Gahow Wang 4021f27ee2 feat(analysis): stratified latency / TTFT reporter
Implements docs/EVALUATION_PROTOCOL_ZH.md §1.3 (M3 fix):
headline numbers must be accompanied by stratified
breakdowns so reviewers can see which slice the gains
come from.

The script reads one or more request-metrics.jsonl files
and buckets rows along four orthogonal dimensions:
  - turn_id        : {1, 2-5, 6-20, 21+}
  - input_length   : {<=8K, 8K-64K, >64K}
  - overlap_ratio  : {<=0.3, 0.3-0.7, >0.7}
  - append_tokens  : {<=128, 128-1K, 1K-8K, >8K}

Per bucket: n, n_ok, err_pct, latency/ttft mean+p50+p90+p99.
Output is markdown by default, --json for machine read.

stdlib only — no pandas/numpy. Verified on a synthetic
5-row jsonl (turn=1 with one error correctly reports
33.3% err% on the bucket).

Why this script and not pandas:
  - the existing scripts/analysis/* are stdlib-only;
    keeping consistency
  - reviewers can run it on the artifact without
    pip-installing anything beyond pytest
  - speed irrelevant; runs in <1s on the largest existing
    sweep (4449 rows)

Usage shown in EVALUATION_PROTOCOL_ZH §3.
2026-05-12 23:57:13 +08:00
2026-04-24 12:17:40 +00:00

Agentic PD Hybrid

这个项目是在 SGLang xPyD 上做一个最小实验框架,用来判断:

面向 agentic coding workload 的 session-aware / KV-cache-aware P/D routing能不能降低端到端延迟。

更完整但仍然简洁的说明见 docs/PROJECT_OVERVIEW.md

当前做了什么

  • 启动单机 SGLang P/D 栈。
  • 回放 Ali coding agent trace并记录 request-level metrics。
  • 支持 defaultstickykv-aware 路由策略。
  • 支持 pd-disaggregationkvcache-centricpd-colo 对比。
  • 支持小 append、多轮 session 的 micro-benchmark trace。
  • 维护了基于 SGLang v0.5.10 的本地 patch放在 third_party/sglang

环境

统一使用 uv

uv sync

默认模型路径:

~/models/Qwen/Qwen3-Coder-30B-A3B-Instruct

当前主要测试环境是单机 8 GPU约束是 prefill + decode <= 8

常用命令

生成小 append trace

uv run agentic-pd-hybrid make-small-append-trace \
  --output outputs/smoke-hotcap-30k-1k-256.jsonl \
  --session-count 4 \
  --turns-per-session 3 \
  --initial-input-length 30000 \
  --append-input-length 1000 \
  --output-length 256

跑 live benchmark

uv run agentic-pd-hybrid benchmark-live \
  --trace outputs/micro-serveable-varturn-30k-1k-256-20260424T0756Z.jsonl \
  --output-root outputs/live-serveable-varturn-30k-1k-256-hotcap \
  --mechanism kvcache-centric \
  --policy kv-aware \
  --kvcache-admission-mode worker \
  --prefill-workers 1 \
  --decode-workers 1 \
  --prefill-gpu-ids 0 \
  --decode-gpu-ids 1 \
  --transfer-backend mooncake \
  --target-duration-s 2000 \
  --session-sample-rate 1.0 \
  --min-turns 2 \
  --time-scale 1 \
  --concurrency-limit 1000

只回放并写 metrics

uv run agentic-pd-hybrid replay \
  --trace path/to/trace.jsonl \
  --policy kv-aware \
  --mechanism pd-disaggregation \
  --router-url http://127.0.0.1:8000 \
  --output outputs/replay.jsonl

输出

每次 replay/benchmark 会写:

  • request metricsrequest-metrics.jsonl
  • 汇总结果:request-metrics.jsonl.summary.json

重点看:

  • E2E latency
  • TTFT / TPOT
  • execution mode
  • cached tokens
  • KV transfer blocks
  • error

维护约定

  • 项目代码改动:feat: / fix: / docs:
  • SGLang 改动:feat(sglang): ... / fix(sglang): ...
  • third_party/sglang 的基线是 clean SGLang v0.5.10 snapshot。
  • 不提交 outputs/、日志、__pycache__、虚拟环境。
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