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"本次没有重新寻优，吞吐和各延时指标使用同一构造配置。普通 write 与 Session 的读端/发布配置和测量轮次可能不同，不能当作同参数对照。", "只重新测量 normal 与三个开源对照；另一写模式的报告保持原样，没有把它的历史数据混入本轮主表。", "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。", "TwoBufQueue 8 B：is_scan_current=true, publish_count=10, 初始/最大扫描间隔=1000000/1000000 ns，最小等待=1 ms。", "TwoBufQueue 16 B：is_scan_current=true, publish_count=10, 初始/最大扫描间隔=1000000/1000000 ns，最小等待=1 ms。", "TwoBufQueue 32 B：is_scan_current=true, publish_count=10, 初始/最大扫描间隔=1000000/1000000 ns，最小等待=1 ms。", "TwoBufQueue 64 B：is_scan_current=true, publish_count=10, 初始/最大扫描间隔=1000000/1000000 ns，最小等待=1 ms。", "本轮只改变普通 write 的当前块扫描和发布参数；Session 的配置、报告和原始结果保持上一轮原样。三个开源对照本轮重新测量，未使用历史成绩替换。", "256 MiB 的 1/1/2/4 次回调循环沿用 release_20261011_inline_fixed_110024；8 MiB 仍为 0。本次合计 320 次正式测量、32 次独立完整负载/FIFO 校验，没有重新校准或寻优。", "测试框架增加 publish_count=10 的编译期 Writer 实例，并修正非 2 次幂发布次数的轮末自然发布对齐；未修改库 src/include 或第三方头文件。每轮少于 1000 条的尾部仍发送并记录，延时样本只统计完整的 1000 次写入组。" ], "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": 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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" } }