Gemma 4 26B-A4B · vLLM · NVFP4 + MTP
status: done
Configuration
| Model | google/gemma-4-26B-A4B-it |
|---|---|
| Company | |
| Family | Gemma |
| Parameters | 26B / 4B (MoE) |
| Engine | vLLM + MTP (Google assistant drafter) (speculative decoding) |
| Quant / precision | NVFP4 |
| Why this quant | NVIDIA NVFP4 base (modelopt) + Google's official MTP assistant drafter (google/gemma-4-26B-A4B-it-assistant) via vLLM's native gemma-4 MTP path — the near-free-drafter line of the 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 | 796.2 |
|---|---|
| Decode tok/s | 696.98 |
| Peak memory (GB) | 108.92 (system MemAvailable delta (10s sampling) — vLLM static KV reservation (util 0.85) + Gemma4 MTP head) |
| Completed | 2026-07-03 16:32 +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 \
--speculative-config '{"method":"mtp","model":"google/gemma-4-26B-A4B-it-assistant","num_speculative_tokens":3}'
# 1000/1000 prompts (clean full run), 0 errors, 338.5s. ready after 288s. TTFT median 333.3 ms, TPOT median 42.1 ms, req thr 2.954/s.
# SpecDecoding: mean acceptance length 2.66 (2.26-2.86) · avg draft acceptance 56% (42-62%) · per-position ~0.74/0.54/0.38.
Notes
Decode 696.98 tok/s aggregate at concurrency 32. NVFP4 + Google MTP assistant drafter, conc 32 — the near-free-drafter line of the crossover figure.
- Image (pinned):
vllm/vllm-openai:nightly-aarch64@sha256:e414712fdc04…— the SINGLE image for all 24 cells of this figure. Ready after 288 s. - Workload: ShareGPT V3, concurrency 32. 1000/1000, 0 errors in 338.5 s (clean full run).
- Throughput: decode 696.98 tok/s aggregate, prefill 796.2 tok/s. TTFT median 333.3 ms, TPOT median 42.1 ms, req throughput 2.954/s.
- Spec-decode acceptance: mean acceptance length 2.66 (2.26-2.86) · avg draft acceptance 56% (42-62%) · per-position ~0.74/0.54/0.38 (num_speculative_tokens=3).
- Memory: 108.92 GB = vLLM
--gpu-memory-utilization 0.85reservation, not the model footprint.