Optimizing Qwen3.5-9B Latency

Conclusion

Recommended configuration for optimizing latency of Qwen/Qwen3.5-9B on NVIDIA H100 80GB HBM3:

Serving Command

vllm serve Qwen/Qwen3.5-9B \
    --reasoning-parser=qwen3 \
    --max-model-len=32768 \
    --speculative-config={"method":"mtp","num_speculative_tokens":1} \
    --language-model-only \
    --performance-mode=interactivity

Comparison of benchmark results before and after optimization:

Benchmark Case	Baseline (vLLM without any optimizations)	Optimized
Rate 1	Mean latency: 2.09s/req	Mean latency: 1.65s/req (1.26x faster)
Rate 4	Mean latency: 2.33s/req	Mean latency: 1.90s/req (1.23x faster)
Rate 8	Mean latency: 2.62s/req	Mean latency: 2.32s/req (1.13x faster)
Rate 16	Mean latency: 4.37s/req	Mean latency: 3.72s/req (1.17x 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 achieve 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.

Experimental Setup

Model

Qwen/Qwen3.5-9B

Hardware

NVIDIA H100 80GB HBM3

Engine Version

vLLM v0.17.1
SGLang v0.5.9

Benchmark Method

This project uses GPUStack's one-click benchmark capability for serving workloads. The benchmark tests in this document were executed with that workflow.

GPUStack's benchmark implementation is built on top of guidellm via the wrapper project benchmark-runner.

GPUStack handles model deployment, benchmark job submission, and result collection for the benchmark configurations listed below.

Benchmark Profiles

ShareGPT 8RPS

dataset_name: ShareGPT
request_rate: 8
total_requests: 1000

ShareGPT 1RPS

dataset_name: ShareGPT
request_rate: 1
total_requests: 1000

ShareGPT 4RPS

dataset_name: ShareGPT
request_rate: 4
total_requests: 1000

ShareGPT 16RPS

dataset_name: ShareGPT
request_rate: 16
total_requests: 1000

Open-Source Replacement

If you do not use GPUStack, you can replace the GPUStack benchmark workflow with direct guidellm benchmark commands.

For profiles with dataset_name: ShareGPT:

guidellm benchmark \
  --target ${target} \
  --profile constant \
  --rate ${request_rate} \
  --max-requests ${total_requests} \
  --processor ${model_path} \
  --data ./ShareGPT_V3_unfiltered_cleaned_split.json

Experiment Results

Choosing the Inference Engine

vLLM

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.18
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2197.17
Peak output token throughput (tok/s):    2885041.51
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4867.84
----------------------Latency---------------------
Mean Latency(s):                          2.62
Median Latency(s):                        2.29
P95 Latency(s):                           6.81
P99 Latency(s):                           7.75
---------------Time to First Token----------------
Mean TTFT (ms):                          41.12
Median TTFT (ms):                        33.92
P95 TTFT (ms):                           72.24
P99 TTFT (ms):                           141.44
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.34
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.18
P99 TPOT (ms):                           10.07
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.19
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.08
P99 ITL (ms):                            10.04
==================================================

SGLang

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--context-length=32768

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             96
Benchmark duration (s):                  131.60
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.60
Output token throughput (tok/s):         2145.85
Peak output token throughput (tok/s):    33380.30
Peak concurrent requests:                96.00
Total Token throughput (tok/s):          4754.13
----------------------Latency---------------------
Mean Latency(s):                          8.13
Median Latency(s):                        6.94
P95 Latency(s):                           20.20
P99 Latency(s):                           26.21
---------------Time to First Token----------------
Mean TTFT (ms):                          98.72
Median TTFT (ms):                        51.48
P95 TTFT (ms):                           212.72
P99 TTFT (ms):                           460.47
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          28.88
Median TPOT (ms):                        28.26
P95 TPOT (ms):                           43.34
P99 TPOT (ms):                           51.52
---------------Inter-token Latency----------------
Mean ITL (ms):                           28.63
Median ITL (ms):                         27.88
P95 ITL (ms):                            43.23
P99 ITL (ms):                            50.55
==================================================

Summary: vLLM Mean Latency = 2.62s, SGLang Mean Latency = 8.13s. vLLM is faster by 5.51s (3.10x faster). TTFT = 41.12 ms vs 98.72 ms, reduced by 57.60 ms (2.40x faster); TPOT = 1.34 ms vs 28.88 ms, reduced by 27.54 ms (21.62x faster).

Prefix Cache

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--enable-prefix-caching

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             32
Benchmark duration (s):                  130.23
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2212.47
Peak output token throughput (tok/s):    1443445.16
Peak concurrent requests:                32.00
Total Token throughput (tok/s):          4901.75
----------------------Latency---------------------
Mean Latency(s):                          2.69
Median Latency(s):                        2.36
P95 Latency(s):                           6.95
P99 Latency(s):                           7.94
---------------Time to First Token----------------
Mean TTFT (ms):                          46.19
Median TTFT (ms):                        34.75
P95 TTFT (ms):                           90.30
P99 TTFT (ms):                           233.30
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.38
Median TPOT (ms):                        0.12
P95 TPOT (ms):                           9.49
P99 TPOT (ms):                           10.50
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.22
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.35
P99 ITL (ms):                            10.40
==================================================

Max Batch Token

16k

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--max-num-batched-tokens=16384

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.20
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2220.17
Peak output token throughput (tok/s):    2763536.75
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4918.81
----------------------Latency---------------------
Mean Latency(s):                          2.64
Median Latency(s):                        2.30
P95 Latency(s):                           6.87
P99 Latency(s):                           7.79
---------------Time to First Token----------------
Mean TTFT (ms):                          42.05
Median TTFT (ms):                        34.13
P95 TTFT (ms):                           76.02
P99 TTFT (ms):                           190.03
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.26
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.19
P99 TPOT (ms):                           10.11
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.11
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.13
P99 ITL (ms):                            10.04
==================================================

32k

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--max-num-batched-tokens=32768

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.20
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2196.67
Peak output token throughput (tok/s):    1167858.46
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4866.73
----------------------Latency---------------------
Mean Latency(s):                          2.64
Median Latency(s):                        2.31
P95 Latency(s):                           6.88
P99 Latency(s):                           7.81
---------------Time to First Token----------------
Mean TTFT (ms):                          41.88
Median TTFT (ms):                        34.03
P95 TTFT (ms):                           76.91
P99 TTFT (ms):                           164.85
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.38
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.34
P99 TPOT (ms):                           10.14
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.23
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.20
P99 ITL (ms):                            10.09
==================================================

Summary: 16k Mean Latency = 2.64s, 32k Mean Latency = 2.64s. 16k is faster by 0.00s (1.00x faster). TTFT = 42.05 ms vs 41.88 ms, increased by 0.17 ms (1.00x slower); TPOT = 1.26 ms vs 1.38 ms, reduced by 0.12 ms (1.10x faster).

Max Num Seqs

Seqs 128

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--max-num-seqs=128

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.18
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2213.28
Peak output token throughput (tok/s):    3033763.06
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4903.53
----------------------Latency---------------------
Mean Latency(s):                          2.66
Median Latency(s):                        2.32
P95 Latency(s):                           6.91
P99 Latency(s):                           7.82
---------------Time to First Token----------------
Mean TTFT (ms):                          44.11
Median TTFT (ms):                        35.02
P95 TTFT (ms):                           75.65
P99 TTFT (ms):                           197.93
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.33
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.53
P99 TPOT (ms):                           10.28
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.17
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.48
P99 ITL (ms):                            10.23
==================================================

Seqs 256

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--max-num-seqs=256

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.18
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2196.96
Peak output token throughput (tok/s):    1994998.46
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4867.37
----------------------Latency---------------------
Mean Latency(s):                          2.64
Median Latency(s):                        2.30
P95 Latency(s):                           6.82
P99 Latency(s):                           7.79
---------------Time to First Token----------------
Mean TTFT (ms):                          42.97
Median TTFT (ms):                        34.30
P95 TTFT (ms):                           77.05
P99 TTFT (ms):                           187.56
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.32
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.23
P99 TPOT (ms):                           10.28
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.17
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.16
P99 ITL (ms):                            10.16
==================================================

Summary: Seqs 256 Mean Latency = 2.64s, Seqs 128 Mean Latency = 2.66s. Seqs 256 is faster by 0.02s (1.01x faster). TTFT = 42.97 ms vs 44.11 ms, reduced by 1.13 ms (1.03x faster); TPOT = 1.32 ms vs 1.33 ms, reduced by 0.01 ms (1.01x faster).

Speculative Decoding

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--max-model-len=32768

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             28
Benchmark duration (s):                  129.03
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.75
Output token throughput (tok/s):         2224.24
Peak output token throughput (tok/s):    9620127.05
Peak concurrent requests:                28.00
Total Token throughput (tok/s):          4927.83
----------------------Latency---------------------
Mean Latency(s):                          2.39
Median Latency(s):                        2.08
P95 Latency(s):                           6.12
P99 Latency(s):                           7.17
---------------Time to First Token----------------
Mean TTFT (ms):                          81.50
Median TTFT (ms):                        55.93
P95 TTFT (ms):                           96.41
P99 TTFT (ms):                           788.19
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.29
Median TPOT (ms):                        0.18
P95 TPOT (ms):                           8.45
P99 TPOT (ms):                           9.48
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.01
Median ITL (ms):                         0.00
P95 ITL (ms):                            8.31
P99 ITL (ms):                            9.42
==================================================

Speculative Decoding && Performance Mode

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--performance-mode=interactivity
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             28
Benchmark duration (s):                  129.07
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.75
Output token throughput (tok/s):         2214.80
Peak output token throughput (tok/s):    1904162.55
Peak concurrent requests:                28.00
Total Token throughput (tok/s):          4906.90
----------------------Latency---------------------
Mean Latency(s):                          2.38
Median Latency(s):                        2.09
P95 Latency(s):                           6.09
P99 Latency(s):                           7.20
---------------Time to First Token----------------
Mean TTFT (ms):                          82.37
Median TTFT (ms):                        55.71
P95 TTFT (ms):                           96.16
P99 TTFT (ms):                           960.28
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.42
Median TPOT (ms):                        0.18
P95 TPOT (ms):                           8.54
P99 TPOT (ms):                           9.65
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.13
Median ITL (ms):                         0.00
P95 ITL (ms):                            8.39
P99 ITL (ms):                            9.08
==================================================

Speculative Decoding && Performance Mode && Language Model

Profile: ShareGPT 8RPS

Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--language-model-only
--performance-mode=interactivity

Benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             27
Benchmark duration (s):                  128.98
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.75
Output token throughput (tok/s):         2214.46
Peak output token throughput (tok/s):    4861500.66
Peak concurrent requests:                27.00
Total Token throughput (tok/s):          4906.15
----------------------Latency---------------------
Mean Latency(s):                          2.32
Median Latency(s):                        2.02
P95 Latency(s):                           5.99
P99 Latency(s):                           6.89
---------------Time to First Token----------------
Mean TTFT (ms):                          80.63
Median TTFT (ms):                        54.04
P95 TTFT (ms):                           96.82
P99 TTFT (ms):                           933.41
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.31
Median TPOT (ms):                        0.17
P95 TPOT (ms):                           8.19
P99 TPOT (ms):                           9.47
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.02
Median ITL (ms):                         0.00
P95 ITL (ms):                            8.03
P99 ITL (ms):                            8.91
==================================================

Summary of Optimization Options

Benchmark Case	Group	Optimized	Baseline	Comparison
ShareGPT 8RPS (r=8)	Choosing the Inference Engine	2.62s	2.62s	(1.00x faster)
ShareGPT 8RPS (r=8)	Prefix Cache	2.69s	2.62s	(1.03x slower)
ShareGPT 8RPS (r=8)	Max Batch Token	2.64s	2.62s	(1.01x slower)
ShareGPT 8RPS (r=8)	Max Num Seqs	2.64s	2.62s	(1.01x slower)
ShareGPT 8RPS (r=8)	Speculative Decoding	2.39s	2.62s	(1.09x faster)
ShareGPT 8RPS (r=8)	Speculative Decoding && Performance Mode	2.38s	2.62s	(1.10x faster)
ShareGPT 8RPS (r=8)	Speculative Decoding && Performance Mode && Language Model	2.32s	2.62s	(1.13x faster)

Other Benchmark Cases

Rate 1

Baseline Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768

Baseline benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             6
Benchmark duration (s):                  1001.23
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              1.00
Output token throughput (tok/s):         281.69
Peak output token throughput (tok/s):    211793.17
Peak concurrent requests:                6.00
Total Token throughput (tok/s):          624.09
----------------------Latency---------------------
Mean Latency(s):                          2.09
Median Latency(s):                        1.85
P95 Latency(s):                           5.42
P99 Latency(s):                           6.27
---------------Time to First Token----------------
Mean TTFT (ms):                          37.03
Median TTFT (ms):                        31.51
P95 TTFT (ms):                           63.17
P99 TTFT (ms):                           95.35
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          0.94
Median TPOT (ms):                        0.10
P95 TPOT (ms):                           7.38
P99 TPOT (ms):                           7.51
---------------Inter-token Latency----------------
Mean ITL (ms):                           0.81
Median ITL (ms):                         0.00
P95 ITL (ms):                            7.34
P99 ITL (ms):                            7.47
==================================================

Optimized Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--language-model-only
--performance-mode=interactivity

Optimized benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             5
Benchmark duration (s):                  1000.35
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              1.00
Output token throughput (tok/s):         281.69
Peak output token throughput (tok/s):    271386.26
Peak concurrent requests:                5.00
Total Token throughput (tok/s):          624.08
----------------------Latency---------------------
Mean Latency(s):                          1.65
Median Latency(s):                        1.45
P95 Latency(s):                           4.28
P99 Latency(s):                           4.98
---------------Time to First Token----------------
Mean TTFT (ms):                          54.58
Median TTFT (ms):                        50.45
P95 TTFT (ms):                           75.37
P99 TTFT (ms):                           123.14
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          0.91
Median TPOT (ms):                        0.15
P95 TPOT (ms):                           5.90
P99 TPOT (ms):                           6.22
---------------Inter-token Latency----------------
Mean ITL (ms):                           0.72
Median ITL (ms):                         0.00
P95 ITL (ms):                            5.75
P99 ITL (ms):                            6.14
==================================================

Rate 4

Baseline Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768

Baseline benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             15
Benchmark duration (s):                  254.36
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              3.93
Output token throughput (tok/s):         1126.78
Peak output token throughput (tok/s):    800262.91
Peak concurrent requests:                15.00
Total Token throughput (tok/s):          2496.39
----------------------Latency---------------------
Mean Latency(s):                          2.33
Median Latency(s):                        2.06
P95 Latency(s):                           5.96
P99 Latency(s):                           6.94
---------------Time to First Token----------------
Mean TTFT (ms):                          38.09
Median TTFT (ms):                        31.67
P95 TTFT (ms):                           67.05
P99 TTFT (ms):                           109.44
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.15
Median TPOT (ms):                        0.10
P95 TPOT (ms):                           8.25
P99 TPOT (ms):                           8.73
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.02
Median ITL (ms):                         0.00
P95 ITL (ms):                            8.19
P99 ITL (ms):                            8.67
==================================================

Optimized Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--language-model-only
--performance-mode=interactivity

Optimized benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             13
Benchmark duration (s):                  253.27
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              3.95
Output token throughput (tok/s):         1126.67
Peak output token throughput (tok/s):    996666.30
Peak concurrent requests:                13.00
Total Token throughput (tok/s):          2496.15
----------------------Latency---------------------
Mean Latency(s):                          1.90
Median Latency(s):                        1.66
P95 Latency(s):                           4.91
P99 Latency(s):                           5.82
---------------Time to First Token----------------
Mean TTFT (ms):                          57.94
Median TTFT (ms):                        52.57
P95 TTFT (ms):                           77.15
P99 TTFT (ms):                           112.48
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          0.97
Median TPOT (ms):                        0.16
P95 TPOT (ms):                           6.79
P99 TPOT (ms):                           7.25
---------------Inter-token Latency----------------
Mean ITL (ms):                           0.76
Median ITL (ms):                         0.00
P95 ITL (ms):                            6.64
P99 ITL (ms):                            7.11
==================================================

Rate 8

Baseline Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768

Baseline benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             31
Benchmark duration (s):                  130.18
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.68
Output token throughput (tok/s):         2197.17
Peak output token throughput (tok/s):    2885041.51
Peak concurrent requests:                31.00
Total Token throughput (tok/s):          4867.84
----------------------Latency---------------------
Mean Latency(s):                          2.62
Median Latency(s):                        2.29
P95 Latency(s):                           6.81
P99 Latency(s):                           7.75
---------------Time to First Token----------------
Mean TTFT (ms):                          41.12
Median TTFT (ms):                        33.92
P95 TTFT (ms):                           72.24
P99 TTFT (ms):                           141.44
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.34
Median TPOT (ms):                        0.11
P95 TPOT (ms):                           9.18
P99 TPOT (ms):                           10.07
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.19
Median ITL (ms):                         0.00
P95 ITL (ms):                            9.08
P99 ITL (ms):                            10.04
==================================================

Optimized Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--language-model-only
--performance-mode=interactivity

Optimized benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             27
Benchmark duration (s):                  128.98
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              7.75
Output token throughput (tok/s):         2214.46
Peak output token throughput (tok/s):    4861500.66
Peak concurrent requests:                27.00
Total Token throughput (tok/s):          4906.15
----------------------Latency---------------------
Mean Latency(s):                          2.32
Median Latency(s):                        2.02
P95 Latency(s):                           5.99
P99 Latency(s):                           6.89
---------------Time to First Token----------------
Mean TTFT (ms):                          80.63
Median TTFT (ms):                        54.04
P95 TTFT (ms):                           96.82
P99 TTFT (ms):                           933.41
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.31
Median TPOT (ms):                        0.17
P95 TPOT (ms):                           8.19
P99 TPOT (ms):                           9.47
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.02
Median ITL (ms):                         0.00
P95 ITL (ms):                            8.03
P99 ITL (ms):                            8.91
==================================================

Rate 16

Baseline Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768

Baseline benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             97
Benchmark duration (s):                  68.59
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              14.58
Output token throughput (tok/s):         4119.85
Peak output token throughput (tok/s):    4297231.71
Peak concurrent requests:                97.00
Total Token throughput (tok/s):          9127.56
----------------------Latency---------------------
Mean Latency(s):                          4.37
Median Latency(s):                        3.74
P95 Latency(s):                           10.93
P99 Latency(s):                           14.05
---------------Time to First Token----------------
Mean TTFT (ms):                          63.36
Median TTFT (ms):                        52.12
P95 TTFT (ms):                           111.22
P99 TTFT (ms):                           283.00
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          2.07
Median TPOT (ms):                        0.17
P95 TPOT (ms):                           16.46
P99 TPOT (ms):                           18.09
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.85
Median ITL (ms):                         0.00
P95 ITL (ms):                            16.34
P99 ITL (ms):                            17.94
==================================================

Optimized Backend Parameters:

--reasoning-parser=qwen3
--max-model-len=32768
--speculative-config={"method":"mtp","num_speculative_tokens":1}
--language-model-only
--performance-mode=interactivity

Optimized benchmark result

============ Serving Benchmark Result ============
Successful requests:                     1000
Maximum request concurrency:             77
Benchmark duration (s):                  67.27
Total input tokens:                      342058
Total generated tokens:                  281412
Request throughput (req/s):              14.86
Output token throughput (tok/s):         4191.07
Peak output token throughput (tok/s):    3207595.57
Peak concurrent requests:                77.00
Total Token throughput (tok/s):          9285.35
----------------------Latency---------------------
Mean Latency(s):                          3.72
Median Latency(s):                        3.31
P95 Latency(s):                           9.44
P99 Latency(s):                           11.45
---------------Time to First Token----------------
Mean TTFT (ms):                          81.88
Median TTFT (ms):                        66.01
P95 TTFT (ms):                           149.68
P99 TTFT (ms):                           375.11
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          1.92
Median TPOT (ms):                        0.22
P95 TPOT (ms):                           13.69
P99 TPOT (ms):                           15.01
---------------Inter-token Latency----------------
Mean ITL (ms):                           1.63
Median ITL (ms):                         0.00
P95 ITL (ms):                            13.50
P99 ITL (ms):                            14.78
==================================================