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TCP Local Performance

Measurements come from independent local Release loopback processes, not CI.

Metric definitions and methodology.

Average process CPU uses 100% for one logical CPU and can exceed 100% with multiple threads; estimated values are labeled, and incomplete sets of three CPU samples show N/A. On this 14-logical-CPU host, machine share = process CPU% / 14; 100% of one CPU is 7.14% of the machine.

No added computation

Throughput

p99 RTT

All Measured Profiles

64 B / 1 clients / window=1

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 59,430 [59,390, 60,057] 7.25 16.67 19.79 26.00 73.9 (estimated) 7.06
Boost.Asio / 4 contexts / 4 threads 59,362 [59,244, 60,179] 7.25 16.67 20.00 25.67 73.5 (estimated) 7.12
Boost.Asio / 1 context / 1 thread 51,897 [44,622, 56,008] 6.34 18.79 22.25 29.21 72.6 (estimated) 7.00
Boost.Asio / 1 context / 2 threads 52,792 [51,693, 53,166] 6.44 18.38 24.33 32.00 107.7 (estimated) 7.02
Boost.Asio / 1 context / 4 threads 43,604 [43,604, 44,905] 5.32 21.92 29.96 42.46 172.1 (estimated) 7.06
Standalone Asio / 2 contexts / 2 threads 58,602 [58,445, 60,258] 7.15 16.75 19.17 23.29 73.3 (estimated) 7.47
Standalone Asio / 4 contexts / 4 threads 58,603 [56,473, 59,790] 7.15 16.71 19.17 22.92 72.7 (estimated) 7.48
Standalone Asio / 1 context / 1 thread 54,344 [54,173, 54,487] 6.63 18.12 22.25 23.46 72.7 (estimated) 7.42
Standalone Asio / 1 context / 2 threads 52,192 [52,156, 52,975] 6.37 18.96 23.96 26.17 106.6 (estimated) 7.39
Standalone Asio / 1 context / 4 threads 44,675 [42,729, 44,875] 5.45 21.83 27.96 38.50 172.3 (estimated) 7.48

1024 B / 1 clients / window=1

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 57,741 [56,127, 57,808] 112.78 15.88 21.42 27.33 82.0 (estimated) 7.03
Boost.Asio / 4 contexts / 4 threads 57,639 [56,429, 57,907] 112.58 15.92 21.29 26.25 82.0 (estimated) 7.14
Boost.Asio / 1 context / 1 thread 54,386 [53,166, 54,864] 106.22 17.33 22.25 27.42 75.5 (estimated) 7.03
Boost.Asio / 1 context / 2 threads 49,739 [47,909, 50,131] 97.15 19.00 24.08 29.75 108.2 (estimated) 7.05
Boost.Asio / 1 context / 4 threads 41,420 [41,121, 42,935] 80.90 22.62 30.75 45.00 163.7 (estimated) 7.06
Standalone Asio / 2 contexts / 2 threads 54,414 [54,006, 56,483] 106.28 16.46 22.04 25.17 82.0 (estimated) 7.41
Standalone Asio / 4 contexts / 4 threads 55,325 [54,331, 61,146] 108.06 16.42 22.08 24.92 82.1 (estimated) 7.52
Standalone Asio / 1 context / 1 thread 56,877 [55,526, 58,685] 111.09 15.33 21.83 24.12 73.5 (estimated) 7.44
Standalone Asio / 1 context / 2 threads 47,400 [46,566, 48,509] 92.58 19.54 26.33 41.00 107.3 (estimated) 7.48
Standalone Asio / 1 context / 4 threads 42,972 [42,858, 43,126] 83.93 22.25 27.17 34.92 165.6 (estimated) 7.48

16384 B / 1 clients / window=1

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 29,424 [29,363, 29,453] 919.49 23.62 28.88 37.88 96.7 (estimated) 7.20
Boost.Asio / 4 contexts / 4 threads 29,454 [29,289, 29,662] 920.44 23.67 28.67 37.12 96.8 (estimated) 7.25
Boost.Asio / 1 context / 1 thread 29,949 [29,805, 30,202] 935.89 23.42 27.21 30.83 83.5 (estimated) 7.14
Boost.Asio / 1 context / 2 threads 28,812 [26,266, 29,027] 900.39 23.58 28.17 37.75 107.3 (estimated) 7.19
Boost.Asio / 1 context / 4 threads 26,419 [26,413, 26,832] 825.58 25.92 32.67 46.04 125.5 (estimated) 7.25
Standalone Asio / 2 contexts / 2 threads 29,531 [29,444, 29,922] 922.83 21.58 27.38 30.62 96.9 (estimated) 7.64
Standalone Asio / 4 contexts / 4 threads 29,849 [29,647, 30,048] 932.79 22.96 26.96 29.08 97.5 (estimated) 7.69
Standalone Asio / 1 context / 1 thread 30,386 [30,376, 30,458] 949.57 22.96 26.00 28.75 83.9 (estimated) 7.59
Standalone Asio / 1 context / 2 threads 28,987 [28,353, 29,073] 905.84 23.58 26.46 29.96 107.0 (estimated) 7.61
Standalone Asio / 1 context / 4 threads 26,615 [26,448, 26,686] 831.72 26.00 30.62 34.92 125.6 (estimated) 7.69

64 B / 16 clients / window=16

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 353,751 [332,547, 385,945] 43.18 630.50 1,386.21 1,645.96 198.3 (estimated) 7.75
Boost.Asio / 4 contexts / 4 threads 337,371 [316,652, 378,249] 41.18 723.42 1,175.12 1,306.62 386.7 (estimated) 8.06
Boost.Asio / 1 context / 1 thread 206,555 [186,590, 220,080] 25.21 1,143.38 1,292.00 1,400.50 92.6 (estimated) 7.67
Boost.Asio / 1 context / 2 threads 269,589 [265,087, 279,678] 32.91 924.92 1,115.54 1,247.21 190.4 (estimated) 7.75
Boost.Asio / 1 context / 4 threads 270,820 [252,850, 278,262] 33.06 937.71 1,198.58 1,373.25 347.6 (estimated) 7.78
Standalone Asio / 2 contexts / 2 threads 394,247 [380,536, 405,659] 48.13 628.96 707.25 829.88 198.7 (estimated) 8.12
Standalone Asio / 4 contexts / 4 threads 366,652 [330,421, 386,971] 44.76 603.96 1,024.42 1,288.08 388.5 (estimated) 8.44
Standalone Asio / 1 context / 1 thread 217,308 [212,278, 219,504] 26.53 1,156.62 1,274.71 1,315.58 93.6 (estimated) 8.11
Standalone Asio / 1 context / 2 threads 285,174 [283,238, 288,514] 34.81 883.83 947.75 1,121.67 193.7 (estimated) 8.11
Standalone Asio / 1 context / 4 threads 288,163 [276,394, 293,016] 35.18 873.54 1,088.08 1,160.21 350.3 (estimated) 8.22

1024 B / 16 clients / window=16

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 244,553 [222,067, 292,123] 477.64 880.25 1,998.96 2,143.50 198.0 (estimated) 8.42
Boost.Asio / 4 contexts / 4 threads 318,860 [303,099, 358,789] 622.77 780.79 1,296.62 1,355.54 386.1 (estimated) 9.22
Boost.Asio / 1 context / 1 thread 180,045 [172,130, 183,104] 351.65 1,383.71 1,869.00 2,115.67 98.3 (estimated) 8.42
Boost.Asio / 1 context / 2 threads 228,518 [218,598, 238,567] 446.32 1,084.58 1,354.42 1,563.54 192.1 (estimated) 8.39
Boost.Asio / 1 context / 4 threads 249,081 [245,620, 266,010] 486.49 996.83 1,317.00 1,503.62 356.9 (estimated) 8.52
Standalone Asio / 2 contexts / 2 threads 279,356 [267,876, 293,718] 545.62 866.33 1,225.62 1,921.58 198.9 (estimated) 8.88
Standalone Asio / 4 contexts / 4 threads 367,535 [339,487, 384,398] 717.84 555.17 1,248.25 1,346.00 383.4 (estimated) 10.52
Standalone Asio / 1 context / 1 thread 185,779 [182,846, 199,625] 362.85 1,357.42 1,470.71 1,491.79 97.2 (estimated) 8.80
Standalone Asio / 1 context / 2 threads 242,684 [242,348, 246,017] 473.99 1,033.83 1,113.62 1,255.75 195.7 (estimated) 8.80
Standalone Asio / 1 context / 4 threads 269,311 [263,372, 271,047] 526.00 904.92 1,218.21 1,268.12 360.5 (estimated) 8.86

16384 B / 16 clients / window=16

Dependency / model Round trips/s MiB/s p50 / us p95 / us p99 / us CPU / % RSS / MiB
Boost.Asio / 2 contexts / 2 threads 96,161 [95,965, 104,362] 3,005.03 2,482.12 3,397.50 3,679.67 198.2 (estimated) 20.25
Boost.Asio / 4 contexts / 4 threads 148,025 [147,285, 148,683] 4,625.78 1,717.62 2,070.46 2,115.83 395.6 (estimated) 20.53
Boost.Asio / 1 context / 1 thread 48,945 [48,371, 49,648] 1,529.53 5,209.58 5,369.21 5,476.25 96.4 (estimated) 20.17
Boost.Asio / 1 context / 2 threads 94,887 [92,178, 101,487] 2,965.21 2,605.42 3,078.71 3,396.25 197.2 (estimated) 20.38
Boost.Asio / 1 context / 4 threads 146,104 [141,990, 159,259] 4,565.75 1,662.62 2,231.62 2,517.04 386.1 (estimated) 20.42
Standalone Asio / 2 contexts / 2 threads 103,133 [100,600, 103,868] 3,222.89 2,426.38 2,545.00 3,439.38 198.3 (estimated) 20.69
Standalone Asio / 4 contexts / 4 threads 152,527 [151,687, 153,073] 4,766.46 1,596.12 2,085.83 2,140.21 393.9 (estimated) 29.03
Standalone Asio / 1 context / 1 thread 51,629 [48,682, 51,653] 1,613.40 4,953.25 5,028.42 5,122.96 100.0 (estimated) 20.67
Standalone Asio / 1 context / 2 threads 100,397 [97,068, 101,140] 3,137.40 2,511.00 2,765.21 3,189.75 197.7 (estimated) 20.62
Standalone Asio / 1 context / 4 threads 154,490 [153,953, 160,717] 4,827.80 1,583.00 2,191.58 2,474.79 389.5 (estimated) 20.64

Tables show repeated-run medians; throughput brackets show min/max, not confidence intervals. Latencies are medians of per-run sampled percentiles, without pooling samples.

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