed check-changes and degenerate fits (#31416)

2026-07-15 22:09:40 -07:00
parent 238448f4c8
commit 0b372d03de
2 changed files with 8 additions and 0 deletions
@@ -148,6 +148,11 @@ def compute_partitions(
        fit = fit_table.get(suite) or {}
        coeff = fit.get("coeff", 1.0)
        bias = fit.get("bias", 0.0)
+        # Defense in depth: a non-positive slope is regression noise (more
+        # work cannot reduce wall time), and its runaway intercept can push
+        # every shard budget negative. Fall back to the static estimate.
+        if coeff <= 0:
+            coeff, bias = 1.0, 0.0

        # Each shard pays `bias` once, so size >= coeff*total / (target-bias).
        if suite in _BASE_A_OVERRIDES: