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"measurement_kind": "matched_parameters", "audit_notes": [ "本次是普通 write 与单块 Session 的同参数对照，没有重新寻优。吞吐和各延时指标使用同一构造配置。", "同缓存的两份报告共享本次实测的开源对照数据；没有使用历史成绩。", "每层数据池严格为 8 MiB；原生队列的保留槽与 rigtorp 首尾 padding 纳入这个 payload 存储预算，队列元数据和输入另计。", "Session 正常遇到块满返回 insufficient_space，次数记入 session_block_exhaustions；这不是背压或丢消息。池/队列受压通过 Writer 内部压力统计报告。", "rigtorp_write_prefetch 在完整参数中记录；开关在测试开始前选择模板，普通复制和带提示构造都只复制一次完整负载，不额外写零。atomic_queue 保持原有调用。", "ReaderWriterQueue 16/32 B 使用 copy_after_zero：队列槽位默认清零后 memcpy 一次完整负载；8/64 B 保留成员复制。清零和复制均在写入计时内。各实现的调用端优化在行标签和完整参数中公开，不能把所有差异归因于队列算法。", "get_current_session → 内层逐条写 → 空间不足退出 → 外层 get_next_session。获取、等待、换块与 Session 状态归还包含在写入计时中。分组延时跨块继续计时，没有在块边界提前结束计时组。", "不主动 flush；flush 只发布位置，不切换 block。每轮尾部在计时外 finish_block，最后一轮 finish，关闭 current 扫描也能收齐尾部。", "本轮全部重新测量于提交 f698f25：只取消测试框架六个 lambda 的强制内联，Writer::write 的内联和库代码保持原样。8 B 回退的对照、历史源码与结论边界见 docs/performance_data/twobufqueue_8b_regression_20261011；本轮没有使用历史成绩替换。", "本轮合计 400 次独立正式测量、40 次完整负载/FIFO 校验、45 次回调校准；同缓存的普通 write 与 Session 共享本轮开源数据，因此四份报告显示的运行次数不可直接相加。" ], "copy_sensitivity": { "groups": [ { "label": "readerwriterqueue_8", "member_init": { "p50_runs_ns": [ 1.29166666667, 1.29166666667, 1.29166666667, 1.29166666667, 1.29166666667 ], "p50_ns": 1.29166666667 }, "body_memcpy": { "p50_runs_ns": [ 2.125, 2.45833333333, 2.125, 2.125, 2.125 ], "p50_ns": 2.191666666666 } }, { "label": "rigtorp_8", "member_init": { "p50_runs_ns": [ 22.7916666667, 22.375, 22.5, 21.6666666667, 21.1666666667 ], "p50_ns": 22.10000000002 }, "body_memcpy": { "p50_runs_ns": [ 2.625, 2.625, 2.625, 2.625, 2.625 ], "p50_ns": 2.625 } }, { "label": "atomic_queue_8", "member_init": { "p50_runs_ns": [ 4.83333333333, 5.29166666667, 5.54166666667, 5.375, 6.125 ], "p50_ns": 5.433333333334 }, "body_memcpy": { "p50_runs_ns": [ 5.5, 5.5, 5.20833333333, 5.25, 5.91666666667 ], "p50_ns": 5.475 } }, { "label": "readerwriterqueue_16", "member_init": { "p50_runs_ns": [ 9.70833333333, 9.16666666667, 9.33333333333, 9.20833333333, 9.58333333333 ], 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1.66666666667, 1.66666666667 ], "p50_ns": 1.6750000000020002 } }, { "label": "rigtorp_32", "member_init": { "p50_runs_ns": [ 23.6666666667, 23.5, 23.8333333333, 23.375, 23.0833333333 ], "p50_ns": 23.491666666660002 }, "body_memcpy": { "p50_runs_ns": [ 3.20833333333, 3.25, 3.25, 3.25, 3.20833333333 ], "p50_ns": 3.233333333332 } }, { "label": "atomic_queue_32", "member_init": { "p50_runs_ns": [ 8.04166666667, 8.33333333333, 8.20833333333, 8.375, 9.29166666667 ], "p50_ns": 8.45 }, "body_memcpy": { "p50_runs_ns": [ 8.41666666667, 8.375, 10.0833333333, 8.16666666667, 8.29166666667 ], "p50_ns": 8.666666666662 } }, { "label": "readerwriterqueue_64", "member_init": { "p50_runs_ns": [ 2.875, 2.95833333333, 2.95833333333, 2.83333333333, 3.20833333333 ], "p50_ns": 2.966666666664 }, "body_memcpy": { "p50_runs_ns": [ 3.375, 4.125, 3.25, 3.375, 3.375 ], "p50_ns": 3.5 } }, { "label": "rigtorp_64", "member_init": { "p50_runs_ns": [ 20.4166666667, 20.9583333333, 21.1666666667, 21.2916666667, 21.0833333333 ], "p50_ns": 20.98333333334 }, "body_memcpy": { "p50_runs_ns": [ 4.29166666667, 4.29166666667, 4.375, 4.33333333333, 4.29166666667 ], "p50_ns": 4.3166666666680005 } }, { "label": "atomic_queue_64", "member_init": { "p50_runs_ns": [ 10.5, 10.375, 11.5833333333, 10.5, 10.375 ], "p50_ns": 10.666666666660001 }, "body_memcpy": { "p50_runs_ns": [ 10.3333333333, 10.1666666667, 10.25, 10.7083333333, 11.5 ], "p50_ns": 10.59166666666 } } ], "validation_runs": 24, "formal_runs": 120, "binary_sha256": { "member_init": "3dfbaca5d43d9f4780ff48b0528ec85440308d25d5a81898d0acc2f7d356fbf4", "body_memcpy": "56c3e9572a28a2deff8b57704e57dfc1ac62579492dca00af78fbe237ffe71a8" }, "source_data": "/Users/lc/Documents/TwoBufQueue/docs/performance_data/release_20261011", "change": "Only external Payload copy constructor differs. All timing/data/allocation/scheduling/queue code unchanged.", "timestamp": "2026-10-11T00:16:44.565737+08:00", "data_directory": "copy_sensitivity_20261011", "upstream_headers_unchanged": true, "source_baseline": "../release_20261011/source.tar.gz", "interpretation": "Changing only the external copy constructor changes these measured results. The exact processor/compiler mechanism has not been established; these differences are not evidence of a queue algorithm advantage.", "defaulted_copy_constructor_validation": "defaulted-validation.json", "library_sha256": "f3718d0df946c322ee658073f4e9924c0c3a18b4e45b70cefed5a2bd9fdef524", "source_prefix": "performance_data/copy_sensitivity_20261011" } }