README.md

metadata

license: mit
base_model: zai-org/GLM-5.3-Flash
tags:
  - dgx-spark
  - gb10
  - sm121
  - sglang
  - speculative-decoding
  - dflash2
  - nvfp4
  - recipe

GLM-5.3-Flash + DFlash2 on 2× NVIDIA DGX Spark (GB10) — SGLang TP=2 recipe

Hey — I'm one of the folks running DGX Sparks at home, and this community's recipes are the only reason my cluster works at all. tonyd2wild's GB10 forensics, MiaAI-Lab's dual-Spark configs, hasso5703's DFlash2 writeup, LibertAIDAI's quant card — I've leaned on all of them, so here's mine back.

This is GLM-5.3-Flash with the incoai DFlash2 drafter on the SGLang path (the PR #36507 branch everyone will get by default once it merges). Getting it to boot on GB10 took a night and four fixes nobody had written down yet — they're all here with patches and probes, so your bring-up should take an hour instead. If you hit something new, open an issue and I'll dig in with you.

Measured (warmed, temp 0, stream:false, 800 tok, n=5 medians, stock clocks)

prompt	DFlash2 ON	no-spec same stack	speedup
code	27.6 tok/s	14.7	1.88×
prose	20.7 tok/s	14.7	1.41×

Accept length 3.65–5.62 (of 9/step) during code decode. First-light envelope (ctx 65536); overnight optimization ladder in progress — numbers will improve, watch the GitHub repo.

Not claiming bit-identical greedy outputs yet (1 near-tie token flip in a 5-prompt temp-0 on/off comparison; full matrix queued).

The four GB10 day-0 fixes (patches in patches/)

1. SGLANG_HOST_IP must be set per-rank or multi-node shm_broadcast hangs forever
2. DFLASH×hybrid-KDA memory law: mamba pool needs per_req×(1+D) + ~5× per-request amplification
3. DSA tilelang smem overflow at the 8-token verify shape (169,984 B > sm_121's 101,376 B) — retune to block_I=32, num_stages=1, threads=128
4. residual=None crash in the DFLASH capture adapter during CUDA graph capture — fixed upstream in sglang #36755 (merged 2026-08-28, same idiom as our guard; images built from aa8c950a3+ carry the official fix)