sskj/BENCHMARK_WORKFLOW.md

Benchmark Workflow & Directory Conventions

Directory Layout

/data/user1/yy/
├── platforms/                  # chip/accelerator platform configs
│   ├── kunlun_p800.env
│   ├── nvidia_h200.env
│   └── patches/kunlun_p800/    # runtime patches required by some images
├── scripts/                    # shared benchmark/orchestrator/utility scripts
│   ├── common/                 # reusable components (lib.sh, platform.sh, ...)
│   ├── analysis/               # cross-experiment comparison tools
│   ├── benchmark_dspark_0707/  # legacy DSpark benchmark suite
│   └── ...
├── experiments/                # experiment-centric directories (preferred)
│   └── dsv4_p800_sglang/
│       ├── README.md
│       ├── config.env          # experiment-level configuration
│       ├── start_server.sh
│       ├── run_bench.sh
│       ├── parse_results.py
│       └── results/
│           └── 20260708-XXXXXX/
│               ├── report.md
│               ├── results.json
│               └── logs/
├── bench_results/              # legacy benchmark outputs (read-only history)
│   ├── dspark_grid_20260707-132641/
│   └── ...
├── logs/                       # server logs (stdout/stderr from start scripts)
├── datasets/                   # benchmark datasets
└── envs/                       # Python virtual environments

Rules

1. Experiments are the primary organization unit.

   • Each experiment lives under experiments/<experiment_name>/ and contains its scripts, configuration, and results.
   • Shared orchestration code lives in scripts/common/; do not copy server start / health check logic into every experiment.
   • Legacy experiments may remain under scripts/<group>/ with outputs in bench_results/, but new work should use experiments/.

2. Benchmark outputs live with their experiment.

   • For experiments/<name>/, results go in experiments/<name>/results/<RUN_ID>/.
   • Each run directory must contain report.md (human-readable) and results.json (structured data).
   • Raw outputs go in raw_outputs/; logs go in logs/.
   • Legacy bench_results/<experiment>_<timestamp>/ directories remain valid for archived runs.

3. Each bench_results/<run>/ directory must contain two final artifacts.

   • A Markdown report for human reading (e.g. report.md, comparison_report.md).
   • A JSON file with the complete structured result data for programmatic analysis (e.g. results.json).
   • The directory may also contain a README.md documenting provenance if the report alone does not cover it.

4. Final JSON must contain raw/structured data, not just summary numbers.

   • Metadata: experiment name, timestamp, model, backend/inference engine, hardware/accelerator, script path, environment/commit info.
   • Record the chip/accelerator (e.g. NVIDIA H200, Kunlun XPU) and the inference engine (e.g. vllm-dspark, sglang, vllm-xpu) explicitly. Do not infer them from directory names.
   • Per-scenario/per-configuration results: all request latencies, TTFT, TPOT, ITL, token counts, throughput, accept length, success/failure counts.
   • Include P50 / P90 / P95 / P99 percentiles where applicable.
   • Keep the schema stable so downstream Python scripts can parse all experiments uniformly.
   • See Final JSON Schema below for the recommended structure.

5. Scripts should default RESULT_ROOT to the experiment's results directory.

   • For experiments/<name>/run_bench.sh, default to experiments/<name>/results/${RUN_ID}/.
   • For legacy scripts, default to bench_results/<experiment>_${RUN_ID}/.
   • Allow override via RESULT_ROOT env var.
   • Use RUN_ID=$(date '+%Y%m%d-%H%M%S') unless specified.

6. Server start scripts write to logs/.

   • logs/<service>_<timestamp>.log
   • Keep server logs separate from benchmark result logs.

7. Scripts and outputs must record chip/accelerator and inference engine.

   • Every benchmark script should capture or accept the platform and engine it is running on (e.g. via environment variables CHIP, ACCELERATOR, ENGINE, BACKEND, or auto-detection).
   • Final reports and JSON outputs must include both the accelerator/chip family and the inference engine/backend used for the run.
   • Do not rely on the experiment name alone to identify the platform or engine.

8. Use platform configuration files for chip-specific constants.

   • Put per-platform settings in platforms/<chip>.env (e.g. platforms/kunlun_p800.env, platforms/nvidia_h200.env).
   • Scripts load the platform file via scripts/common/platform.sh; the active platform is selected by the PLATFORM env var or auto-detected.
   • Keep experiment scripts free of hardcoded device IDs, image names, or model root paths.

Naming Conventions

Experiment result directories

For experiment-centric layout:

experiments/<experiment>/results/<YYYYMMDD-HHMMSS>/

Examples:

• experiments/dsv4_p800_sglang/results/20260708-120000/
• experiments/dspark_grid/results/20260707-132641/

The results.json metadata already records chip/accelerator and engine, so the directory path does not need to encode them. If a single experiment must distinguish across platforms in its directory tree, use:

experiments/<experiment>/results/<chip>_<engine>_<YYYYMMDD-HHMMSS>/

Legacy result directories

bench_results/<experiment>_<YYYYMMDD-HHMMSS>/

Examples:

• bench_results/dspark_grid_20260707-132641/
• bench_results/dsv4_backend_comparison_20260707/

Raw output files

Include the accelerator and inference engine in raw output filenames so files from different platforms cannot overwrite each other.

For detailed per-request JSONL outputs:

{chip}_{engine}_{MMDD}_{concurrency}_{input_len}_{output_len}.jsonl

For summary JSON outputs from sglang.bench_serving --output-file:

{chip}_{engine}_{scenario}_{params}.json

Logs

logs/<service>_YYYYMMDD_HHMMSS.log
logs/<experiment>_orchestrator_YYYYMMDD_HHMMSS.log

Final JSON Schema

The JSON file inside each bench_results/<run>/ directory should follow a stable schema so that downstream Python scripts can load every experiment the same way. The file is usually named results.json.

Required top-level fields

{
  "metadata": {
    "experiment": "dspark_grid",
    "run_id": "20260707-132641",
    "timestamp": "2026-07-07T13:26:41+08:00",
    "model": "/data/models/DeepSeek-V4-Flash-DSpark",
    "backend": "vllm-dspark",
    "engine": "vllm-dspark",
    "hardware": "8x NVIDIA H200 143GB",
    "accelerator": "NVIDIA H200",
    "chip": "NVIDIA H200",
    "script": "scripts/benchmark_dspark_0707/run_dspark_benchmark_grid.sh",
    "env": "/data/user1/yy/envs/vllm-dspark",
    "git_commit": "optional git sha",
    "description": "optional free-text note"
  },
  "config": {
    "tp": 8,
    "kv_cache_dtype": "fp8",
    "spec_method": "dspark",
    "spec_tokens": 5,
    "block_size": 256,
    "max_num_seqs": 256,
    "extra_args": "--no-disable-hybrid-kv-cache-manager"
  },
  "scenarios": [
    {
      "name": "chat_short",
      "concurrency": 64,
      "input_len": 1000,
      "output_len": 256,
      "duration_s": 21.27,
      "success": 512,
      "failed": 0,
      "request_throughput": 24.07,
      "input_token_throughput": 6391.14,
      "output_token_throughput": 3189.39,
      "total_token_throughput": 9580.52,
      "accept_length": 3.2,
      "latencies": {
        "e2e_ms": { "mean": 2547.81, "p50": 2400.0, "p90": 4800.0, "p95": 5606.07, "p99": 6543.97 },
        "ttft_ms": { "mean": 268.68, "p50": 240.0, "p90": 480.0, "p95": 543.21, "p99": 588.63 },
        "tpot_ms": { "mean": 18.24, "p50": 16.0, "p90": 28.0, "p95": 30.39, "p99": 39.57 },
        "itl_ms": { "mean": 70.29, "p50": 60.0, "p90": 110.0, "p95": 130.0, "p99": 160.0 }
      },
      "raw_requests": [
        {
          "request_id": "uuid-or-index",
          "input_tokens": 1000,
          "output_tokens": 256,
          "e2e_ms": 2500.0,
          "ttft_ms": 260.0,
          "tpot_ms": 18.0,
          "itl_ms": 70.0,
          "accept_length": 3.0,
          "success": true
        }
      ]
    }
  ]
}

Notes

• raw_requests is optional but recommended when the JSON size is manageable. If a single run produces millions of requests, store per-request data as raw_outputs/*.jsonl and keep only aggregated percentiles in results.json.
• Always include P50 / P90 / P95 / P99 for TTFT, TPOT, E2E, and ITL. P95 is the primary SLO metric.
• Keep field names snake_case and consistent across experiments.
• Record hardware and engine information explicitly:
  • accelerator / chip: the accelerator family, e.g. NVIDIA H200, Kunlun XPU, AMD MI300X.
  • engine / backend: the inference engine or serving backend, e.g. vllm-dspark, sglang, vllm-xpu.
  • hardware: a human-readable full hardware description, e.g. 8x NVIDIA H200 143GB, 8x Kunlun XPU R480.
  • Keep at least one of accelerator or chip, and at least one of engine or backend, populated in every run.
• If a metric is not applicable (e.g. accept_length for non-speculative decoding), set it to null rather than omitting the key.

Quick Start

Run P800 SGLang benchmark

bash experiments/dsv4_p800_sglang/run_bench.sh

Run legacy DSpark grid benchmark

bash scripts/benchmark_dspark_0707/run_dspark_benchmark_grid.sh

Run DSpark spec-tokens comparison

bash scripts/benchmark_dspark_0707/run_dspark_st_comparison.sh

Parse results

# Experiment-centric layout
python3 experiments/dsv4_p800_sglang/parse_results.py \
  experiments/dsv4_p800_sglang/results/<run_id>

# Legacy layout
/data/user1/yy/envs/sglang/bin/python scripts/benchmark_dspark_0707/parse_results.py \
  /data/user1/yy/bench_results/dspark_grid_<run_id>

Cross-experiment comparison

python3 scripts/analysis/compare_experiments.py

Checklist Before Committing / Archiving

• No .jsonl, .json, .log, or .md files left in the project root.
• For experiments/<name>/, outputs live in experiments/<name>/results/<timestamp>/.
• For legacy runs, outputs live in bench_results/<experiment>_<timestamp>/.
• <run>/report.md (or equivalent human-readable .md) exists.
• <run>/results.json exists and follows the Final JSON Schema.
• <run>/results.json metadata records the chip/accelerator and engine/backend used.
• Raw output filenames include the chip/accelerator and engine when cross-platform runs may collide.
• <run>/README.md exists and documents provenance (or the report itself covers provenance).
• Scripts either live under experiments/<name>/ or in scripts/ (or scripts/<group>/).
• Script path references updated after moving.