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+--- Thread: speculative decoding in llama.cpp (/showthread.php?tid=1106)
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speculative decoding in llama.cpp - vrambandit - 10-13-2026
Did a bit of testing and thought I'd post the result here.
After a few runs on GB200, I ended up with decent performance, but the setup only really made sense once I adjusted around MoE serving.
Curious if anyone else landed in the same place.
My use case is pretty ordinary: local chat, some document work, and occasional batch jobs.
Re: speculative decoding in llama.cpp - localpatch78 - 10-14-2026
I don't think that's the whole story. I wouldn't optimize around that first. On my side the bigger swing came from the runtime and not the model. Could be a workload difference, but I wouldn't generalize too fast from one setup.
There are a few different conversations hiding inside this thread, so being explicit about the goal helps.
Re: speculative decoding in llama.cpp - embershed99 - 10-17-2026
Quote:I don't think that's the whole story. I wouldn't optimize around that first. On my side the bigger swing came from the runtime and not the model. Coul
Ran a quick check on my box. I couldn't reproduce the slowdown until I pushed context much higher. The surprise was that memory pressure showed up before throughput collapsed.
Re: speculative decoding in llama.cpp - mellowwire98 - 10-17-2026
I don't think that's the whole story. I get why that seems right, but on dual 3090 the bottleneck felt elsewhere.
Re: speculative decoding in llama.cpp - dockridge - 10-17-2026
A couple things I'd check first. On dual 3090, the easiest win is often to back off the aggressive settings and see whether the problem survives.
Re: speculative decoding in llama.cpp - mangotinker73 - 10-17-2026
worth checking the driver first.
Re: speculative decoding in llama.cpp - mellowwire98 - 10-18-2026
same here on my side.
Re: speculative decoding in llama.cpp - thetagrid15 - 10-18-2026
I'd approach it in a boring order. Start by verifying the driver/runtime combo, then test with a smaller prompt, then look at reranking. Not glamorous advice, but repeatable baselines save a lot of time.
Re: speculative decoding in llama.cpp - thetagrid15 - 10-18-2026
Quote:I hit almost the same issue last night.
subscribed, curious where this lands.
Re: speculative decoding in llama.cpp - mellowwire98 - 10-18-2026
I tested this tonight. The issue went away once I changed one setting and restarted the stack cleanly.