Gemma 4 26B-A4B · vLLM · NVFP4
status: done
Configuration
| Model | google/gemma-4-26B-A4B-it |
|---|---|
| Company | |
| Family | Gemma |
| Parameters | 26B / 4B (MoE) |
| Engine | vLLM |
| Quant / precision | NVFP4 |
| Why this quant | NVIDIA's own NVFP4 build (TensorRT-Model-Optimizer / modelopt) — Blackwell-native 4-bit. The autoregressive reference line (no drafter) for the decode-vs-concurrency crossover figure. |
| Download | nvidia/Gemma-4-26B-A4B-NVFP4 |
| Context window | 65536 |
| Input modalities | text, image (served text-only here) |
Measured results
| Prefill tok/s | 480.96 |
|---|---|
| Decode tok/s | 421.13 |
| Peak memory (GB) | 108.58 (system MemAvailable delta (10s sampling) — vLLM static KV reservation (util 0.85)) |
| Completed | 2026-07-03 15:15 +0800 |
Full run command
VLLM_IMAGE=vllm/vllm-openai:nightly-aarch64 scripts/bench-vllm-serving.sh nvidia/Gemma-4-26B-A4B-NVFP4 65536 32 1000 900 256
# 1000/1000 prompts (clean full run), 0 errors, 560.3s. ready after 323s. TTFT median 230.5 ms, TPOT median 72.9 ms, req thr 1.785/s.
Notes
Decode 421.13 tok/s aggregate at concurrency 32. Autoregressive NVFP4 reference point, conc 32, for the decode-vs-concurrency crossover figure.
- Image (pinned):
vllm/vllm-openai:nightly-aarch64@sha256:e414712fdc04…— the SINGLE image for all 24 cells of this figure. Ready after 323 s. - Workload: ShareGPT V3, concurrency 32. 1000/1000, 0 errors in 560.3 s (clean full run).
- Throughput: decode 421.13 tok/s aggregate, prefill 480.96 tok/s. TTFT median 230.5 ms, TPOT median 72.9 ms, req throughput 1.785/s.
- Memory: 108.58 GB = vLLM
--gpu-memory-utilization 0.85reservation, not the model footprint.