PD-disagg crossover: regular synthetic trace + goodput sweep + figure

gen_synthetic_trace.py --mode regular: maximally-regular multi-turn trace (fixed prefix/delta/turns, constant arrivals, zero session skew) to isolate the structural PD cost (per-turn full-context transfer + P/D capacity split) from the skew/hot-pin artifact. analysis/crossover/: SLO-goodput PD_advantage sweeps bracketing the prefill<->decode bottleneck axis (D1 grow input -> prefill-bound; D2 grow output -> decode-bound). figs/crossover_pd_advantage.png shows the crossover (y=1) with the agentic operating region annotated. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-05-29 18:19:23 +08:00
parent 48ae72467a
commit 847f52f03b
15 changed files with 1776 additions and 2 deletions
--- a/analysis/crossover/d2_o128_goodput.json
+++ b/analysis/crossover/d2_o128_goodput.json
@@ -0,0 +1,121 @@
+{
+  "baseline": "8C-proxy",
+  "arms": {
+    "8C-proxy": {
+      "name": "8C-proxy",
+      "n_offered": 3552,
+      "n_success": 3552,
+      "completion_rate": 1.0,
+      "offered_window_s": 299.74141899999995,
+      "offered_qps": 11.850214134070008,
+      "wall_clock_s": 300.61600343801547,
+      "amplification": 1.0029177964157683,
+      "ttft": {
+        "count": 3552,
+        "mean": 0.139721406387908,
+        "p50": 0.13759525847854093,
+        "p90": 0.14188919204752892,
+        "p99": 0.17052793529117438
+      },
+      "tpot": {
+        "count": 3552,
+        "mean": 0.006496044329480822,
+        "p50": 0.006430442302898453,
+        "p90": 0.007889476366154117,
+        "p99": 0.009282101713493095
+      },
+      "e2e": {
+        "count": 3552,
+        "mean": 0.9651016481538636,
+        "p50": 0.9548319909954444,
+        "p90": 1.1440699087572284,
+        "p99": 1.3324073514551853
+      }
+    },
+    "4P+4D": {
+      "name": "4P+4D",
+      "n_offered": 3552,
+      "n_success": 3552,
+      "completion_rate": 1.0,
+      "offered_window_s": 299.74141899999995,
+      "offered_qps": 11.850214134070008,
+      "wall_clock_s": 300.7410873459885,
+      "amplification": 1.0033351024670651,
+      "ttft": {
+        "count": 3552,
+        "mean": 0.18467717330343286,
+        "p50": 0.1806962049449794,
+        "p90": 0.1929074571467936,
+        "p99": 0.2592483600333798
+      },
+      "tpot": {
+        "count": 3552,
+        "mean": 0.006980159784640828,
+        "p50": 0.006945047342387123,
+        "p90": 0.008164690015837552,
+        "p99": 0.009163911323187739
+      },
+      "e2e": {
+        "count": 3552,
+        "mean": 1.0715517728354285,
+        "p50": 1.063076548918616,
+        "p90": 1.2275727374362762,
+        "p99": 1.4021264237130526
+      }
+    },
+    "6P+2D": {
+      "name": "6P+2D",
+      "n_offered": 3552,
+      "n_success": 3552,
+      "completion_rate": 1.0,
+      "offered_window_s": 299.74141899999995,
+      "offered_qps": 11.850214134070008,
+      "wall_clock_s": 301.1243950970238,
+      "amplification": 1.004613897210595,
+      "ttft": {
+        "count": 3552,
+        "mean": 0.20078434001432569,
+        "p50": 0.19958186394069344,
+        "p90": 0.213167638995219,
+        "p99": 0.23225504373782313
+      },
+      "tpot": {
+        "count": 3552,
+        "mean": 0.010393430778126047,
+        "p50": 0.010396533917478015,
+        "p90": 0.012065167099743436,
+        "p99": 0.01323438493101344
+      },
+      "e2e": {
+        "count": 3552,
+        "mean": 1.5212831554822883,
+        "p50": 1.5218885459471494,
+        "p90": 1.7440477049094625,
+        "p99": 1.9191367691196497
+      }
+    }
+  },
+  "slo_grid": [
+    {
+      "ttft_slo_s": 2.0,
+      "tpot_slo_s": 0.05,
+      "arms": {
+        "8C-proxy": {
+          "attainment": 1.0,
+          "pd_advantage": 1.0,
+          "n_slo": 3552
+        },
+        "4P+4D": {
+          "attainment": 1.0,
+          "pd_advantage": 1.0,
+          "n_slo": 3552
+        },
+        "6P+2D": {
+          "attainment": 1.0,
+          "pd_advantage": 1.0,
+          "n_slo": 3552
+        }
+      }
+    }
+  ]
+}