Gemma 4 26B-A4B · vLLM · NVFP4 + MTP · conc 2
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 | 137.9 |
|---|---|
| Decode tok/s | 97.86 |
| Peak memory (GB) | 108.86 (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 2 400 400 256 \
--speculative-config '{"method":"mtp","model":"google/gemma-4-26B-A4B-it-assistant","num_speculative_tokens":3}'
# 170/400 prompts (hit the time cap), 0 errors, 401.0s. ready after 337s. TTFT median 165.1 ms, TPOT median 19.0 ms, req thr 0.424/s.
# SpecDecoding: mean acceptance length 2.72 (2.38-3.10) · avg draft acceptance 57% (46-70%) · per-position ~0.76/0.56/0.40.
Notes
Decode 97.86 tok/s aggregate at concurrency 2. NVFP4 + Google MTP assistant drafter, conc 2 — 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 337 s. - Workload: ShareGPT V3, concurrency 2. 170/400 completed, 0 errors before the 400 s time cap.
- Throughput: decode 97.86 tok/s aggregate, prefill 137.9 tok/s. TTFT median 165.1 ms, TPOT median 19.0 ms, req throughput 0.424/s.
- Spec-decode acceptance: mean acceptance length 2.72 (2.38-3.10) · avg draft acceptance 57% (46-70%) · per-position ~0.76/0.56/0.40 (num_speculative_tokens=3).
- Memory: 108.86 GB = vLLM
--gpu-memory-utilization 0.85reservation, not the model footprint.