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Reference: github-starred/ollama#7966
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Originally created by @somera on GitHub (Aug 20, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/11997
What is the issue?
I have one RTX A4000 with 48GB VRAM. These models:
can both be loaded into VRAM and used in parallel with a small
num_ctx.I'm working with Open WebUI v0.6.22.
I have a small Python project with several files, ~1800 lines in total. When I paste this into my Open WebUI chat with
num_ctx=42000using thegpt-oss:20bmodel, everything works fine. The review is generated, and no other models are loaded into VRAM.However, when I use
qwen3-coder:30b, then both models remain loaded in VRAM with the status "4 minutes from now".When I repeat the test with the ~1800 lines of Python code and
num_ctx=42000, the request is sent to Ollama and starts processing. The memory usage grows with the largernum_ctx.My expectation is that the unused model (
qwen3-coder:30bin this case) would be unloaded automatically so Ollama could finish the job. But instead, Ollama stops working on the prompt because there isn’t enough free VRAM for bothqwen3-coder:30bandgpt-oss:20bwithnum_ctx=42000. I have to wait until the unused model (qwen3-coder:30b) is eventually unloaded from VRAM before the request can be processed again.Is my expectation wrong or is there a bug?
Cause unloading unused models works fine, when the num_ctx is small (4096). I see this when I'm using my preload model script:
Relevant log output
OS
Linux
GPU
Nvidia
CPU
AMD
Ollama version
0.11.5
@jessegross commented on GitHub (Aug 20, 2025):
Can you please post the server logs with OLLAMA_DEBUG=1 set? Does it happen every time with the sequence of events that triggers it?
@somera commented on GitHub (Aug 20, 2025):
@jessegross now I'm off. I'll send the logs tomorrow.
@rick-github commented on GitHub (Aug 20, 2025):
gpt-oss:2ob with a context of 42000 only takes 20G, so there's plenty of room for gpt-oss:20b and qwen3-coder:30b to co-reside in 48G.
Server logs may aid in debugging.
@somera commented on GitHub (Aug 20, 2025):
First run:
But nvi-top shows during processing:
And 74,9% = 35,952GB plus 19GB for
qwen3-coder:30bis more than available 48GB.@rick-github how can you explain this?
@somera commented on GitHub (Aug 20, 2025):
And than ..
the used VRAM frows to ~91-95% and ollama stopped.
In Open WebUI I see this:
And here are the ollama logs:
ollama.log.gz
@somera commented on GitHub (Aug 21, 2025):
How do you mean this question?
I uploaded the logs in the comment above.
@jessegross commented on GitHub (Aug 21, 2025):
The main thing that I see in the logs is the runner crashing with OOM:
It notices that pretty much immediately when the next request comes in and tries to reload the model:
Aug 21 01:04:27 AI-DEV-VM-Neptun ollama[3864382]: time=2025-08-21T01:04:27.515+02:00 level=DEBUG source=sched.go:154 msg=reloading runner.name=registry.ollama.ai/library/gpt-oss:20b runner.inference=cuda runner.devices=1 runner.size="18.8 GiB" runner.vram="18.8 GiB" runner.parallel=1 runner.pid=3868900 runner.model=/usr/share/ollama/.ollama/models/blobs/sha256-b112e727c6f18875636c56a779790a590d705aec9e1c0eb5a97d51fc2a778583 runner.num_ctx=42000However, it also wants to check that any previously used VRAM has been released before it calculates offloading. Unfortunately, since the runner crashed, the VRAM has already been released and it doesn't see any change until it times out:
Aug 21 01:04:32 AI-DEV-VM-Neptun ollama[3864382]: time=2025-08-21T01:04:32.862+02:00 level=WARN source=sched.go:652 msg="gpu VRAM usage didn't recover within timeout" seconds=5.346907911 runner.size="18.8 GiB"After the timeout, it takes another 4 seconds to reload the model:
Aug 21 01:04:37 AI-DEV-VM-Neptun ollama[3864382]: time=2025-08-21T01:04:37.126+02:00 level=INFO source=server.go:1272 msg="llama runner started in 4.07 seconds"Now it can begin actually processing that request, which takes 5 seconds:
Aug 21 01:04:42 AI-DEV-VM-Neptun ollama[3864382]: [GIN] 2025/08/21 - 01:04:42 | 200 | 15.011479442s | 10.36.201.14 | POST "/api/chat"In total, it took 15 seconds to respond to the new request (plus it looks like the original one took 14 seconds before the crash happened). Does that line up with what you are seeing? Assuming yes, I think that is the cause of the delay rather than anything to do with waiting for qwen3 to unload. The timeline for a model to be unloaded purely based on its timeout is generally minutes. In this case, the main influence of the additional models and longer context length is to increase memory pressure, triggering the crash in the first place.
@somera commented on GitHub (Aug 21, 2025):
The growing VRAM usage can you see here. And the crash too.
But this kills the API call from Open WebUI.
Is this than an Ollama bug or is there a property to configure this?
@somera commented on GitHub (Aug 21, 2025):
In my real case it consumes 74,9% = 35,952 GB for
gpt-oss:20bwithnum_ctx=42000.plus 19GB for qwen3-coder:30b is more than the available 48GB VRAM.
@jessegross commented on GitHub (Aug 21, 2025):
It's an Ollama bug but you probably can work around it by setting OLLAMA_FLASH_ATTENTION=1. (I recommend upgrading to 0.11.6 if you do this).
@somera commented on GitHub (Aug 21, 2025):
@jessegross thanks for the analysis. I updated today to 0.11.6 and I can set the setting.
@somera commented on GitHub (Aug 21, 2025):
@jessegross is set and it looks good.
Is the setting
OLLAMA_FLASH_ATTENTION=1for temporary use?@jessegross commented on GitHub (Aug 21, 2025):
Glad to hear that it is working.
We're probably going to turn on OLLAMA_FLASH_ATTENTION by default for gpt-oss in the next release or so. This is for reasons unrelated to this bug (it's faster and it saves memory). gpt-oss is particularly impacted by the issue you saw here, so it will help mitigate that as well.
We would still like to fix the underlying issue but that will take longer. There's already a existing bug for this, so I am going to close this one now that we know it is the same issue. Thanks for your help in tracking it down.
@somera commented on GitHub (Aug 25, 2025):
@jessegross can
OLLAMA_FLASH_ATTENTION=1have performance issues?@jessegross commented on GitHub (Aug 25, 2025):
I'm not aware of performance issues with gpt-oss. For other models, it should generally improve performance but it's hard to make a blanket statement. What are you seeing?
@somera commented on GitHub (Aug 26, 2025):
@jessegross a team member has performance issues with deepseek-coder-v2:16b with VS Code + Continue plugin and code autocompletion. I want to look at this.
@jessegross commented on GitHub (Aug 26, 2025):
deepseek-coder-v2:16b doesn't support flash attention and it is automatically disabled, so you shouldn't see any performance difference regardless of that setting:
time=2025-08-26T09:46:04.715-07:00 level=WARN source=server.go:204 msg="flash attention enabled but not supported by model"@somera commented on GitHub (Aug 26, 2025):
@jessegross thx at the moment. If I find anything, I'll open an issue.
@somera commented on GitHub (Sep 9, 2025):
@jessegross just fyi ... the continue plugin for VS Code is the problem. We can reproduce it -> https://github.com/continuedev/continue/issues/5055
Ollama works fine!