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Thought I'd post a small recipe because a lot of threads ask similar things.
Maybe useful as a starting point: MLX on GB200, keeping prefill/decode split in mind from the start.
Feel free to tear it apart if you see something dumb.
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I'd approach it in a boring order. If you're on Ollama, I'd confirm the version first and then reduce variables until the behavior is obvious. A lot of these threads end up being one bad config plus a pile of conclusions drawn from it.
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I hit almost the same issue last night.
trying not to rebuild again
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Can you fill in a bit more context? Is this local-only or are you routing anything externally?
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Not sure I agree there. I get why that seems right, but on dual 3090 the bottleneck felt elsewhere. Could be a workload difference, but I wouldn't generalize too fast from one setup.
throughput matters, but tail latency matters too
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Ran a quick check on my box. On Threadripper box with vLLM, I saw basically the same behavior. I expected the model choice to matter more than it did.
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My first guess would be this: Start by verifying the driver/runtime combo, then test with a smaller prompt, then look at token cost. A lot of these threads end up being one bad config plus a pile of conclusions drawn from it.