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_o256_goodput.json
+++ b/analysis/crossover/d2_o256_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": 301.78380814404227,
+      "amplification": 1.0068138369093473,
+      "ttft": {
+        "count": 3552,
+        "mean": 0.14506312318632342,
+        "p50": 0.14291562204016373,
+        "p90": 0.1491016250802204,
+        "p99": 0.1832571337954128
+      },
+      "tpot": {
+        "count": 3552,
+        "mean": 0.0089611879488046,
+        "p50": 0.008925844482420122,
+        "p90": 0.010698060123752072,
+        "p99": 0.011754058378410762
+      },
+      "e2e": {
+        "count": 3552,
+        "mean": 2.430673889741114,
+        "p50": 2.419925262918696,
+        "p90": 2.874893436266575,
+        "p99": 3.1480205075151746
+      }
+    },
+    "4P+4D": {
+      "name": "4P+4D",
+      "n_offered": 3552,
+      "n_success": 3551,
+      "completion_rate": 0.9997184684684685,
+      "offered_window_s": 299.74141899999995,
+      "offered_qps": 11.850214134070008,
+      "wall_clock_s": 744.8868488909211,
+      "amplification": 2.4850981601942745,
+      "ttft": {
+        "count": 3551,
+        "mean": 0.20500909556101396,
+        "p50": 0.20017725799698383,
+        "p90": 0.21613375598099083,
+        "p99": 0.29023518750909716
+      },
+      "tpot": {
+        "count": 3551,
+        "mean": 0.010307210080394247,
+        "p50": 0.010299421709450874,
+        "p90": 0.011793581666607482,
+        "p99": 0.012639003840969035
+      },
+      "e2e": {
+        "count": 3551,
+        "mean": 2.8339171693501317,
+        "p50": 2.8360355379991233,
+        "p90": 3.2198793930001557,
+        "p99": 3.438588996999897
+      }
+    },
+    "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": 303.4300506779691,
+      "amplification": 1.0123060459587976,
+      "ttft": {
+        "count": 3552,
+        "mean": 0.2333820717117756,
+        "p50": 0.23283391550648957,
+        "p90": 0.24394672318594532,
+        "p99": 0.2734717815916518
+      },
+      "tpot": {
+        "count": 3552,
+        "mean": 0.016453822599812207,
+        "p50": 0.016576926972415737,
+        "p90": 0.017214638463623238,
+        "p99": 0.01769411424845092
+      },
+      "e2e": {
+        "count": 3552,
+        "mean": 4.430368151474328,
+        "p50": 4.463736370031256,
+        "p90": 4.628522685484495,
+        "p99": 4.75812664218829
+      }
+    }
+  },
+  "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": 0.9997184684684685,
+          "pd_advantage": 0.9997184684684685,
+          "n_slo": 3551
+        },
+        "6P+2D": {
+          "attainment": 1.0,
+          "pd_advantage": 1.0,
+          "n_slo": 3552
+        }
+      }
+    }
+  ]
+}