Speed test matrix
Tess-4-9B on RTX 3090 24GB
vllm · 0.32.0 · BF166 contexts (0–248K) × 8 concurrency levels (1–128) · prefill at 8K, 16K, 32K, 64K, 128K
Hardware
- Type
- Discrete GPU
- GPU
- RTX 3090
- VRAM
- 24 GB
- CPU
- AMD Ryzen 9 7900X (12C)
- RAM
- 32 GB
- OS
- Ubuntu 24.04.5
Engine
- Engine
- vllm
- Version
- 0.32.0
- Quantization
- BF16
- Backend
- cuda
- Repository
- github.com/vllm-project/vllm
- Build
- vllm/vllm-openai:v0.32.0-x86_64
Run
- Served model
- bench
- Revision
- main
- Benchmark tool
- llm-inference-bench v0.8.0
- Decode test
- Fixed duration
- Prefill mode
- Measured during decode warm-up
- Time per measurement
- 30 s
- Max output
- 8,192 tokens
Launch command
# Untuned out-of-the-box baseline. Spec decode: none. KV cache: int4_per_token_head # 1x RTX 3090 24GB (Zagitta/gpu-unlock), 350 W limit (VBIOS max), PCIe Gen4 x16 | AMD Ryzen 9 7900X 12C | 32 GB DDR5 | Ubuntu 24.04.5, NVIDIA driver 595.99.02 vllm serve migtissera/Tess-4-9B --max-model-len 262144 --gpu-memory-utilization 0.94 --max-num-seqs 128 --enable-prefix-caching --trust-remote-code --language-model-only --kv-cache-dtype int4_per_token_head --attention-backend TRITON_ATTN
Prefill
prompt tok/s by context length8K context5,8021,412 ms TTFT
16K context5,0053,241 ms TTFT
32K context3,9158,249 ms TTFT
64K context2,71523,727 ms TTFT
128K context1,69475,960 ms TTFT
Sustained decode
total tok/s · rows are context length, columns are simultaneous requests| Context | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 |
|---|---|---|---|---|---|---|---|---|
| 0 | 48.639 ms TTFT | 95.257 ms TTFT | 187.490 ms TTFT | 368.8144 ms TTFT | 684.8223 ms TTFT | 1,165.5362 ms TTFT | Over capacity | Over capacity |
| 16K | 45.5503 ms TTFT | 88.1762 ms TTFT | 162.01,269 ms TTFT | 296.42,273 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity |
| 32K | 42.7634 ms TTFT | 81.9944 ms TTFT | 141.91,545 ms TTFT | 246.52,783 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity |
| 64K | 38.2663 ms TTFT | 72.0965 ms TTFT | 115.41,560 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 128K | 31.61,969 ms TTFT | 58.22,913 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 248K | 22.0Requests queued3,037 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
Requests queued: the server could not run all requests at once, so some waited in a queue. Over capacity: not run because this many requests at this context would exceed the server's KV cache.
TTFT is measured after the benchmark warms the server's prompt cache, so it mostly excludes prefill.
All measurements
Latencies are medians. Total tok/s is output across all simultaneous requests.| Phase | Context | Requests at once | Status | Total tok/s | Per request tok/s | TTFT | Time between tokens | Average active requests | Completed requests | Output tokens | Measured for |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Prefill | 8K | 1 | Valid | 5,802.0 | — | 1,412 ms | — | — | 1 | — | — |
| Prefill | 16K | 1 | Valid | 5,005.0 | — | 3,241 ms | — | — | 1 | — | — |
| Prefill | 32K | 1 | Valid | 3,915.0 | — | 8,249 ms | — | — | 1 | — | — |
| Prefill | 64K | 1 | Valid | 2,715.0 | — | 23,727 ms | — | — | 1 | — | — |
| Prefill | 128K | 1 | Valid | 1,694.0 | — | 75,960 ms | — | — | 1 | — | — |
| Sustained decode | 0 | 1 | Valid | 48.6 | 48.7 | 39 ms | 20.5 ms | 1.0 | 0 | 1,459 | 30.0 s |
| Sustained decode | 0 | 2 | Valid | 95.2 | 47.6 | 57 ms | 21.0 ms | 2.0 | 0 | 2,856 | 30.0 s |
| Sustained decode | 0 | 4 | Valid | 187.4 | 46.9 | 90 ms | 21.3 ms | 4.0 | 0 | 5,620 | 30.0 s |
| Sustained decode | 0 | 8 | Valid | 368.8 | 46.2 | 144 ms | 21.6 ms | 8.0 | 0 | 11,064 | 30.0 s |
| Sustained decode | 0 | 16 | Valid | 684.8 | 42.9 | 223 ms | 23.3 ms | 16.0 | 0 | 20,544 | 30.0 s |
| Sustained decode | 0 | 32 | Valid | 1,165.5 | 36.5 | 362 ms | 27.4 ms | 32.0 | 0 | 34,944 | 30.0 s |
| Sustained decode | 0 | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 0 | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 1 | Valid | 45.5 | 45.5 | 503 ms | 22.0 ms | 1.0 | 0 | 1,364 | 30.0 s |
| Sustained decode | 16K | 2 | Valid | 88.1 | 43.7 | 762 ms | 22.9 ms | 2.0 | 0 | 2,640 | 30.0 s |
| Sustained decode | 16K | 4 | Valid | 162.0 | 39.7 | 1,269 ms | 25.2 ms | 4.0 | 0 | 4,856 | 30.0 s |
| Sustained decode | 16K | 8 | Valid | 296.4 | 35.4 | 2,273 ms | 28.3 ms | 8.0 | 0 | 8,888 | 30.0 s |
| Sustained decode | 16K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 1 | Valid | 42.7 | 42.7 | 634 ms | 23.4 ms | 1.0 | 0 | 1,280 | 30.0 s |
| Sustained decode | 32K | 2 | Valid | 81.9 | 40.6 | 944 ms | 24.6 ms | 2.0 | 0 | 2,456 | 30.0 s |
| Sustained decode | 32K | 4 | Valid | 141.9 | 34.6 | 1,545 ms | 28.9 ms | 4.0 | 0 | 4,256 | 30.0 s |
| Sustained decode | 32K | 8 | Valid | 246.5 | 29.1 | 2,783 ms | 34.3 ms | 8.0 | 0 | 7,392 | 30.0 s |
| Sustained decode | 32K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 1 | Valid | 38.2 | 38.2 | 663 ms | 26.2 ms | 1.0 | 0 | 1,146 | 30.0 s |
| Sustained decode | 64K | 2 | Valid | 72.0 | 35.7 | 965 ms | 28.0 ms | 2.0 | 0 | 2,160 | 30.0 s |
| Sustained decode | 64K | 4 | Valid | 115.4 | 28.2 | 1,560 ms | 35.5 ms | 4.0 | 0 | 3,460 | 30.0 s |
| Sustained decode | 64K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 1 | Valid | 31.6 | 31.6 | 1,969 ms | 31.6 ms | 1.0 | 0 | 948 | 30.0 s |
| Sustained decode | 128K | 2 | Valid | 58.2 | 28.4 | 2,913 ms | 35.2 ms | 2.0 | 0 | 1,746 | 30.0 s |
| Sustained decode | 128K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 128K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 1 | Requests queued | 22.0 | 24.0 | 3,037 ms | 41.6 ms | 0.9 | 0 | 660 | 30.0 s |
| Sustained decode | 248K | 2 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 248K | 128 | Over capacity | — | — | — | — | — | — | — | — |
Requests queued: the server could not run all requests at once, so some waited in a queue. Over capacity: not run because this many requests at this context would exceed the server's KV cache.