Record Frontier trace stalls without ranking them

runs/frontier-fidelity-envelope-v1/run_frontier_qwen30_exact_trace_surface.py

@@ -68,6 +68,7 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--allreduce-csv", type=Path)
     parser.add_argument("--timeout-seconds", type=float, default=1800.0)
     parser.add_argument("--resume", action="store_true")
+    parser.add_argument("--continue-on-failure", action="store_true")
     return parser.parse_args()
 
 
@@ -156,6 +157,12 @@ def trace_manifest_entry(trace: dict[str, Any]) -> dict[str, Any]:
     }
 
 
+def classify_frontier_failure(stderr: str) -> str:
+    if "Sequential simulation ended with non-empty scheduler state" in stderr:
+        return "scheduler_stall"
+    return "frontier_error"
+
+
 def score(path: Path, expected_shapes: list[tuple[int, int]]) -> dict[str, Any]:
     with path.open(newline="") as source:
         rows = list(csv.DictReader(source))
@@ -312,9 +319,48 @@ def main() -> None:
                     check=False,
                 )
             if completed.returncode != 0:
-                raise RuntimeError(
-                    f"Frontier failed for {config.name}/{trace['label']}: {completed.returncode}"
+                stderr_path = run_dir / "stderr.log"
+                result = {
+                    "status": "frontier_failed",
+                    "failure_kind": classify_frontier_failure(
+                        stderr_path.read_text(errors="replace")
+                    ),
+                    "returncode": completed.returncode,
+                    "config": {
+                        "tp": config.tp,
+                        "mns": config.mns,
+                        "name": config.name,
+                    },
+                    "trace_label": trace["label"],
+                    "offered_request_rate": trace["offered_request_rate"],
+                    "offered_request_rate_per_gpu": (
+                        trace["offered_request_rate"] / config.tp
+                    ),
+                    "request_count": trace["requests"],
+                    "elapsed_seconds": time.time() - started,
+                    "trace_sha256": trace["sha256"],
+                    "stderr_sha256": BASE.sha256(stderr_path),
+                }
+                BASE.write_json(result_path, result)
+                loads.append(result)
+                print(
+                    json.dumps(
+                        {
+                            "config": config.name,
+                            "trace": trace["label"],
+                            "status": result["status"],
+                            "failure_kind": result["failure_kind"],
+                        },
+                        sort_keys=True,
+                    ),
+                    flush=True,
                 )
+                if not args.continue_on_failure:
+                    raise RuntimeError(
+                        f"Frontier failed for {config.name}/{trace['label']}: "
+                        f"{completed.returncode}"
+                    )
+                continue
             metrics = find_request_metrics(run_dir)
             result = {
                 "status": "completed",
@@ -353,21 +399,38 @@ def main() -> None:
     for slo in (f"tpot_{int(value)}ms" for value in TPOT_SLOS_MS):
         records = []
         for item in config_results:
+            completed_loads = [
+                load for load in item["loads"] if load["status"] == "completed"
+            ]
+            invalid_loads = [
+                load for load in item["loads"] if load["status"] != "completed"
+            ]
             feasible = [
                 load["offered_request_rate"]
-                for load in item["loads"]
+                for load in completed_loads
                 if load["score"]["slos"][slo]["feasible"]
             ]
             capacity = max(feasible, default=None)
             records.append(
                 {
                     "config": item["config"],
+                    "ranking_valid": not invalid_loads,
+                    "invalid_loads": [
+                        {
+                            "trace_label": load["trace_label"],
+                            "failure_kind": load.get("failure_kind", "unknown"),
+                        }
+                        for load in invalid_loads
+                    ],
                     "maximum_tested_feasible_request_rate": capacity,
                     "maximum_tested_feasible_request_rate_per_gpu": (
                         capacity / item["config"]["tp"] if capacity is not None else None
                     ),
-                    "lower_censored": capacity is None,
-                    "upper_censored": capacity == traces[-1]["offered_request_rate"],
+                    "lower_censored": capacity is None and not invalid_loads,
+                    "upper_censored": (
+                        capacity == traces[-1]["offered_request_rate"]
+                        and not invalid_loads
+                    ),
                 }
             )
         records.sort(
@@ -382,9 +445,20 @@ def main() -> None:
         )
         rankings[slo] = records
 
+    has_invalid_cells = any(
+        load["status"] != "completed"
+        for item in config_results
+        for load in item["loads"]
+    )
+    if selected != list(BASE.GRID):
+        manifest_status = "partial_not_decision_bearing"
+    elif has_invalid_cells:
+        manifest_status = "frozen_with_invalid_cells"
+    else:
+        manifest_status = "frozen_before_real"
     manifest = {
         "schema": "frontier-qwen30-exact-trace-surface-v1",
-        "status": "frozen_before_real" if selected == list(BASE.GRID) else "partial_not_decision_bearing",
+        "status": manifest_status,
         "contract": {
             "window_seconds": (
                 WINDOW_SECONDS if args.rate_contract == "trace-window" else None

runs/frontier-fidelity-envelope-v1/test_fidelity_envelope.py

@@ -106,6 +106,16 @@ class FidelityEnvelopeTest(unittest.TestCase):
 
     def test_exact_trace_parser_and_joint_slo_score(self) -> None:
         module = load("run_frontier_qwen30_exact_trace_surface.py")
+        self.assertEqual(
+            module.classify_frontier_failure(
+                "Sequential simulation ended with non-empty scheduler state"
+            ),
+            "scheduler_stall",
+        )
+        self.assertEqual(
+            module.classify_frontier_failure("unexpected failure"),
+            "frontier_error",
+        )
         with tempfile.TemporaryDirectory() as temporary:
             root = Path(temporary)
             trace = root / "trace.csv"