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Did a bit of testing and thought I'd post the result here.
I tried this with Phi using PyTorch on GB200. The headline result was better than I expected, but small local stacks still ended up being the limiting factor.
Nothing scientific here, just practical notes from a real setup.
This is mostly for local work rather than public serving.
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A couple things I'd check first. Start by verifying the driver/runtime combo, then test with a smaller prompt, then look at small local stacks.
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A couple things I'd check first. If you're on MLX, I'd confirm the version first and then reduce variables until the behavior is obvious.
mostly local
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Tried to reproduce it just now. I couldn't reproduce the slowdown until I pushed context much higher. I expected the model choice to matter more than it did.
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Tried to reproduce it just now. My result was mixed: first run looked bad, second run looked normal. I expected the model choice to matter more than it did.
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Ran a quick check on my box. The issue went away once I changed one setting and restarted the stack cleanly.
learning in public
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I think the bottleneck is somewhere else. I get why that seems right, but on B200 the bottleneck felt elsewhere. Not saying you're wrong, just that I wouldn't lock that in as the lesson yet.
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Good point. I don't think your conclusion is far off.