Speed test matrix
NVIDIA-Nemotron-3-Nano-4B-BF16 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
- Intel Core i7-9700K (8C)
- 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 # 1x RTX 3090 24GB (Zagitta/gpu-unlock), 420 W limit, PCIe Gen3 x16 | Intel Core i7-9700K 8C | 32 GB DDR4 | Ubuntu 24.04.5, NVIDIA driver 580.178.04 vllm serve nvidia/NVIDIA-Nemotron-3-Nano-4B-BF16 --max-model-len 262144 --gpu-memory-utilization 0.94 --max-num-seqs 128 --enable-prefix-caching --trust-remote-code
Prefill
prompt tok/s by context length8K context14K598 ms TTFT
16K context13.3K1,251 ms TTFT
32K context12.4K2,672 ms TTFT
64K context10.6K6,226 ms TTFT
128K context8,23616,004 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 | 105.929 ms TTFT | 205.232 ms TTFT | 389.367 ms TTFT | 703.286 ms TTFT | 1,178.1144 ms TTFT | 1,831.5203 ms TTFT | 2,579.8358 ms TTFT | Over capacity |
| 16K | 102.163 ms TTFT | 193.279 ms TTFT | 363.9114 ms TTFT | 625.2187 ms TTFT | 962.3341 ms TTFT | 1,400.7689 ms TTFT | Over capacity | Over capacity |
| 32K | 99.1171 ms TTFT | 183.9220 ms TTFT | 342.2324 ms TTFT | 555.2548 ms TTFT | 784.21,024 ms TTFT | Over capacity | Over capacity | Over capacity |
| 64K | 93.5217 ms TTFT | 166.6284 ms TTFT | 306.8406 ms TTFT | 461.2622 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity |
| 128K | 84.1299 ms TTFT | 140.3398 ms TTFT | 253.1615 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 248K | 70.5656 ms TTFT | 108.1922 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
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 | 14K | — | 598 ms | — | — | 1 | — | — |
| Prefill | 16K | 1 | Valid | 13.3K | — | 1,251 ms | — | — | 1 | — | — |
| Prefill | 32K | 1 | Valid | 12.4K | — | 2,672 ms | — | — | 1 | — | — |
| Prefill | 64K | 1 | Valid | 10.6K | — | 6,226 ms | — | — | 1 | — | — |
| Prefill | 128K | 1 | Valid | 8,236.0 | — | 16,004 ms | — | — | 1 | — | — |
| Sustained decode | 0 | 1 | Valid | 105.9 | 106.0 | 29 ms | 9.4 ms | 1.0 | 0 | 3,177 | 30.0 s |
| Sustained decode | 0 | 2 | Valid | 205.2 | 102.7 | 32 ms | 9.7 ms | 2.0 | 0 | 6,153 | 30.0 s |
| Sustained decode | 0 | 4 | Valid | 389.3 | 97.5 | 67 ms | 10.3 ms | 4.0 | 0 | 11,680 | 30.0 s |
| Sustained decode | 0 | 8 | Valid | 703.2 | 88.4 | 86 ms | 11.3 ms | 8.0 | 0 | 21,097 | 30.0 s |
| Sustained decode | 0 | 16 | Valid | 1,178.1 | 74.0 | 144 ms | 13.5 ms | 16.0 | 0 | 35,344 | 30.0 s |
| Sustained decode | 0 | 32 | Valid | 1,831.5 | 57.5 | 203 ms | 17.4 ms | 32.0 | 0 | 54,947 | 30.0 s |
| Sustained decode | 0 | 64 | Valid | 2,579.8 | 40.5 | 358 ms | 24.7 ms | 64.0 | 0 | 77,376 | 30.0 s |
| Sustained decode | 0 | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 1 | Valid | 102.1 | 102.2 | 63 ms | 9.8 ms | 1.0 | 0 | 3,063 | 30.0 s |
| Sustained decode | 16K | 2 | Valid | 193.2 | 96.6 | 79 ms | 10.3 ms | 2.0 | 0 | 5,795 | 30.0 s |
| Sustained decode | 16K | 4 | Valid | 363.9 | 91.0 | 114 ms | 11.0 ms | 4.0 | 0 | 10,916 | 30.0 s |
| Sustained decode | 16K | 8 | Valid | 625.2 | 78.1 | 187 ms | 12.8 ms | 8.0 | 0 | 18,752 | 30.0 s |
| Sustained decode | 16K | 16 | Valid | 962.3 | 59.9 | 341 ms | 16.7 ms | 16.0 | 0 | 28,871 | 30.0 s |
| Sustained decode | 16K | 32 | Valid | 1,400.7 | 43.7 | 689 ms | 22.9 ms | 32.0 | 0 | 42,016 | 30.0 s |
| Sustained decode | 16K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 1 | Valid | 99.1 | 99.1 | 171 ms | 10.1 ms | 1.0 | 0 | 2,972 | 30.0 s |
| Sustained decode | 32K | 2 | Valid | 183.9 | 91.9 | 220 ms | 10.9 ms | 2.0 | 0 | 5,516 | 30.0 s |
| Sustained decode | 32K | 4 | Valid | 342.2 | 85.4 | 324 ms | 11.7 ms | 4.0 | 0 | 10,265 | 30.0 s |
| Sustained decode | 32K | 8 | Valid | 555.2 | 69.1 | 548 ms | 14.5 ms | 8.0 | 0 | 16,656 | 30.0 s |
| Sustained decode | 32K | 16 | Valid | 784.2 | 48.6 | 1,024 ms | 20.6 ms | 16.0 | 0 | 23,520 | 30.0 s |
| Sustained decode | 32K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 64K | 1 | Valid | 93.5 | 93.5 | 217 ms | 10.7 ms | 1.0 | 0 | 2,803 | 30.0 s |
| Sustained decode | 64K | 2 | Valid | 166.6 | 83.4 | 284 ms | 12.0 ms | 2.0 | 0 | 4,998 | 30.0 s |
| Sustained decode | 64K | 4 | Valid | 306.8 | 76.5 | 406 ms | 13.1 ms | 4.0 | 0 | 9,204 | 30.0 s |
| Sustained decode | 64K | 8 | Valid | 461.2 | 56.9 | 622 ms | 17.6 ms | 8.0 | 0 | 13,832 | 30.0 s |
| 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 | 84.1 | 84.2 | 299 ms | 11.9 ms | 1.0 | 0 | 2,521 | 30.0 s |
| Sustained decode | 128K | 2 | Valid | 140.3 | 70.3 | 398 ms | 14.2 ms | 2.0 | 0 | 4,208 | 30.0 s |
| Sustained decode | 128K | 4 | Valid | 253.1 | 63.2 | 615 ms | 15.8 ms | 4.0 | 0 | 7,592 | 30.0 s |
| 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 | Valid | 70.5 | 70.7 | 656 ms | 14.2 ms | 1.0 | 0 | 2,114 | 30.0 s |
| Sustained decode | 248K | 2 | Valid | 108.1 | 54.2 | 922 ms | 18.5 ms | 2.0 | 0 | 3,242 | 30.0 s |
| 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 | — | — | — | — | — | — | — | — |
Over capacity: not run because this many requests at this context would exceed the server's KV cache.