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[GH-ISSUE #10968] Qwen3 increases context to 64k, four GPUs, why is the proportion only 67%, CPU is 33%? #69286
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opened 2026-05-04 17:39:51 -05:00 by GiteaMirror
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Originally created by @Jin8999 on GitHub (Jun 4, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/10968
What is the issue?
Or, to put it another way, why does the 35G model pulled from the Olama official website run at 148G after adding context?
Modify Modelfile:
PARAMETER num_ctx 65536
ollama ps:
nvidia-smi:
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@rick-github commented on GitHub (Jun 4, 2025):
Because you added context. 35G is the size of the model weights. Think of it as the size of a program that you want to run, eg
viornano. When you run the program, the program needs space to store what it's working on. For the editor, that's RAM. For a model, that's context. More context, more VRAM/RAM needed.Some other issues from the log. You haven't included a full log so it's hard to say for sure, but it's possible that you've mis-understood the purpose of
num_gpu. It's not for the number of GPUs, but for the number of layers to offload to the GPU. You normally don't have to set this, ollama will estimate it on its own.Also you've set the context to 65536 but the model only supports a context of 40960.
@wingraver commented on GitHub (Jun 4, 2025):
@rick-github hi there. You haven't actually answered the question from the OP. I don't fully understand the maths of adding context but loading a 35G model and getting a size four times larger (148G) doesn't add up to me. There's been a number of these types of tickets raised on here... something's not right. How did Ollama decide to allocate 148G for the stated context... is there some formula that is being used?
@rick-github commented on GitHub (Jun 4, 2025):
As I mentioned, the log is incomplete. Better data, better analysis.
Yes, as shown here:
0943001193/fs/ggml/ggml.go (L426)Broadly speaking,
VRAM_{required} = size_{model weights} + size_{graph} * size_{parallel}size_{graph}depends on the architecture, but is roughly proportional tosize_{graph} = size_{batch} * size_{embedding} * size_{heads} * context_{length}size_{graph}is also non-linear oncontext_{length}, depending onmaxof various values.If there is more than one device, the weights are partitioned over the available devices but the memory graph is duplicated per device. So you get the situation where splitting a model across multiple devices consumes more VRAM than hosting the model on a single device.
Because of the permutations of model architecture, device allocation, head count, embedding and vocab sizes, etc, the memory estimation is sometimes inaccurate. This can be exacerbated when additional memory modifiers like flash attention and KV cache quantization are thrown in the mix. This is why setting
num_gpuis a common way of taking ollama's initial estimate and fine tuning it to maximize VRAM usage. Recent changes to ollama memory estimation logic have been made to compute the worst case memory graph in an effort to reduce runner OOMs, which results in estimations fluctuating version to version as the code is adjusted.@dan-and commented on GitHub (Jun 4, 2025):
@rick-github thanks for explaining it. I never thought about that the memory graph needs to duplicated to all gpus. This explains why patch of grouping gpus instead of spreading over all available devices ( MR https://github.com/ollama/ollama/pull/10678 ) also changed the allocated memory.
@rick-github commented on GitHub (Jun 4, 2025):
Yes, I quite like the work you did in #10678, I would like see it (or some version of it) merged.
@Jin8999 commented on GitHub (Jun 5, 2025):
Thank you for your reply,I don't think I set num_gpu, I just specified the CUDA_VISIBLEDEVICES parameter during runtime. Additionally, on the Qwen3 official website, it is supported to expand the context up to 128K. For the question I raised, not only increasing the context, but also reducing it will still make the model larger than before. @rick-github
@rick-github commented on GitHub (Jun 5, 2025):
A complete log would facilitate more in-depth analysis.
@ccebelenski commented on GitHub (Jun 5, 2025):
Yeah, the new-ish memory estimator is fairly pessimistic - I get it that in a mixed-card setup it's going to be weird, but in a more homogeneous setup I think it might be able to do better. Right now it pretty much forces me to create a parameterized version from a model file to optimize it because the guess ollama makes is so bad. I was tripped up on the fact that 4x cards with 8GB context each is 32GB estimated, causing a lot of layers forced back to the CPU even though it would fit fine.
@rick-github commented on GitHub (Jun 5, 2025):
@ccebelenski If you can provide logs it may help in finetuning the estimation logic.
@ccebelenski commented on GitHub (Jun 5, 2025):
@rick-github Absolutely. Here's an example I think fits. There's plenty of VRAM available still, I haven't forced the layers to load with num_gpu here (it will if I force it, and it fits fine with that context size), yet it didn't offload all the layers to the GPU.
ollama ps reports:
NAME ID SIZE PROCESSOR UNTIL
hf.co/bartowski/DeepSeek-R1-Distill-Qwen-32B-GGUF:Q8_0 86350117bdb0 74 GB 12%/88% CPU/GPU 59 minutes from now
which is kind of non-intuitive from my perspective for the purposes of estimation while probably technically being correct if you add everything up.
ollama-memory.txt
@rick-github commented on GitHub (Jun 5, 2025):
@ccebelenski Can you add the earlier part of the log where it shows estimations?
@ccebelenski commented on GitHub (Jun 5, 2025):
@rick-github yeah, sorry _ cut it off accidentally
ollama-memory2.txt
.
@dan-and commented on GitHub (Jun 5, 2025):
I don't want to hijack this issue, but your issue @ccebelenski is addressed by my merge-request at #10678 . I have memory examples included, where you can see that spreading over 4 GPUs adds up so much overhead and grouping the GPUs helps with reducing the overhead and adding speed (less PCIe communication).
@ccebelenski commented on GitHub (Jun 5, 2025):
Absolutely - I've read your merge-request so I hope this adds to the urgency of moving this along @dan-and . I also hope we can revisit the memory estimation process (yet again) - It's not in a good place right now with it blowing up VRAM requirements to avoid an OOM. The loader should have everything it needs to get really close if it's smart enough so we wouldn't need to add the padding. I'm not familiar with the code myself, or I would take a deeper look, and obviously I know I'm probably being a bit naive or it would have been addressed better the first time. I suspect it might need some kind of "look ahead" based on how I think it's doing the setup in memory - it seems multi-stage which makes sense given the split between context space and model space but perhaps it just needs to optimize it a bit more or fine-tune the buffer space we're adding or make it smarter when the model is split somehow. (As an aside - I've wondered if it's possible to prioritize offload - for example bias weights to GPU when context would normally overflow?)
@Jin8999 commented on GitHub (Jul 4, 2025):
My problem is still not solved. Now that I have expanded the model from 40k to 50k, why does it still occupy CPU with enough GPU?
@rick-github commented on GitHub (Jul 4, 2025):
A complete log would facilitate more in-depth analysis.