GPT-6.1 Sol (effort default (no reasoning-effort override) · thinking on) on Consistent-hash ring with weighted virtual nodes and zone-aware replica placement
OGPT-6.1 Soldefault · thinking on · Codex CLI 0.163.0 (codex exec --json) · cloud · 2026-10-22 · by @bobsiopener
- Estimated cost
- $0.07
- Wall time
- 1m
- Human step-ins
- 0
- Outcome
- Pass
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Summary
Exact prompt
# Consistent-hash ring with weights and zone-aware replicas `ring.py` places cache keys on storage nodes. The draft uses the wrong hash, ignores weights and zones, and is slow. Rewrite it (Python 3 stdlib only) so that `Ring(nodes, vnodes=64)`, `Ring.owner(key)`, `Ring.replicas(key, n)` and `moves(old_ring, new_ring, keys)` behave exactly as below. ## Hashing 1. `H(s)` = the first 8 bytes of SHA-256 of the UTF-8 encoding of `s`, read as a big-endian unsigned integer. 2. `nodes` maps a node name to a dict with optional `weight` (number, default 1) and `zone` (string, default = the node's own name). `vnodes` must be an int >= 1, else `ValueError`; a negative weight is a `ValueError`. 3. A node gets `k = floor(vnodes * weight + 0.5)` virtual points, but at least 1 if weight > 0. A node with weight 0 gets none and does not exist for the ring. Point i (0 <= i < k) of node `name` is at position `H(f"{name}#{i}")`. 4. The ring is all points sorted by (position, node name, i). ## Lookups 5. `owner(key)`: the node of the first point whose position is **>= H(key)**; if none, wrap around to the first point. An empty ring raises `LookupError`. 6. `replicas(key, n)`: start at the point `owner` would use and walk the ring clockwise (wrapping) over every point once. Look at each **distinct** node the first time it is met: if its zone is not yet used by a chosen node, choose it; otherwise remember it as skipped. Stop as soon as n nodes are chosen. If the walk ends with fewer than n chosen, append skipped nodes in the order they were first met until there are n (or none are left). `n < 1` gives `[]`. The owner is always first. 7. `moves(old, new, keys)`: for every key in `keys` whose owner differs, count the pair `(old_owner, new_owner)`; return a dict of these counts with keys in sorted order. 8. **Speed:** with 60 nodes at vnodes=128, building the ring, 60,000 `owner` calls and 10,000 `replicas(key, 3)` calls must take under 10 seconds in total on our shared test box. ## Scoring Hidden check groups (partial credit = fraction passed; all must pass): `hash_and_points` (1, 3, 4: owners for 2,000 keys on small rings), `weights_rounding` (3: e.g. weight 0.5/0.0078/0, exact owners), `wraparound_and_errors` (2, 5), `replicas_zones` (6), `replicas_fallback` (6: fewer zones than n, n larger than node count), `moves_counts` (7: adding, removing, reweighting a node), `speed` (8).
Exact owners for thousands of keys require the stated hash, point naming, rounding of weights (minimum one point) and >= with wraparound; the replica walk with zone skipping and ordered fallback, plus a speed check that rules out linear scans. Original benchmark task written for usecaserank.com. Headless, offline run on a reproducible fixture. Cost shown is a list-price API-equivalent estimate (run on a ChatGPT subscription, not billed).
Success criteria: 1. hash_and_points 2. weights_rounding 3. wraparound_and_errors 4. replicas_zones 5. replicas_fallback 6. moves_counts 7. speed (< 10 s)
Setup notes: Use Case Scout batch8 case i09-consistent-hash-ring (offline fixture). Prepared with batch8/prepare.sh on the shared box; only TASK.md + starting files were copied to the agent machine, hidden key/tests stayed on the box. Prompt = TASK.md verbatim on stdin. Flags: --json -s workspace-write --skip-git-repo-check --ephemeral --ignore-user-config --ignore-rules -C <workdir>. Scored on the box with the scout's scorer: `python score.py WORKDIR KEYDIR`. Single run, no retries. User-level AGENTS.md (846 bytes, sha256 83ec4fe50da8) may have been in context; --ignore-user-config does not document excluding it. Serving model not confirmed: requested via -m; the event log does not echo the serving model id. Price source is secondary (pricing.json verification='secondary', https://www.actuia.com/en/news/ai-api-pricing-in-october-2026-050-to-50-for-output/), not an official OpenAI price page. Score: 7/7. Cost is an ESTIMATE: measured tokens x pricing.json list price (ChatGPT plan, nothing billed); input_tokens include cached reads; output_tokens include reasoning tokens. Tool calls 5 (2 failed, recovered). Single run.
Estimated cost List-price estimate; not actually billed.
Metrics
- Estimated cost
- $0.07
- Wall time
- 1m
- Human step-ins
- 0
- Turns
- 1
| Model | Input tok | Output tok | Cost |
|---|---|---|---|
| OGPT-6.1 Solopenai/gpt-6.1-soleffort default (no reasoning-effort override) · thinking on | 119,699 | 3,896 | $0.07 |
Reproduce this run
- Use the use case prompt on the use case page.
- Same setup: GPT-6.1 Sol (openai/gpt-6.1-sol, effort default (no reasoning-effort override) · thinking on) via
Codex CLI 0.163.0 (codex exec --json), cloud. - It counts as a success only if it meets every success criterion: 1. hash_and_points 2. weights_rounding 3. wraparound_and_errors 4. replicas_zones 5. replicas_fallback 6. moves_counts 7. speed (< 10 s)
- Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.
How runs are scored: Methodology.
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Automated checks
Trust 80% comes from these checks (how Trust % works).
- Run date is not in the future : passed
- Model is in the dated pricing table : passed
- Cost recomputed from tokens matches : passed
- Cached tokens are consistent : passed
- Output throughput is plausible : passed
- Autonomy matches step-ins : passed
- Step-ins do not exceed turns : passed
- Retries agree with first-try result : passed
- Evidence log SHA-256 matches : passed
- Evidence log is substantial : passed
Evidence log
{"type": "thread.started", "thread_id": "01a16459-31e6-76d1-b003-ed4933d5ee57"}
{"type": "turn.started"}
{"type": "item.completed", "item": {"id": "item_0", "type": "agent_message", "text": "I\u2019ll inspect `ring.py`, implement the specified behavior, and check correctness and speed.\n"}}
{"type": "item.started", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd && rg --files -g 'AGENTS.md' -g '*ring*' -g '*test*'\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd && rg --files -g 'AGENTS.md' -g '*ring*' -g '*test*'\"", "aggregated_output": "/home/bob/usecase-runs/batch/out/gpt-6.1-sol/200_i09/work\nring.py\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat ring.py'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat ring.py'", "aggregated_output": "\"\"\"Consistent-hash ring for our object cache. Spec: TASK.md. Draft: wrong in several ways.\"\"\"\nimport hashlib\ndef h(s): return int(hashlib.md5(s.encode()).hexdigest(), 16)\nclass Ring:\n def __init__(self, nodes, vnodes=64):\n self.pts = sorted((h(f\"{n}-{i}\"), n) for n in nodes for i in range(vnodes)); self.nodes = nodes\n def owner(self, key):\n p = h(key)\n for t, n in self.pts:\n if t > p: return n\n return self.pts[-1][1]\n def replicas(self, key, n):\n out = []\n for t, nm in self.pts:\n if nm not in out: out.append(nm)\n return out[:n]\ndef moves(old, new, keys):\n return {}\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc \"cat > ring.py <<'PY'\n\\\"\\\"\\\"Weighted consistent hashing with zone-aware replica selection.\\\"\\\"\\\"\n\nfrom bisect import bisect_left\nfrom collections import Counter\nfrom hashlib import sha256\nfrom math import floor\n\n\ndef h(s):\n \\\"\\\"\\\"Return the first 64 bits of the SHA-256 hash of a UTF-8 string.\\\"\\\"\\\"\n return int.from_bytes(sha256(s.encode(\\\"utf-8\\\")).digest()[:8], \\\"big\\\")\n\n\nclass Ring:\n def __init__(self, nodes, vnodes=64):\n if not isinstance(vnodes, int) or vnodes < 1:\n raise ValueError(\\\"vnodes must be an integer >= 1\\\")\n self.nodes = {}\n self.pts = []\n self._zones = {}\n for name, config in nodes.items():\n weight = config.get(\\\"weight\\\", 1)\n if weight < 0:\n raise ValueError(\\\"weight must be nonnegative\\\")\n if weight == 0:\n continue\n count = max(1, floor(vnodes * weight + 0.5))\n self.nodes[name] = dict(config)\n self._zones[name] = config.get(\\\"zone\\\", name)\n self.pts.extend((h(f\\\"{name}#{i}\\\"), name, i)\n for i in range(count))\n self.pts.sort()\n self._positions = [point[0] for point in self.pts]\n\n def _start(self, key):\n if not self.pts:\n raise LookupError(\\\"empty ring\\\")\n index = bisect_left(self._positions, h(key))\n return index if index < len(self.pts) else 0\n\n def owner(self, key):\n return self.pts[self._start(key)][1]\n\n def replicas(self, key, n):\n if n < 1:\n return []\n index = self._start(key)\n chosen = []\n skipped = []\n seen = set()\n used_zones = set()\n for _ in range(len(self.pts)):\n name = self.pts[index][1]\n if name not in seen:\n seen.add(name)\n zone = self._zones[name]\n if zone not in used_zones:\n chosen.append(name)\n used_zones.add(zone)\n if len(chosen) >= n:\n return chosen\n else:\n skipped.append(name)\n # Further points cannot introduce any more distinct nodes.\n if len(seen) == len(self.nodes):\n break\n index += 1\n if index == len(self.pts):\n index = 0\n chosen.extend(skipped[:max(0, n - len(chosen))])\n return chosen\n\n\ndef moves(old_ring, new_ring, keys):\n counts = Counter()\n for key in keys:\n old_owner = old_ring.owner(key)\n new_owner = new_ring.owner(key)\n if old_owner \"'!= new_owner:\n counts[old_owner, new_owner] += 1\n return dict(sorted(counts.items()))\nPY'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc \"cat > ring.py <<'PY'\n\\\"\\\"\\\"Weighted consistent hashing with zone-aware replica selection.\\\"\\\"\\\"\n\nfrom bisect import bisect_left\nfrom collections import Counter\nfrom hashlib import sha256\nfrom math import floor\n\n\ndef h(s):\n \\\"\\\"\\\"Return the first 64 bits of the SHA-256 hash of a UTF-8 string.\\\"\\\"\\\"\n return int.from_bytes(sha256(s.encode(\\\"utf-8\\\")).digest()[:8], \\\"big\\\")\n\n\nclass Ring:\n def __init__(self, nodes, vnodes=64):\n if not isinstance(vnodes, int) or vnodes < 1:\n raise ValueError(\\\"vnodes must be an integer >= 1\\\")\n self.nodes = {}\n self.pts = []\n self._zones = {}\n for name, config in nodes.items():\n weight = config.get(\\\"weight\\\", 1)\n if weight < 0:\n raise ValueError(\\\"weight must be nonnegative\\\")\n if weight == 0:\n continue\n count = max(1, floor(vnodes * weight + 0.5))\n self.nodes[name] = dict(config)\n self._zones[name] = config.get(\\\"zone\\\", name)\n self.pts.extend((h(f\\\"{name}#{i}\\\"), name, i)\n for i in range(count))\n self.pts.sort()\n self._positions = [point[0] for point in self.pts]\n\n def _start(self, key):\n if not self.pts:\n raise LookupError(\\\"empty ring\\\")\n index = bisect_left(self._positions, h(key))\n return index if index < len(self.pts) else 0\n\n def owner(self, key):\n return self.pts[self._start(key)][1]\n\n def replicas(self, key, n):\n if n < 1:\n return []\n index = self._start(key)\n chosen = []\n skipped = []\n seen = set()\n used_zones = set()\n for _ in range(len(self.pts)):\n name = self.pts[index][1]\n if name not in seen:\n seen.add(name)\n zone = self._zones[name]\n if zone not in used_zones:\n chosen.append(name)\n used_zones.add(zone)\n if len(chosen) >= n:\n return chosen\n else:\n skipped.append(name)\n # Further points cannot introduce any more distinct nodes.\n if len(seen) == len(self.nodes):\n break\n index += 1\n if index == len(self.pts):\n index = 0\n chosen.extend(skipped[:max(0, n - len(chosen))])\n return chosen\n\n\ndef moves(old_ring, new_ring, keys):\n counts = Counter()\n for key in keys:\n old_owner = old_ring.owner(key)\n new_owner = new_ring.owner(key)\n if old_owner \"'!= new_owner:\n counts[old_owner, new_owner] += 1\n return dict(sorted(counts.items()))\nPY'", "aggregated_output": "", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"python - <<'PY'\nimport hashlib, math, random, time\nfrom collections import Counter\nfrom unittest.mock import patch\nfrom ring import Ring, h, moves\n\ndef reference(nodes, vnodes, key, n):\n H = lambda s: int.from_bytes(hashlib.sha256(s.encode('utf-8')).digest()[:8], 'big')\n points = sorted((H(f'{name}#{i}'), name, i) for name, cfg in nodes.items() if cfg.get('weight', 1) > 0 for i in range(max(1, math.floor(vnodes * cfg.get('weight', 1) + .5))))\n start = next((i for i, p in enumerate(points) if p[0] >= H(key)), 0)\n order = list(dict.fromkeys(p[1] for p in points[start:] + points[:start]))\n chosen, skipped, zones = [], [], set()\n for name in order:\n zone = nodes[name].get('zone', name)\n if zone in zones:\n skipped.append(name)\n else:\n chosen.append(name)\n zones.add(zone)\n return order[0], (chosen + skipped)[:max(0, n)]\n\nrng = random.Random(42)\nfor trial in range(30):\n nodes = {f'node{i}': {'weight': rng.choice([0, .0078, .5, 1, 2]), 'zone': str(rng.randrange(3))} for i in range(8)}\n nodes['active'] = {}\n vnodes = rng.choice([1, 8, 64])\n ring = Ring(nodes, vnodes)\n for i in range(100):\n key = f'cl\u00e9-{trial}-{i}'\n n = rng.randrange(-2, 12)\n owner, replicas = reference(nodes, vnodes, key, n)\n assert ring.owner(key) == owner\n assert ring.replicas(key, n) == replicas\nfor value in [0, -1, 1.2, '64', None]:\n try: Ring({}, value)\n except ValueError: pass\n else: raise AssertionError(value)\ntry: Ring({'bad': {'weight': -1}})\nexcept ValueError: pass\nelse: raise AssertionError('negative weight')\nempty = Ring({'zero': {'weight': 0}})\nassert empty.replicas('x', 0) == []\nfor call in [lambda: empty.owner('x'), lambda: empty.replicas('x', 1)]:\n try: call()\n except LookupError: pass\n else: raise AssertionError('empty ring')\nwith patch('ring.h', side_effect=lambda s: {'a#0': 10, 'b#0': 10, 'equal': 10, 'wrap': 11}[s]):\n ring = Ring({'b': {}, 'a': {}}, 1)\n assert ring.owner('equal') == 'a'\n assert ring.owner('wrap') == 'a'\n assert ring.replicas('equal', 9) == ['a', 'b']\nold = Ring({'a': {}, 'b': {}, 'c': {}})\nkeys = [str(i % 200) for i in range(1000)]\nfor configs in [{'a': {}, 'b': {}, 'c': {}, 'd': {}}, {'a': {}, 'c': {}}, {'a': {'weight': .5}, 'b': {}, 'c': {}}]:\n new = Ring(configs)\n expected = Counter((old.owner(k), new.owner(k)) for k in keys if old.owner(k) \"'!= new.owner(k))\n actual = moves(old, new, iter(keys))\n assert actual == expected and list(actual) == sorted(actual)\nstart = time.perf_counter()\nring = Ring({f'\"'node{i}': {'zone': str(i % 3)} for i in range(60)}, 128)\nfor i in range(60000): ring.owner(str(i))\nfor i in range(10000): ring.replicas(str(i), 3)\nelapsed = time.perf_counter() - start\nassert elapsed < 10, elapsed\nprint(f'Passed 3,000 reference comparisons, edge cases, and moves checks. Benchmark: {elapsed:.3f}s.')\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"python - <<'PY'\nimport hashlib, math, random, time\nfrom collections import Counter\nfrom unittest.mock import patch\nfrom ring import Ring, h, moves\n\ndef reference(nodes, vnodes, key, n):\n H = lambda s: int.from_bytes(hashlib.sha256(s.encode('utf-8')).digest()[:8], 'big')\n points = sorted((H(f'{name}#{i}'), name, i) for name, cfg in nodes.items() if cfg.get('weight', 1) > 0 for i in range(max(1, math.floor(vnodes * cfg.get('weight', 1) + .5))))\n start = next((i for i, p in enumerate(points) if p[0] >= H(key)), 0)\n order = list(dict.fromkeys(p[1] for p in points[start:] + points[:start]))\n chosen, skipped, zones = [], [], set()\n for name in order:\n zone = nodes[name].get('zone', name)\n if zone in zones:\n skipped.append(name)\n else:\n chosen.append(name)\n zones.add(zone)\n return order[0], (chosen + skipped)[:max(0, n)]\n\nrng = random.Random(42)\nfor trial in range(30):\n nodes = {f'node{i}': {'weight': rng.choice([0, .0078, .5, 1, 2]), 'zone': str(rng.randrange(3))} for i in range(8)}\n nodes['active'] = {}\n vnodes = rng.choice([1, 8, 64])\n ring = Ring(nodes, vnodes)\n for i in range(100):\n key = f'cl\u00e9-{trial}-{i}'\n n = rng.randrange(-2, 12)\n owner, replicas = reference(nodes, vnodes, key, n)\n assert ring.owner(key) == owner\n assert ring.replicas(key, n) == replicas\nfor value in [0, -1, 1.2, '64', None]:\n try: Ring({}, value)\n except ValueError: pass\n else: raise AssertionError(value)\ntry: Ring({'bad': {'weight': -1}})\nexcept ValueError: pass\nelse: raise AssertionError('negative weight')\nempty = Ring({'zero': {'weight': 0}})\nassert empty.replicas('x', 0) == []\nfor call in [lambda: empty.owner('x'), lambda: empty.replicas('x', 1)]:\n try: call()\n except LookupError: pass\n else: raise AssertionError('empty ring')\nwith patch('ring.h', side_effect=lambda s: {'a#0': 10, 'b#0': 10, 'equal': 10, 'wrap': 11}[s]):\n ring = Ring({'b': {}, 'a': {}}, 1)\n assert ring.owner('equal') == 'a'\n assert ring.owner('wrap') == 'a'\n assert ring.replicas('equal', 9) == ['a', 'b']\nold = Ring({'a': {}, 'b': {}, 'c': {}})\nkeys = [str(i % 200) for i in range(1000)]\nfor configs in [{'a': {}, 'b': {}, 'c': {}, 'd': {}}, {'a': {}, 'c': {}}, {'a': {'weight': .5}, 'b': {}, 'c': {}}]:\n new = Ring(configs)\n expected = Counter((old.owner(k), new.owner(k)) for k in keys if old.owner(k) \"'!= new.owner(k))\n actual = moves(old, new, iter(keys))\n assert actual == expected and list(actual) == sorted(actual)\nstart = time.perf_counter()\nring = Ring({f'\"'node{i}': {'zone': str(i % 3)} for i in range(60)}, 128)\nfor i in range(60000): ring.owner(str(i))\nfor i in range(10000): ring.replicas(str(i), 3)\nelapsed = time.perf_counter() - start\nassert elapsed < 10, elapsed\nprint(f'Passed 3,000 reference comparisons, edge cases, and moves checks. Benchmark: {elapsed:.3f}s.')\nPY\"", "aggregated_output": "/bin/bash: line 1: python: command not found\n", "exit_code": 127, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport hashlib, math, random, time\nfrom collections import Counter\nfrom unittest.mock import patch\nfrom ring import Ring, moves\nrng = random.Random(42)\nH = lambda s: int.from_bytes(hashlib.sha256(s.encode()).digest()[:8], 'big')\nfor trial in range(30):\n nodes = {str(i): {'weight': rng.choice([0, .0078, .5, 1, 2]), 'zone': str(rng.randrange(3))} for i in range(8)}\n nodes['active'] = {}\n v = rng.choice([1, 8, 64])\n r = Ring(nodes, v)\n pts = sorted((H(f'{name}#{i}'), name, i) for name, c in nodes.items() if c.get('weight', 1) > 0 for i in range(max(1, math.floor(v*c.get('weight', 1)+.5))))\n assert r.pts == pts\n for j in range(100):\n key, n = f'cl\u00e9-{j}', rng.randrange(-2, 12)\n start = next((i for i, p in enumerate(pts) if p[0] >= H(key)), 0)\n order = list(dict.fromkeys(p[1] for p in pts[start:] + pts[:start]))\n chosen, skipped, zones = [], [], set()\n for name in order:\n zone = nodes[name].get('zone', name)\n if zone in zones: skipped.append(name)\n else: chosen.append(name); zones.add(zone)\n assert r.owner(key) == order[0]\n assert r.replicas(key, n) == (chosen + skipped)[:max(0, n)]\nfor v in [0, -1, 1.2, '64', None]:\n try: Ring({}, v)\n except ValueError: pass\n else: raise AssertionError(v)\ntry: Ring({'bad': {'weight': -1}})\nexcept ValueError: pass\nelse: raise AssertionError('negative')\nr = Ring({'zero': {'weight': 0}})\nassert r.replicas('x', 0) == []\nfor call in [lambda: r.owner('x'), lambda: r.replicas('x', 1)]:\n try: call()\n except LookupError: pass\n else: raise AssertionError('empty')\nwith patch('ring.h', side_effect=lambda s: {'a#0': 10, 'b#0': 10, 'equal': 10, 'wrap': 11}[s]):\n r = Ring({'b': {}, 'a': {}}, 1)\n assert r.owner('equal') == r.owner('wrap') == 'a'\n assert r.replicas('equal', 9) == ['a', 'b']\nold = Ring({'a': {}, 'b': {}, 'c': {}})\nkeys = [str(i % 200) for i in range(1000)]\nfor configs in [{'a': {}, 'b': {}, 'c': {}, 'd': {}}, {'a': {}, 'c': {}}, {'a': {'weight': .5}, 'b': {}, 'c': {}}]:\n new = Ring(configs)\n expected = Counter((old.owner(k), new.owner(k)) for k in keys if old.owner(k) \"'!= new.owner(k))\n actual = moves(old, new, iter(keys))\n assert actual == expected and list(actual) == sorted(actual)\nstart = time.perf_counter()\nr = Ring({str(i): {'\"'zone': str(i % 3)} for i in range(60)}, 128)\nfor i in range(60000): r.owner(str(i))\nfor i in range(10000): r.replicas(str(i), 3)\nelapsed = time.perf_counter() - start\nassert elapsed < 10\nprint(f'Passed 3,000 reference comparisons, edge cases, and moves checks. Benchmark: {elapsed:.3f}s.')\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport hashlib, math, random, time\nfrom collections import Counter\nfrom unittest.mock import patch\nfrom ring import Ring, moves\nrng = random.Random(42)\nH = lambda s: int.from_bytes(hashlib.sha256(s.encode()).digest()[:8], 'big')\nfor trial in range(30):\n nodes = {str(i): {'weight': rng.choice([0, .0078, .5, 1, 2]), 'zone': str(rng.randrange(3))} for i in range(8)}\n nodes['active'] = {}\n v = rng.choice([1, 8, 64])\n r = Ring(nodes, v)\n pts = sorted((H(f'{name}#{i}'), name, i) for name, c in nodes.items() if c.get('weight', 1) > 0 for i in range(max(1, math.floor(v*c.get('weight', 1)+.5))))\n assert r.pts == pts\n for j in range(100):\n key, n = f'cl\u00e9-{j}', rng.randrange(-2, 12)\n start = next((i for i, p in enumerate(pts) if p[0] >= H(key)), 0)\n order = list(dict.fromkeys(p[1] for p in pts[start:] + pts[:start]))\n chosen, skipped, zones = [], [], set()\n for name in order:\n zone = nodes[name].get('zone', name)\n if zone in zones: skipped.append(name)\n else: chosen.append(name); zones.add(zone)\n assert r.owner(key) == order[0]\n assert r.replicas(key, n) == (chosen + skipped)[:max(0, n)]\nfor v in [0, -1, 1.2, '64', None]:\n try: Ring({}, v)\n except ValueError: pass\n else: raise AssertionError(v)\ntry: Ring({'bad': {'weight': -1}})\nexcept ValueError: pass\nelse: raise AssertionError('negative')\nr = Ring({'zero': {'weight': 0}})\nassert r.replicas('x', 0) == []\nfor call in [lambda: r.owner('x'), lambda: r.replicas('x', 1)]:\n try: call()\n except LookupError: pass\n else: raise AssertionError('empty')\nwith patch('ring.h', side_effect=lambda s: {'a#0': 10, 'b#0': 10, 'equal': 10, 'wrap': 11}[s]):\n r = Ring({'b': {}, 'a': {}}, 1)\n assert r.owner('equal') == r.owner('wrap') == 'a'\n assert r.replicas('equal', 9) == ['a', 'b']\nold = Ring({'a': {}, 'b': {}, 'c': {}})\nkeys = [str(i % 200) for i in range(1000)]\nfor configs in [{'a': {}, 'b': {}, 'c': {}, 'd': {}}, {'a': {}, 'c': {}}, {'a': {'weight': .5}, 'b': {}, 'c': {}}]:\n new = Ring(configs)\n expected = Counter((old.owner(k), new.owner(k)) for k in keys if old.owner(k) \"'!= new.owner(k))\n actual = moves(old, new, iter(keys))\n assert actual == expected and list(actual) == sorted(actual)\nstart = time.perf_counter()\nr = Ring({str(i): {'\"'zone': str(i % 3)} for i in range(60)}, 128)\nfor i in range(60000): r.owner(str(i))\nfor i in range(10000): r.replicas(str(i), 3)\nelapsed = time.perf_counter() - start\nassert elapsed < 10\nprint(f'Passed 3,000 reference comparisons, edge cases, and moves checks. Benchmark: {elapsed:.3f}s.')\nPY\"", "aggregated_output": "Passed 3,000 reference comparisons, edge cases, and moves checks. Benchmark: 0.095s.\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_6", "type": "agent_message", "text": "Rewrote [ring.py](/home/bob/usecase-runs/batch/out/gpt-6.1-sol/200_i09/work/ring.py) with SHA-256 hashing, weighted points, binary-search lookups, zone-aware replicas, and sorted move counts.\n\nPassed 3,000 reference comparisons plus error, wraparound, collision, and moves checks. The requested benchmark completed in **0.095 seconds** locally."}}
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