results(max-context): complete H200 max context length exploration run 20260708-143534

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yy-fighting 2026-07-08 15:33:48 +00:00
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# H200 Max Context Length Exploration Report
- Result root: `/data/user1/yy/experiments/dsv4_h200_max_context_length/results/20260708-143534`
- Model: `/data/models/DeepSeek-V4-Flash`
- Hardware: 8x NVIDIA H200 143GB
- TP: 8
- Output len: 1, num prompts: 1, concurrency: 1
## Per-attempt results
| Backend | Target len | Max model/context len | Status | TTFT mean(ms) | TTFT P95(ms) | E2E mean(ms) | E2E P99(ms) | Error |
|---|---:|---:|---:|---:|---:|---:|---:|---:|
| sglang | 65536 | 66560 | ✅ pass | 521.23 | 521.23 | 521.25 | 521.25 | |
| sglang | 131072 | 132096 | ✅ pass | 668.67 | 668.67 | 668.69 | 668.69 | |
| sglang | 262144 | 263168 | ✅ pass | 1232.63 | 1232.63 | 1232.65 | 1232.65 | |
| sglang | 393216 | 394240 | ✅ pass | 1496.49 | 1496.49 | 1496.53 | 1496.53 | |
| sglang | 524288 | 525312 | ✅ pass | 1764.18 | 1764.18 | 1764.23 | 1764.23 | |
| sglang | 655360 | 656384 | ✅ pass | 2129.19 | 2129.19 | 2129.24 | 2129.24 | |
| sglang | 786432 | 787456 | ✅ pass | 2440.34 | 2440.34 | 2440.35 | 2440.35 | |
| sglang | 917504 | 918528 | ✅ pass | 3149.58 | 3149.58 | 3149.61 | 3149.61 | |
| sglang | 1048576 | 1049600 | ❌ fail | 0.00 | 0.00 | 0.00 | 0.00 | server failed to start |
| vllm | 65536 | 66560 | ✅ pass | 594.47 | 594.47 | 594.53 | 594.53 | |
| vllm | 131072 | 132096 | ✅ pass | 889.46 | 889.46 | 889.51 | 889.51 | |
| vllm | 262144 | 263168 | ✅ pass | 1178.53 | 1178.53 | 1178.56 | 1178.56 | |
| vllm | 393216 | 394240 | ✅ pass | 1371.19 | 1371.19 | 1371.24 | 1371.24 | |
| vllm | 524288 | 525312 | ✅ pass | 2582.85 | 2582.85 | 2582.90 | 2582.90 | |
| vllm | 655360 | 656384 | ✅ pass | 2203.55 | 2203.55 | 2203.59 | 2203.59 | |
| vllm | 786432 | 787456 | ✅ pass | 3886.52 | 3886.52 | 3886.57 | 3886.57 | |
| vllm | 917504 | 918528 | ✅ pass | 3715.61 | 3715.61 | 3715.64 | 3715.64 | |
| vllm | 1048576 | 1049600 | ❌ fail | 0.00 | 0.00 | 0.00 | 0.00 | server failed to start |
## Maximum supported input length
- **sglang**: 917504 tokens
- **vllm**: 917504 tokens

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{
"metadata": {
"experiment": "dsv4_h200_max_context_length",
"run_id": "20260708-143534",
"timestamp": "2026-07-08T14:35:34+00:00",
"model": "/data/models/DeepSeek-V4-Flash",
"backend": "sglang+vllm",
"engine": "sglang+vllm",
"hardware": "8x NVIDIA H200 143GB",
"accelerator": "NVIDIA H200",
"chip": "nvidia_h200",
"script": "experiments/dsv4_h200_max_context_length/run_bench.sh",
"env": "/data/user1/yy/envs/sglang",
"git_commit": "ef65885",
"git_dirty": "dirty",
"description": "H200 max context length exploration for DeepSeek-V4-Flash"
},
"config": {
"tp": 8,
"cuda_visible_devices": "0,1,2,3,4,5,6,7",
"output_len": 1,
"num_prompts": 1,
"max_concurrency": 1,
"request_rate": 10000,
"context_pad": 1024
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"scenarios": [
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