{
  "schema": "stable-upstream-long-stability-benchmark-v1",
  "date": "2026-08-10",
  "topology": {
    "endpoint_picker_replicas": 1,
    "model_replicas": 1,
    "gpus_per_model_replica": 1
  },
  "hardware": {
    "gpu_per_model_replica": "NVIDIA H100"
  },
  "model_service": {
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    "runtime": "Red Hat AI Inference Server vLLM",
    "tensor_parallel_size": 1,
    "max_model_len": 32768,
    "max_num_batched_tokens": 8192,
    "max_num_seqs": 128,
    "gpu_memory_utilization": 0.9,
    "prefix_cache": "disabled"
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  "endpoint_picker": {
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    "flow_control_gate": "enabled",
    "detector": "request-concurrency",
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    "headroom": 0.1,
    "picker": "random",
    "priority_bands": [
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      50,
      0,
      -10
    ],
    "fairness": "round-robin within each priority band"
  },
  "traffic": {
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    "description": "Thirty-minute cache-off mixed workload with two matched surges.",
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            "end_s": 240
          },
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            "end_s": 660
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          {
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            "end_s": 870
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            "name": "surge-2",
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            "end_s": 1260
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          {
            "name": "recovery-2",
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            "end_s": 1470
          },
          {
            "name": "final",
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            "end_s": 1770
          }
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            "input_tokens": 1024,
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                "phase_offset": 0.0,
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                "rate_spike_probability": 0.02
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              {
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                "phase_offset": 0.0,
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                "rate_pattern": "noisy_sinusoidal",
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                "duration_s": 300,
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                "rate_amplitude": 1,
                "period_s": 37,
                "phase_offset": 0.0,
                "rate_noise": 0.2
              }
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            "input_tokens": 4096,
            "output_tokens": 512,
            "phases": [
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                "rate_spike_probability": 0.02
              },
              {
                "start_s": 300,
                "duration_s": 420,
                "rate_pattern": "noisy_sinusoidal",
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                "phase_offset": 0.2,
                "rate_noise": 0.09,
                "rate_spike_probability": 0.02,
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              },
              {
                "start_s": 720,
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                "rate_pattern": "noisy_sinusoidal",
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              },
              {
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                "duration_s": 420,
                "rate_pattern": "noisy_sinusoidal",
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                "phase_offset": 0.2,
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              {
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                "phase_offset": 0.2,
                "rate_noise": 0.025
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            ]
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          {
            "fairness_id": "standard-long-context",
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            "input_tokens": 20000,
            "output_tokens": 128,
            "phases": [
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                "rate_spike_probability": 0.02
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              {
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                "phase_offset": 0.4,
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              {
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            "output_tokens": 128,
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              {
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            ]
          }
        ]
      }
    ]
  },
  "execution": {
    "arrival": "open-loop Poisson replay with noisy sinusoidal phases",
    "duration_seconds": 1800,
    "production_runs": 1,
    "load_generator": "GuideLLM",
    "cache_mode": "off"
  },
  "decision_limits": {
    "all_requests_complete": true,
    "flow_control_engages_in_both_surges": true,
    "queue_drains_after_each_surge": true,
    "maximum_second_surge_p95_regression_percent": 20,
    "premium_surge_p95_ttft_guardrail_ms": 3000,
    "endpoint_picker_restarts": 0
  },
  "runner": {
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    "sha256": "3811ec26c46bf3a26fa643698ec54bf569bb4bc99c3ea22ca18f805cb077b8e0",
    "traffic_driver": "GuideLLM",
    "guidellm_version": "0.7.0",
    "trace_compiler": "pipeline/guidellm_trace.py",
    "launcher": "pipeline/run_guidellm_scenario.py",
    "scenario_file": "scenario.json"
  }
}
