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    "four resource anchors are not a dense capacity curve or established pressure knee",
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    "Resource WSS uses a fixed 512 MiB reference across modes, not measured native RAM; 128/640 MiB anchors also change retained bytes and final synchronization volume.",
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    "fc-system": {
      "configured_guest_memory_mib": 512,
      "configured_value_scope": "requested VM allocation; distinct from guest-visible MemTotal",
      "environments_reporting_memtotal": 57,
      "observed_ready_memtotal_kib": [
        454788
      ],
      "valid_environments": 57
    },
    "qemu": {
      "configured_guest_memory_mib": 512,
      "configured_value_scope": "requested VM allocation; distinct from guest-visible MemTotal",
      "environments_reporting_memtotal": 57,
      "observed_ready_memtotal_kib": [
        454616,
        454620
      ],
      "valid_environments": 57
    },
    "qemu-microvm": {
      "configured_guest_memory_mib": 512,
      "configured_value_scope": "requested VM allocation; distinct from guest-visible MemTotal",
      "environments_reporting_memtotal": 57,
      "observed_ready_memtotal_kib": [
        454776,
        454780,
        454784
      ],
      "valid_environments": 57
    },
    "vm": {
      "configured_guest_memory_mib": 512,
      "configured_value_scope": "requested VM allocation; distinct from guest-visible MemTotal",
      "environments_reporting_memtotal": 51,
      "observed_ready_memtotal_kib": [
        528412
      ],
      "valid_environments": 51
    },
    "vm-writeback": {
      "configured_guest_memory_mib": 512,
      "configured_value_scope": "requested VM allocation; distinct from guest-visible MemTotal",
      "environments_reporting_memtotal": 51,
      "observed_ready_memtotal_kib": [
        528412
      ],
      "valid_environments": 51
    }
  },
  "outputs": {
    "docs/overrides/assets/benchmarks/data/filesystem/layered-references/filesystem-layered-references-failures.csv": "34a68a634e6108c64d6940760b3a2a774f6dbedee0f20014f92ca82009c19f05",
    "docs/overrides/assets/benchmarks/data/filesystem/layered-references/filesystem-layered-references-levels.csv": "07ad518ca23da0fb6ded059d976ec05bd87bfc8816fa8a9de77d57c82881c9c2",
    "docs/overrides/assets/benchmarks/data/filesystem/layered-references/filesystem-layered-references-ready.csv": "cbeffc598a13e111ecb18687422ca11cf9f996cf6a02a3f80b8a627197bfbf70",
    "docs/overrides/assets/benchmarks/filesystem-layered-references/mechanism-relative-time.svg": "bb8957c9353ef4e50eb01b1cdc90b5f01676e9893b984eb27a734ad52ed68670",
    "docs/overrides/assets/benchmarks/filesystem-layered-references/resource-workers.svg": "7340f0fbfd7c81e458bf70eca154756278e24246811a920dac6c8cb2029f906f",
    "docs/overrides/assets/benchmarks/filesystem-layered-references/workflow-rounds.svg": "117638f81b71af2f1fa693282cd6e0e6c150caedc5af9e43de3575e1c771e14a",
    "docs/overrides/assets/benchmarks/filesystem-layered-references/write-request-size.svg": "774908087d746a86c3f993d237ff7a535fd51a8665b993b8f7024abe1e89a791"
  },
  "payload": {
    "sha256": "f1b6cae222648b3f53e380070537e1d30e8c2b7f3fb89e04dc2643569208d09e",
    "source_sha256": {
      "harness/workloads_v2_guest.rs": "d3f8227b3d5089e91ac0706fd795701ef1b309a3b0bbc49e7bf3af8abeeeb034",
      "harness/workloads_v2_scenarios.rs": "a239e72a5e59ad0463ed94760995105439e4babef13072a4218919141ce31893"
    }
  },
  "publisher_sha256": "829536dc37505f21a2dafe9e636113e56705040167354dc2fc1bdf552d5dfcd0",
  "reference_configuration": {
    "docker": {
      "actual_parent_limits": {
        "cpu.max": "200000 100000",
        "memory.max": "2147483648",
        "memory.swap.max": "0"
      },
      "cpu_placement": "affinity",
      "image_id": "sha256:8b6d6e292d94372efb800a2899c6366aa7f431786b2adcfd81da109339691110",
      "image_inspection_sha256": "576c8ca2d2326d2b19e9f1b1c0e2ae069207d1b5f9ef9ee3970a80271b05a090",
      "input": "same frozen fixture, read-only bind at workspace/input",
      "launcher_sha256": "ec153330c6ae597d7aa46b4adf0222ded7206889858305733c74a11030c29ec1",
      "launcher_source_sha256": "ef3dde7e512e7f21efd6b01da31668cad2c1f96333da2cf67833acd9af663da1",
      "limitation": "payload and daemon affinity 0,1; no delegated cpuset, so early runc CPU placement is not proven",
      "output": "container writable overlay2 layer; copied out after timing",
      "ready": "host pre-exec marker before docker start --attach; create/import excluded",
      "runtime_cgroup_observation": "host cgroup namespace; payload reports actual parent path once before exec",
      "setup_sha256": "89046758277a1c988890ef06881d5e81042b155f64b8284907d87e04480bb176",
      "storage_driver": "overlay2"
    },
    "fc-system": {
      "assets_summary": {
        "disk_sha256": {
          "root_disk": "7e4b07233e31830a0247df30c5574f7bcedfe6a3c1538b67e14cac8c6eaae47e",
          "work_disk": "26b017481e87276179e215ffbb7cf9cdc49ce55c9894af9826538b636dcfb61a"
        },
        "kernel_receipt_sha256": "44b030c46d08f3dde21a34376d607b83ce21fe20e30076b4ad247d5e01673b5d",
        "kernel_sha256": {
          "config": "4da2a11de221a1dc48381fc71b00b9edeecaf844da92623097b8bf4046e50aeb",
          "extractor": "f81eb1706b6be6fe452d6dfa019b8b3b06030e27316a64c5e16c267a40584126",
          "initrd": "488119c13a774037975d63ee69ac2b6ad39d4b81865b32bb637f57a5507e2f82",
          "kernel": "d72be984cd992176cb1cd19bd4b074372ee0be5e79b426dc506fbc49abdbc079",
          "provenance": "2c66bb6c29846a1db8438395b6119b5bef2c9fbd9180036dcc6aee64919f76a0",
          "vmlinuz": "3de692df9e8d14d8dc3c0d935ec4c04fbe9231d8bdc18aeda1b6f0e20c7a1d1c"
        },
        "manifest": {
          "files": 23,
          "sha256": "3d2990e4f1559f997700a5ba09bd7c4a8ff8235c4459783c3af94c5349058e93"
        },
        "minimal_init_sha256": {
          "init": "3c120bf8fff7accd6d465803322e7baeeaeaa5d92df403f102c9eacccce873cd",
          "init.c": "f020db152a0cca542dd4ae1eea92e9683a1926cfd71cae5c783e33639054653c"
        },
        "root_disk_bytes": 8589934592,
        "schema": 1,
        "work_disk_bytes": 8589934592
      },
      "device_cache": "Firecracker Writeback with flush enabled",
      "durability": "payload file/directory synchronization retained; normal work unmount/reboot-to-exit outside completion clock",
      "executor": "Firecracker",
      "guest_memory_mib": 512,
      "guest_vcpus": 2,
      "kernel": {
        "distribution": "Fedora 45",
        "origin": "official-distro-stock",
        "package": "kernel-core",
        "package_version": "7.2.11-300.fc45.x86_64",
        "pvisor_firmware": false,
        "source_url": "https://www.kernel.org/"
      },
      "network": "no network device",
      "runtime": {
        "sha256": "c41309a2452e05149c5183e867c4d34b9b8d07e2885673d465714e238ad57d98",
        "version": "Firecracker v1.13.1\n\n2026-10-25T12:53:39.737612364 [anonymous-instance:main] Firecracker exiting successfully. exit_code=0"
      },
      "storage": "private root and workspace ext4/virtio-blk; root remounted readonly; input readonly bind",
      "transport": "virtio-mmio",
      "userspace": "same frozen prepared tools and static payload; minimal PID1, no distro services"
    },
    "qemu": {
      "assets_summary": {
        "disk_sha256": {
          "root_disk": "7e4b07233e31830a0247df30c5574f7bcedfe6a3c1538b67e14cac8c6eaae47e",
          "work_disk": "26b017481e87276179e215ffbb7cf9cdc49ce55c9894af9826538b636dcfb61a"
        },
        "kernel_receipt_sha256": "44b030c46d08f3dde21a34376d607b83ce21fe20e30076b4ad247d5e01673b5d",
        "kernel_sha256": {
          "config": "4da2a11de221a1dc48381fc71b00b9edeecaf844da92623097b8bf4046e50aeb",
          "extractor": "f81eb1706b6be6fe452d6dfa019b8b3b06030e27316a64c5e16c267a40584126",
          "initrd": "488119c13a774037975d63ee69ac2b6ad39d4b81865b32bb637f57a5507e2f82",
          "kernel": "d72be984cd992176cb1cd19bd4b074372ee0be5e79b426dc506fbc49abdbc079",
          "provenance": "2c66bb6c29846a1db8438395b6119b5bef2c9fbd9180036dcc6aee64919f76a0",
          "vmlinuz": "3de692df9e8d14d8dc3c0d935ec4c04fbe9231d8bdc18aeda1b6f0e20c7a1d1c"
        },
        "manifest": {
          "files": 23,
          "sha256": "3d2990e4f1559f997700a5ba09bd7c4a8ff8235c4459783c3af94c5349058e93"
        },
        "minimal_init_sha256": {
          "init": "3c120bf8fff7accd6d465803322e7baeeaeaa5d92df403f102c9eacccce873cd",
          "init.c": "f020db152a0cca542dd4ae1eea92e9683a1926cfd71cae5c783e33639054653c"
        },
        "root_disk_bytes": 8589934592,
        "schema": 1,
        "work_disk_bytes": 8589934592
      },
      "boot_firmware": {
        "name": "bios-256k.bin",
        "sha256": "54b82a3188d542bb97f2623d2e947a41e5f5cd32c84bddb67c6819301975b7d4"
      },
      "device_cache": "QEMU cache=writeback with flush enabled",
      "durability": "payload file/directory synchronization retained; normal work unmount/reboot-to-exit outside completion clock",
      "executor": "QEMU q35",
      "guest_memory_mib": 512,
      "guest_vcpus": 2,
      "kernel": {
        "distribution": "Fedora 45",
        "origin": "official-distro-stock",
        "package": "kernel-core",
        "package_version": "7.2.11-300.fc45.x86_64",
        "pvisor_firmware": false,
        "source_url": "https://www.kernel.org/"
      },
      "network": "no network device",
      "runtime": {
        "sha256": "b3daaa0a3ff17a70357dc5ad51a0f045e93212f603383ab85681f152b488a1ad",
        "version": "QEMU emulator version 11.1.2 (qemu-11.1.2-1.fc45)\nCopyright (c) 2003-2026 Fabrice Bellard and the QEMU Project developers"
      },
      "storage": "private root and workspace ext4/virtio-blk; root remounted readonly; input readonly bind",
      "transport": "virtio-pci",
      "userspace": "same frozen prepared tools and static payload; minimal PID1, no distro services"
    },
    "qemu-microvm": {
      "assets_summary": {
        "disk_sha256": {
          "root_disk": "7e4b07233e31830a0247df30c5574f7bcedfe6a3c1538b67e14cac8c6eaae47e",
          "work_disk": "26b017481e87276179e215ffbb7cf9cdc49ce55c9894af9826538b636dcfb61a"
        },
        "kernel_receipt_sha256": "44b030c46d08f3dde21a34376d607b83ce21fe20e30076b4ad247d5e01673b5d",
        "kernel_sha256": {
          "config": "4da2a11de221a1dc48381fc71b00b9edeecaf844da92623097b8bf4046e50aeb",
          "extractor": "f81eb1706b6be6fe452d6dfa019b8b3b06030e27316a64c5e16c267a40584126",
          "initrd": "488119c13a774037975d63ee69ac2b6ad39d4b81865b32bb637f57a5507e2f82",
          "kernel": "d72be984cd992176cb1cd19bd4b074372ee0be5e79b426dc506fbc49abdbc079",
          "provenance": "2c66bb6c29846a1db8438395b6119b5bef2c9fbd9180036dcc6aee64919f76a0",
          "vmlinuz": "3de692df9e8d14d8dc3c0d935ec4c04fbe9231d8bdc18aeda1b6f0e20c7a1d1c"
        },
        "manifest": {
          "files": 23,
          "sha256": "3d2990e4f1559f997700a5ba09bd7c4a8ff8235c4459783c3af94c5349058e93"
        },
        "minimal_init_sha256": {
          "init": "3c120bf8fff7accd6d465803322e7baeeaeaa5d92df403f102c9eacccce873cd",
          "init.c": "f020db152a0cca542dd4ae1eea92e9683a1926cfd71cae5c783e33639054653c"
        },
        "root_disk_bytes": 8589934592,
        "schema": 1,
        "work_disk_bytes": 8589934592
      },
      "boot_firmware": {
        "name": "qboot.rom",
        "sha256": "9b9dfc6c25740d6225625570d71cab6805cc9216e68c8932e343266daaeb8c4b"
      },
      "device_cache": "QEMU cache=writeback with flush enabled",
      "durability": "payload file/directory synchronization retained; normal work unmount/reboot-to-exit outside completion clock",
      "executor": "QEMU microvm",
      "guest_memory_mib": 512,
      "guest_vcpus": 2,
      "kernel": {
        "distribution": "Fedora 45",
        "origin": "official-distro-stock",
        "package": "kernel-core",
        "package_version": "7.2.11-300.fc45.x86_64",
        "pvisor_firmware": false,
        "source_url": "https://www.kernel.org/"
      },
      "network": "no network device",
      "runtime": {
        "sha256": "b3daaa0a3ff17a70357dc5ad51a0f045e93212f603383ab85681f152b488a1ad",
        "version": "QEMU emulator version 11.1.2 (qemu-11.1.2-1.fc45)\nCopyright (c) 2003-2026 Fabrice Bellard and the QEMU Project developers"
      },
      "storage": "private root and workspace ext4/virtio-blk; root remounted readonly; input readonly bind",
      "transport": "virtio-mmio",
      "userspace": "same frozen prepared tools and static payload; minimal PID1, no distro services"
    }
  },
  "reference_runtime_observation": null,
  "resource_scale": "128/640 MiB WSS and 1 GiB logical writes at fixed 512 MiB reference; native/host have parent 2 GiB, not 512 MiB guest limit",
  "role": "user-facing",
  "sampling": {
    "aggregate_score": null,
    "comparison": "cross-mode descriptive levels; no paired causal speedup or confidence interval",
    "dependent_rounds_per_environment": 3,
    "estimator": "median of independent environment observations; sum three rounds inside each environment before the aggregate median",
    "failures": "all retained; no medians for an incomplete backend/case cell; no zero filling or replacement",
    "independent_environments_per_case_backend": 3,
    "ready": "launch to payload Ready before case setup; teardown excluded; per-case cohorts, primary M01 only",
    "sample_ids": [
      1,
      2,
      3
    ],
    "tails": "not measured; N3 environment means do not establish P95/P99",
    "task": "payload work plus declared final synchronization; setup, validation, startup and exit excluded"
  },
  "schema": 1,
  "scope": "fresh cross-mode layered filesystem cohort; 12 mechanisms, four resource anchors, three separate complete workflows",
  "source": {
    "artifacts": {
      "pvisor": "e99449c839a8ce9db58a902596196708d4168cd7e3ec6cc95fba44344b98c94f",
      "pvisor-guest": "18c651535e1c20bbefa0900a681f72d59bb278a0be569306db7741df8dda6276"
    },
    "build_profile": null,
    "build_receipt_sha256": "b7d2786b67433ae20f84fafbc0927b6456992f56865a0f7ba3dd19427bfc6e17",
    "head": "9e1b8f1543ed25e2c2fd9690e5d8cca7b2487d1f",
    "source_files": 1216,
    "source_hashes_sha256": "f245d76c7aa8d7f003bcb2e981f8acc23facc8bc9b695fdcfa8dbdd198a75d32"
  },
  "state": "partial",
  "timing": "Ready from common pre-exec launch marker; isolation harness preparation and exit excluded; completed=work+final_sync, setup/validation separate",
  "toolroot": {
    "installed": {
      "bench-artifacts/libkrunfw.so.5.6.2": "4291201e9d63335b35c37902b2d45b8f96bd7675bb53a56a597163f0623cf87e",
      "bench-artifacts/payload": "a66221031b8db246106f230f248ca009a7a1be5783222848625245ac3329ae20",
      "bench-artifacts/pvisor": "e99449c839a8ce9db58a902596196708d4168cd7e3ec6cc95fba44344b98c94f",
      "bench-artifacts/pvisor-guest": "18c651535e1c20bbefa0900a681f72d59bb278a0be569306db7741df8dda6276",
      "bench-artifacts/workload": "f1b6cae222648b3f53e380070537e1d30e8c2b7f3fb89e04dc2643569208d09e"
    },
    "prepared_tools": {
      "usr/bin/cc": "66317f5338535ded9ce9e2fc7b1c20d33bf96b7d6d1c35a71aa6dc309be3a57e",
      "usr/bin/git": "b2dc7e49a1e23c71158ac1afb4580c489e9a28d63a09b467a3cfb2f721f0557d",
      "usr/bin/python3": "8f9b3657aa73659bdee8d4ff9da604fba390870be227a8c626029c2402cb063c",
      "usr/libexec/gcc/x86_64-redhat-linux/16/cc1": "9e4e7c84c7f758410d68592b7d6e892a77909fa171f6949d07837647f210db30"
    },
    "receipt_sha256": "a139d551cecd241eed1727ffcb314a95757c70fdb4bf23f3a52b8c5bf784326c",
    "runtime_dependencies": {}
  },
  "validation": "guest round oracle, checked completion and independent host final retained-state oracle; physical overlay markers strictly interpreted",
  "vm_configuration": {
    "vm": {
      "dax": false,
      "dax_source": "product OverlayFS VM device path disables DAX",
      "environment": {
        "PVISOR_FS_PROFILE": "0",
        "PVISOR_STARTUP_PROFILE": "0",
        "PVISOR_STARTUP_TIMING": "0",
        "PVISOR_VM_FS_HOST_WRITEBACK": "0",
        "PVISOR_VM_FS_WRITEBACK": "0",
        "PYTHONDONTWRITEBYTECODE": "1",
        "PYTHONPYCACHEPREFIX": "/__pvisor_reference_no_pyc__",
        "RUST_LOG": "off"
      },
      "executor": "ordinary pvisor CLI VM",
      "firmware_binding": "static musl product embeds the selected source-built firmware",
      "guest_memory_mib": 512,
      "guest_vcpus": 2,
      "host_lifecycle": "fresh private Host per case/environment",
      "requested_guest_writeback": 0,
      "requested_host_writeback": 0,
      "rootfs_ownership": "ordinary directory; no immutable-generation claim"
    },
    "vm-writeback": {
      "dax": false,
      "dax_source": "product OverlayFS VM device path disables DAX",
      "environment": {
        "PVISOR_FS_PROFILE": "0",
        "PVISOR_STARTUP_PROFILE": "0",
        "PVISOR_STARTUP_TIMING": "0",
        "PVISOR_VM_FS_HOST_WRITEBACK": "0",
        "PVISOR_VM_FS_WRITEBACK": "1",
        "PYTHONDONTWRITEBYTECODE": "1",
        "PYTHONPYCACHEPREFIX": "/__pvisor_reference_no_pyc__",
        "RUST_LOG": "off"
      },
      "executor": "ordinary pvisor CLI VM",
      "firmware_binding": "static musl product embeds the selected source-built firmware",
      "guest_memory_mib": 512,
      "guest_vcpus": 2,
      "host_lifecycle": "fresh private Host per case/environment",
      "requested_guest_writeback": 1,
      "requested_host_writeback": 0,
      "rootfs_ownership": "ordinary directory; no immutable-generation claim"
    }
  }
}