Optimizing Qwen3-8B Latency on NVIDIA H100 GPUs
Conclusion
Recommended configuration for optimizing latency of Qwen3-8B on H100 GPUs:
Serving Command
python3 -m sglang.launch_server \
--model Qwen/Qwen3-8B-FP8 \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 \
--speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
Comparison of benchmark results before and after optimization:
| Benchmark Case | Baseline (vLLM without any optimizations) | Optimized |
|---|---|---|
| ShareGPT BS=1 | Mean latency: 1.66s/req | Mean latency: 0.62s/req (2.7x faster) |
| ShareGPT BS=2 | Mean latency: 1.68s/req | Mean latency: 0.71s/req (2.4x faster) |
| ShareGPT BS=4 | Mean latency: 1.68s/req | Mean latency: 0.77s/req (2.2x faster) |
| ShareGPT BS=8 | Mean latency: 1.78s/req | Mean latency: 1.10s/req (1.6x faster) |
Note
- Our benchmark tests do not cover all possible optimization combinations. For example, we select the inference engine that performs best under its default configuration as the starting point for further tuning. This pruning approach yields a local optimum, which may not be the global optimum.
- There are other optimization methods that depend on specific user scenarios, including max batch size, schedule configuration, extended KV cache, CUDA graph, etc. The conclusions in this document can serve as a starting point for more targeted optimizations.
- The tests are conducted on specific hardware and software setups. Advances in the inference engine may lead to new conclusions.
- Although using quantization may impact accuracy. FP8 quantization can achieves less than 1% accuracy drop for most models. See the evaluation results for more details. Therefore, it is highly recommended to use FP8 quantization for low-latency serving scenarios.
- Speculative decoding can significantly reduce latency for low-concurrency requests. However, the acceleration effect may vary depending on the data distribution of different benchmark datasets and the choice of draft models. For example, the chosen draft model here is trained on English data, which may lead to suboptimal performance on other languages.
If there are any missing points or updates reflecting new changes, please let us know.
Optimization Objective
Achieve low latency under low-concurrency (batch size < 8) request scenarios.
Experimental Setup
Model
Qwen/Qwen3-8B
Hardware
NVIDIA H100 GPUs
Engine Version
- vLLM: v0.11.0
- SGLang: v0.5.3.post3
- TensorRT-LLM: v1.2.0rc1
Benchmark Dataset
ShareGPT
Benchmark Script
We use the vLLM bench CLI tool to benchmark the model performance. The following command is used to run the benchmark:
# Prepare the ShareGPT dataset
wget https://huggingface.co/datasets/anon8231489123/ShareGPT_Vicuna_unfiltered/resolve/main/ShareGPT_V3_unfiltered_cleaned_split.json
# Benchmark on ShareGPT dataset
vllm bench serve --model Qwen/Qwen3-8B --backend openai-chat --endpoint /v1/chat/completions --dataset-name sharegpt --dataset-path ShareGPT_V3_unfiltered_cleaned_split.json --num-prompts 100 --max-concurrency 4
Experiment Results
1. Choosing the Inference Engine
vLLM
Serving script
vllm serve Qwen/Qwen3-8B
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 44.40
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.25
Output token throughput (tok/s): 496.88
Peak output token throughput (tok/s): 540.00
Peak concurrent requests: 13.00
Total Token throughput (tok/s): 1020.76
---------------Time to First Token----------------
Mean TTFT (ms): 64.00
Median TTFT (ms): 60.26
P99 TTFT (ms): 98.59
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.38
Median TPOT (ms): 7.40
P99 TPOT (ms): 7.96
---------------Inter-token Latency----------------
Mean ITL (ms): 7.78
Median ITL (ms): 7.37
P99 ITL (ms): 40.98
==================================================
SGLang
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 41.97
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.38
Output token throughput (tok/s): 525.59
Peak output token throughput (tok/s): 572.00
Peak concurrent requests: 12.00
Total Token throughput (tok/s): 1079.74
---------------Time to First Token----------------
Mean TTFT (ms): 27.70
Median TTFT (ms): 27.25
P99 TTFT (ms): 43.35
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.19
Median TPOT (ms): 7.14
P99 TPOT (ms): 7.90
---------------Inter-token Latency----------------
Mean ITL (ms): 7.08
Median ITL (ms): 7.04
P99 ITL (ms): 11.48
==================================================
TensorRT-LLM
Serving script
trtllm-serve Qwen/Qwen3-8B
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 45.26
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.21
Output token throughput (tok/s): 487.38
Peak output token throughput (tok/s): 541.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1001.25
---------------Time to First Token----------------
Mean TTFT (ms): 51.61
Median TTFT (ms): 45.46
P99 TTFT (ms): 134.71
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.67
Median TPOT (ms): 7.58
P99 TPOT (ms): 10.15
---------------Inter-token Latency----------------
Mean ITL (ms): 7.59
Median ITL (ms): 7.41
P99 ITL (ms): 24.38
==================================================
Mean latency per request: SGLang(1.61 s) < vLLM (1.68 s) > TensorRT-LLM (1.74 s)
2. Maximum batch size for cuda graph in SGLang
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B --cuda-graph-max-bs 8
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 42.04
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.38
Output token throughput (tok/s): 524.71
Peak output token throughput (tok/s): 572.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1077.94
---------------Time to First Token----------------
Mean TTFT (ms): 28.46
Median TTFT (ms): 27.35
P99 TTFT (ms): 39.82
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.20
Median TPOT (ms): 7.15
P99 TPOT (ms): 8.13
---------------Inter-token Latency----------------
Mean ITL (ms): 7.09
Median ITL (ms): 7.04
P99 ITL (ms): 11.56
==================================================
3. Quantization
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B-FP8
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 33.54
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.98
Output token throughput (tok/s): 657.83
Peak output token throughput (tok/s): 741.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1351.41
---------------Time to First Token----------------
Mean TTFT (ms): 39.66
Median TTFT (ms): 33.38
P99 TTFT (ms): 134.98
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 5.65
Median TPOT (ms): 5.58
P99 TPOT (ms): 7.35
---------------Inter-token Latency----------------
Mean ITL (ms): 5.58
Median ITL (ms): 5.39
P99 ITL (ms): 22.20
==================================================
4. Attention Backend
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B-FP8 --attention-backend triton
Benchmark result
# triton
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 34.73
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.88
Output token throughput (tok/s): 635.15
Peak output token throughput (tok/s): 744.00
Peak concurrent requests: 10.00
Total Token throughput (tok/s): 1304.82
---------------Time to First Token----------------
Mean TTFT (ms): 60.18
Median TTFT (ms): 43.84
P99 TTFT (ms): 493.14
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 5.77
Median TPOT (ms): 5.63
P99 TPOT (ms): 7.78
---------------Inter-token Latency----------------
Mean ITL (ms): 5.71
Median ITL (ms): 5.40
P99 ITL (ms): 28.58
==================================================
# flashinfer
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 39.63
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.52
Output token throughput (tok/s): 556.61
Peak output token throughput (tok/s): 728.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1143.47
---------------Time to First Token----------------
Mean TTFT (ms): 269.33
Median TTFT (ms): 40.70
P99 TTFT (ms): 5700.99
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 5.71
Median TPOT (ms): 5.63
P99 TPOT (ms): 7.44
---------------Inter-token Latency----------------
Mean ITL (ms): 5.65
Median ITL (ms): 5.40
P99 ITL (ms): 28.71
==================================================
5. Speculative Decoding
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B-FP8 \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 \
--speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
Benchmark result
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 22.53
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.44
Output token throughput (tok/s): 979.24
Peak output token throughput (tok/s): 393.00
Peak concurrent requests: 15.00
Total Token throughput (tok/s): 2011.70
---------------Time to First Token----------------
Mean TTFT (ms): 50.70
Median TTFT (ms): 43.71
P99 TTFT (ms): 368.54
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.75
Median TPOT (ms): 3.32
P99 TPOT (ms): 9.63
---------------Inter-token Latency----------------
Mean ITL (ms): 11.05
Median ITL (ms): 9.86
P99 ITL (ms): 38.76
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path AngelSlim/Qwen3-8B_eagle3 --speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 26.89
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 3.72
Output token throughput (tok/s): 820.28
Peak output token throughput (tok/s): 404.00
Peak concurrent requests: 13.00
Total Token throughput (tok/s): 1685.15
---------------Time to First Token----------------
Mean TTFT (ms): 44.60
Median TTFT (ms): 44.68
P99 TTFT (ms): 78.96
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 4.45
Median TPOT (ms): 4.40
P99 TPOT (ms): 7.91
---------------Inter-token Latency----------------
Mean ITL (ms): 10.49
Median ITL (ms): 9.88
P99 ITL (ms): 38.17
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 2 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 24.16
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.14
Output token throughput (tok/s): 913.20
Peak output token throughput (tok/s): 433.00
Peak concurrent requests: 12.00
Total Token throughput (tok/s): 1876.03
---------------Time to First Token----------------
Mean TTFT (ms): 49.89
Median TTFT (ms): 44.38
P99 TTFT (ms): 277.15
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.98
Median TPOT (ms): 3.74
P99 TPOT (ms): 7.81
---------------Inter-token Latency----------------
Mean ITL (ms): 9.82
Median ITL (ms): 8.86
P99 ITL (ms): 38.40
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 8 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 27.17
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 3.68
Output token throughput (tok/s): 811.85
Peak output token throughput (tok/s): 336.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1667.83
---------------Time to First Token----------------
Mean TTFT (ms): 64.58
Median TTFT (ms): 56.79
P99 TTFT (ms): 366.49
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 4.27
Median TPOT (ms): 4.00
P99 TPOT (ms): 8.41
---------------Inter-token Latency----------------
Mean ITL (ms): 13.94
Median ITL (ms): 12.20
P99 ITL (ms): 63.04
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 4 --speculative-eagle-topk 8 --speculative-num-draft-tokens 16
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 22.72
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.40
Output token throughput (tok/s): 971.03
Peak output token throughput (tok/s): 382.00
Peak concurrent requests: 14.00
Total Token throughput (tok/s): 1994.83
---------------Time to First Token----------------
Mean TTFT (ms): 49.08
Median TTFT (ms): 36.31
P99 TTFT (ms): 335.43
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.62
Median TPOT (ms): 3.36
P99 TPOT (ms): 9.61
---------------Inter-token Latency----------------
Mean ITL (ms): 11.24
Median ITL (ms): 10.14
P99 ITL (ms): 41.05
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 32
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 22.68
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.41
Output token throughput (tok/s): 972.69
Peak output token throughput (tok/s): 354.00
Peak concurrent requests: 15.00
Total Token throughput (tok/s): 1998.25
---------------Time to First Token----------------
Mean TTFT (ms): 50.97
Median TTFT (ms): 40.01
P99 TTFT (ms): 361.52
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.54
Median TPOT (ms): 3.38
P99 TPOT (ms): 7.82
---------------Inter-token Latency----------------
Mean ITL (ms): 11.90
Median ITL (ms): 10.67
P99 ITL (ms): 40.09
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 8
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 23.94
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.18
Output token throughput (tok/s): 921.47
Peak output token throughput (tok/s): 399.00
Peak concurrent requests: 14.00
Total Token throughput (tok/s): 1893.03
---------------Time to First Token----------------
Mean TTFT (ms): 47.83
Median TTFT (ms): 45.01
P99 TTFT (ms): 255.59
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.71
Median TPOT (ms): 3.59
P99 TPOT (ms): 6.20
---------------Inter-token Latency----------------
Mean ITL (ms): 10.71
Median ITL (ms): 9.78
P99 ITL (ms): 39.48
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 --speculative-num-steps 2 --speculative-eagle-topk 1 --speculative-num-draft-tokens 4
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 26.70
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 3.75
Output token throughput (tok/s): 826.28
Peak output token throughput (tok/s): 521.00
Peak concurrent requests: 12.00
Total Token throughput (tok/s): 1697.47
---------------Time to First Token----------------
Mean TTFT (ms): 56.09
Median TTFT (ms): 44.66
P99 TTFT (ms): 327.69
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 4.37
Median TPOT (ms): 4.10
P99 TPOT (ms): 7.78
---------------Inter-token Latency----------------
Mean ITL (ms): 8.78
Median ITL (ms): 7.62
P99 ITL (ms): 48.17
==================================================
# --speculative-algorithm EAGLE3 --speculative-draft-model-path Tengyunw/qwen3_8b_eagle3
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 25.80
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 3.88
Output token throughput (tok/s): 854.98
Peak output token throughput (tok/s): 392.00
Peak concurrent requests: 11.00
Total Token throughput (tok/s): 1756.43
---------------Time to First Token----------------
Mean TTFT (ms): 53.61
Median TTFT (ms): 45.08
P99 TTFT (ms): 374.04
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 4.07
Median TPOT (ms): 3.68
P99 TPOT (ms): 12.12
---------------Inter-token Latency----------------
Mean ITL (ms): 11.69
Median ITL (ms): 10.35
P99 ITL (ms): 40.08
==================================================
6. Torch.compile
Serving script
python3 -m sglang.launch_server --model-path Qwen/Qwen3-8B-FP8 \
--enable-torch-compile \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 \
--speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
Benchmark result
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 23.14
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.32
Output token throughput (tok/s): 953.40
Peak output token throughput (tok/s): 386.00
Peak concurrent requests: 14.00
Total Token throughput (tok/s): 1958.61
---------------Time to First Token----------------
Mean TTFT (ms): 54.86
Median TTFT (ms): 45.34
P99 TTFT (ms): 410.48
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.53
Median TPOT (ms): 3.30
P99 TPOT (ms): 9.67
---------------Inter-token Latency----------------
Mean ITL (ms): 11.38
Median ITL (ms): 9.96
P99 ITL (ms): 41.21
==================================================
Summary of Optimization Options
| Optimization Option | Throughput Improvement |
|---|---|
| Engine Selection | +4.3% |
| Quantization | +25.8% |
| Speculative Decoding | +66.2% |
| Max CUDA graph batch size | - |
| Attention Backend | - |
| Torch.compile | - |
Other Benchmark Cases
We further benchmarked the optimized configuration with different batch sizes.
Baseline serving script
vllm serve Qwen/Qwen3-8B
Baseline benchmark results
# BS=1
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 1
Benchmark duration (s): 166.04
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 0.60
Output token throughput (tok/s): 132.86
Peak output token throughput (tok/s): 140.00
Peak concurrent requests: 5.00
Total Token throughput (tok/s): 272.95
---------------Time to First Token----------------
Mean TTFT (ms): 59.01
Median TTFT (ms): 60.38
P99 TTFT (ms): 73.49
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.28
Median TPOT (ms): 7.22
P99 TPOT (ms): 7.52
---------------Inter-token Latency----------------
Mean ITL (ms): 7.26
Median ITL (ms): 7.23
P99 ITL (ms): 8.17
==================================================
# BS=2
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 2
Benchmark duration (s): 85.78
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 1.17
Output token throughput (tok/s): 257.19
Peak output token throughput (tok/s): 277.00
Peak concurrent requests: 7.00
Total Token throughput (tok/s): 528.35
---------------Time to First Token----------------
Mean TTFT (ms): 63.78
Median TTFT (ms): 64.78
P99 TTFT (ms): 93.70
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.37
Median TPOT (ms): 7.30
P99 TPOT (ms): 8.57
---------------Inter-token Latency----------------
Mean ITL (ms): 7.44
Median ITL (ms): 7.28
P99 ITL (ms): 8.75
==================================================
# BS=4
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 44.40
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.25
Output token throughput (tok/s): 496.88
Peak output token throughput (tok/s): 540.00
Peak concurrent requests: 13.00
Total Token throughput (tok/s): 1020.76
---------------Time to First Token----------------
Mean TTFT (ms): 64.00
Median TTFT (ms): 60.26
P99 TTFT (ms): 98.59
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.38
Median TPOT (ms): 7.40
P99 TPOT (ms): 7.96
---------------Inter-token Latency----------------
Mean ITL (ms): 7.78
Median ITL (ms): 7.37
P99 ITL (ms): 40.98
==================================================
# BS=8
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 8
Benchmark duration (s): 24.05
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.16
Output token throughput (tok/s): 917.28
Peak output token throughput (tok/s): 1039.00
Peak concurrent requests: 15.00
Total Token throughput (tok/s): 1884.42
---------------Time to First Token----------------
Mean TTFT (ms): 74.57
Median TTFT (ms): 60.77
P99 TTFT (ms): 204.11
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 7.71
Median TPOT (ms): 7.67
P99 TPOT (ms): 8.19
---------------Inter-token Latency----------------
Mean ITL (ms): 8.57
Median ITL (ms): 7.63
P99 ITL (ms): 45.48
==================================================
Optimized serving script
python3 -m sglang.launch_server \
--model Qwen/Qwen3-8B-FP8 \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Tengyunw/qwen3_8b_eagle3 \
--speculative-num-steps 4 --speculative-eagle-topk 4 --speculative-num-draft-tokens 16
Optimized benchmark results
# BS=1
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 1
Benchmark duration (s): 65.82
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 1.52
Output token throughput (tok/s): 335.15
Peak output token throughput (tok/s): 112.00
Peak concurrent requests: 6.00
Total Token throughput (tok/s): 688.51
---------------Time to First Token----------------
Mean TTFT (ms): 34.70
Median TTFT (ms): 34.11
P99 TTFT (ms): 40.56
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 2.67
Median TPOT (ms): 2.63
P99 TPOT (ms): 3.46
---------------Inter-token Latency----------------
Mean ITL (ms): 8.74
Median ITL (ms): 8.95
P99 ITL (ms): 10.46
==================================================
# BS=2
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 2
Benchmark duration (s): 37.62
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 2.66
Output token throughput (tok/s): 586.35
Peak output token throughput (tok/s): 210.00
Peak concurrent requests: 8.00
Total Token throughput (tok/s): 1204.57
---------------Time to First Token----------------
Mean TTFT (ms): 39.41
Median TTFT (ms): 41.19
P99 TTFT (ms): 57.69
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.04
Median TPOT (ms): 2.96
P99 TPOT (ms): 5.41
---------------Inter-token Latency----------------
Mean ITL (ms): 9.69
Median ITL (ms): 9.57
P99 ITL (ms): 34.00
==================================================
# BS=4
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 4
Benchmark duration (s): 21.09
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 4.74
Output token throughput (tok/s): 1046.22
Peak output token throughput (tok/s): 387.00
Peak concurrent requests: 14.00
Total Token throughput (tok/s): 2149.30
---------------Time to First Token----------------
Mean TTFT (ms): 39.93
Median TTFT (ms): 41.92
P99 TTFT (ms): 61.96
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 3.34
Median TPOT (ms): 3.17
P99 TPOT (ms): 5.61
---------------Inter-token Latency----------------
Mean ITL (ms): 10.54
Median ITL (ms): 9.84
P99 ITL (ms): 35.23
==================================================
# BS=8
============ Serving Benchmark Result ============
Successful requests: 100
Maximum request concurrency: 8
Benchmark duration (s): 13.46
Total input tokens: 23260
Total generated tokens: 22061
Request throughput (req/s): 7.43
Output token throughput (tok/s): 1638.82
Peak output token throughput (tok/s): 655.00
Peak concurrent requests: 19.00
Total Token throughput (tok/s): 3366.71
---------------Time to First Token----------------
Mean TTFT (ms): 42.27
Median TTFT (ms): 43.26
P99 TTFT (ms): 93.68
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms): 4.82
Median TPOT (ms): 3.94
P99 TPOT (ms): 21.36
---------------Inter-token Latency----------------
Mean ITL (ms): 13.06
Median ITL (ms): 10.94
P99 ITL (ms): 37.37
==================================================