Speed test matrix
granite-4.2-30b on H200 NVL 141GB
sglang · 0.5.18 · BF165 contexts (8K–123K) × 8 concurrency levels (1–128) · prefill at 8K, 16K, 32K, 64K, 123K, 128K
Hardware
- Type
- Discrete GPU
- GPU
- H200 NVL
- VRAM
- 141 GB
- OS
- linux
Engine
- Engine
- sglang
- Version
- 0.5.18
- Quantization
- BF16
- Backend
- cuda
- Repository
- github.com/sgl-project/sglang
- Build
- cuda-13.2
Run
- Served model
- granite-4.2-30b
- Revision
- main
- Benchmark tool
- llm-inference-bench v0.4.29
- Decode test
- Fixed duration
- Prefill mode
- Measured during decode warm-up
- Time per measurement
- 30 s
- Max output
- 4,096 tokens
Launch command
"$HOME/env_h200-ibm-sglang/bin/sglang" serve --model-path ibm-granite/granite-4.2-30b --served-model-name granite-4.2-30b --tp 1 --reasoning-parser auto --tool-call-parser auto --context-length 131072 --mem-fraction-static 0.851009 --enable-metrics --host 0.0.0.0 --port 8000 --api-key <redacted> --dtype bfloat16
Prefill
prompt tok/s by context length8K context8,556958 ms TTFT
16K context8,2321,969 ms TTFT
32K context7,3784,374 ms TTFT
64K context6,02710,683 ms TTFT
123K context4,44627,799 ms TTFT
128K context4,39129,294 ms TTFT
Sustained decode
total tok/s · rows are context length, columns are simultaneous requests| Context | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 |
|---|---|---|---|---|---|---|---|---|
| 8K | 38.0103 ms TTFT | 58.9112 ms TTFT | 121.8109 ms TTFT | 257.9143 ms TTFT | 504.1196 ms TTFT | Over capacity | Over capacity | Over capacity |
| 16K | 36.3116 ms TTFT | 58.8139 ms TTFT | 110.0160 ms TTFT | 204.4193 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity |
| 32K | 31.6141 ms TTFT | 50.2162 ms TTFT | 96.7243 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 64K | 35.1188 ms TTFT | 44.2273 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 123K | 27.1306 ms TTFT | 33.6421 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 | 8,556.0 | — | 958 ms | — | — | 1 | — | — |
| Prefill | 16K | 1 | Valid | 8,232.0 | — | 1,969 ms | — | — | 1 | — | — |
| Prefill | 32K | 1 | Valid | 7,378.0 | — | 4,374 ms | — | — | 1 | — | — |
| Prefill | 64K | 1 | Valid | 6,027.0 | — | 10,683 ms | — | — | 1 | — | — |
| Prefill | 123K | 1 | Valid | 4,446.0 | — | 27,799 ms | — | — | 1 | — | — |
| Prefill | 128K | 1 | Valid | 4,391.0 | — | 29,294 ms | — | — | 1 | — | — |
| Sustained decode | 8K | 1 | Valid | 38.0 | 38.0 | 103 ms | 26.3 ms | — | 0 | 1,139 | 30.0 s |
| Sustained decode | 8K | 2 | Valid | 58.9 | 29.3 | 112 ms | 34.2 ms | — | 0 | 1,766 | 30.0 s |
| Sustained decode | 8K | 4 | Valid | 121.8 | 30.4 | 109 ms | 32.9 ms | — | 0 | 3,652 | 30.0 s |
| Sustained decode | 8K | 8 | Valid | 257.9 | 32.1 | 143 ms | 31.1 ms | — | 0 | 7,737 | 30.0 s |
| Sustained decode | 8K | 16 | Valid | 504.1 | 31.5 | 196 ms | 31.7 ms | — | 0 | 15,120 | 30.0 s |
| Sustained decode | 8K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 8K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 8K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 1 | Valid | 36.3 | 36.3 | 116 ms | 27.6 ms | — | 0 | 1,087 | 30.0 s |
| Sustained decode | 16K | 2 | Valid | 58.8 | 29.4 | 139 ms | 34.0 ms | — | 0 | 1,762 | 30.0 s |
| Sustained decode | 16K | 4 | Valid | 110.0 | 27.4 | 160 ms | 36.5 ms | — | 0 | 3,296 | 30.0 s |
| Sustained decode | 16K | 8 | Valid | 204.4 | 25.5 | 193 ms | 39.2 ms | — | 0 | 6,128 | 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 | 31.6 | 31.5 | 141 ms | 31.8 ms | — | 0 | 947 | 30.0 s |
| Sustained decode | 32K | 2 | Valid | 50.2 | 25.1 | 162 ms | 39.8 ms | — | 0 | 1,506 | 30.0 s |
| Sustained decode | 32K | 4 | Valid | 96.7 | 24.1 | 243 ms | 41.4 ms | — | 0 | 2,900 | 30.0 s |
| Sustained decode | 32K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| 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 | 35.1 | 35.1 | 188 ms | 28.5 ms | — | 0 | 1,051 | 30.0 s |
| Sustained decode | 64K | 2 | Valid | 44.2 | 22.1 | 273 ms | 45.3 ms | — | 0 | 1,326 | 30.0 s |
| Sustained decode | 64K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| 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 | 123K | 1 | Valid | 27.1 | 27.1 | 306 ms | 36.9 ms | — | 0 | 812 | 30.0 s |
| Sustained decode | 123K | 2 | Valid | 33.6 | 16.8 | 421 ms | 59.5 ms | — | 0 | 1,006 | 30.0 s |
| Sustained decode | 123K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 123K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 123K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 123K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 123K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 123K | 128 | Over capacity | — | — | — | — | — | — | — | — |
Over capacity: not run because this many requests at this context would exceed the server's KV cache.