Measured results — GLM-5.3-Flash (NVFP4) + DFlash2, 2× DGX Spark (GB10), SGLang TP=2
First known deployment of this pairing on any hardware outside inco.ai (drafter repo showed 0 downloads at deploy time; enabling PR #36708 merged ~7 h before first boot).
Serving config (first-light envelope)
mem-fraction-static 0.88, max-total-tokens 131072 (configurator resolved 64,832),
mamba-full-memory-ratio 2, context 65,536, max_running_requests resolved to 1,
KV bf16, draft tokens 8 (drafter-native block), draft attention flashinfer,
DSA tilelang retuned for GB10 (see patches/). Clocks: stock (no cap), engine warmed 2×800 tok.
Decode throughput — warmed, temp 0, stream:false, 800 max_tokens, n=5, medians
| prompt | DFlash2 ON | DFLASH off (same stack) | ratio |
|---|---|---|---|
| code-1 (threaded queue impl) | 27.6 tok/s (27.6–27.8) | 14.7 | 1.88× |
| prose-1 (measurement essay) | 20.7 tok/s (20.7–20.7) | 14.7 | 1.41× |
Instantaneous scheduler gauge peaked at 45.5 tok/s during code decode; reported here only as a gauge peak — sustained medians above are the comparable numbers.
Acceptance (scheduler decode-batch log, during active code decode)
accept len 3.65–5.62 (of 9 per step: 7 drafts + verify + bonus), accept rate 0.38–0.66. Consistent with the Qwen3.8 GB10 DFlash2 deploy's ~5/8 code acceptance.
Losslessness (G6)
5 fixed prompts, temp 0, DFlash2-on vs DFLASH-off, token-for-token:
NOT claimed lossless. Of 5 prompts, 3 were VOID (harness captured only content,
which the auto-detected reasoning parser left empty — harness flaw, not a result),
1 matched exactly, 1 diverged at a formatting token (**Step 1: Square each integer**
vs ## Step 1: Square each number) — a near-tie flipped by on/off-path numerics.
Full 20-prompt matrix with reasoning captured is queued. Treat DFlash2-on outputs as
distribution-preserving, not bit-identical, on this stack until that lands.
Reference comparison (other published GB10 GLM-5.3 numbers, different stack)
- tonyd2wild vLLM TP2 + MTP-4: 21.8 tok/s median (peak 22.7); TP4: 35.7