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[GH-ISSUE #9730] Gemma 3 12b uses 24 GB VRAM ??? | Flash Attention | KV Cache Quantization #68418
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opened 2026-05-04 13:53:19 -05:00 by GiteaMirror
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Originally created by @ALLMI78 on GitHub (Mar 13, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/9730
Originally assigned to: @mxyng on GitHub.
What is the issue?
I'm experiencing problems when running the Gemma-3-12b (Q4_K_M ~ 8.1GB ) model in Ollama.
Current Configuration: (from https://github.com/ollama/ollama/issues/8597#issuecomment-2614533288)
PROBLEM:
After reading https://smcleod.net/2024/12/bringing-k/v-context-quantisation-to-ollama/#interactive-vram-estimator i checked the VRAM configurator and entered the corresponding parameters there; in fact, a 12B model with a 32k context should never be using that much VRAM, right?
Example with a Qwen-14b-Q4_K_M (OLLAMA_KV_CACHE_TYPE q8_0) >>> VRAM 13 GB >>> 100% GPU >>> runs fine
I'm curious why Qwen-14b (even with OLLAMA_KV_CACHE_TYPE=f16) runs without issues and can comfortably operate with a 32k context on my GPU, while Gemma-3-12b (which actually has fewer parameters) requires significantly more VRAM.
Please specify which parts of the logs (e.g., GPU memory allocation messages, offload logs, or any errors) are relevant?
Thank you for your support!
OS Windows
GPU Nvidia
CPU Intel
Ollama version 0.6.0
@mbretter commented on GitHub (Mar 14, 2025):
On my system I can load gemma3 1b/4b/12b simultaneously on the Tesla T4/16GB:
nvidia-smi:
@mbretter commented on GitHub (Mar 14, 2025):
My first impression is that the gemma3 models are doing pretty well and fast:
Many of the other models are stumbling over this prompts while taking more resources.
@ALLMI78 commented on GitHub (Mar 14, 2025):
Did you checked it with Context Size: 32k ???
I can download it again and post some more information...
@mbretter commented on GitHub (Mar 14, 2025):
nope, just with defaults
@ALLMI78 commented on GitHub (Mar 14, 2025):
With the default settings, you might not notice the issue. I observed VRAM requirements of around 22–23 GB when running Gemma 3 with a 32k context and the default
OLLAMA_KV_CACHE_TYPE=f16.In comparison, Qwen-14B (also with
f16and a 32k context) only uses around 16–17 GB of VRAM.Trying to reduce the VRAM usage by setting
OLLAMA_KV_CACHE_TYPE=q8_0for Gemma 3 didn’t help either, as it became very slow—the model suddenly shifted a significant portion of the workload to the CPU.@Asher9971 commented on GitHub (Mar 14, 2025):
Same here. Using Flash Attention with Gemma3 -> 10% GPU usage 100% CPU usage
without flash attention in ollama everything works fine.
With llama, qwen or all other models i tried flash attenation was never a problem
@ALLMI78 commented on GitHub (Mar 14, 2025):
I'm currently not sure how OLLAMA_FLASH_ATTENTION affects this as well. Thanks for the hint—I’ll test it later.
OLLAMA_NEW_ENGINE:false ???
whats the default of OLLAMA_NEW_ENGINE?
@ALLMI78 commented on GitHub (Mar 14, 2025):
Ahh OLLAMA_NEW_ENGINE seems to be new, it is false for me....
num_ctx @ 32k via api call...
gemma3:12b 22 GB 28%/72% CPU/GPU Stopping...
RAM usage goes also up, CPU usage is @ 20-30%
It runs but does not answer, it runs forever...
@ALLMI78 commented on GitHub (Mar 14, 2025):
@ALLMI78 commented on GitHub (Mar 14, 2025):
with OLLAMA_FLASH_ATTENTION false
gemma3:12b 22 GB 28%/72% CPU/GPU Stopping...
VRAM 22GB and normal RAM usage goes up by 10 GB, CPU usage is @ 20-30%
It runs but does not answer, it runs into my 5 min timeout...
@ALLMI78 commented on GitHub (Mar 14, 2025):
Driver Version: 572.47 CUDA Version: 12.8
@ALLMI78 commented on GitHub (Mar 14, 2025):
Sorry, but I’m having a bit of trouble following your comments. I’ve noticed that you’ve been very active in other threads as well, but despite the detailed input, I haven’t really been able to find a solution from it. No offense intended—I just prefer a more direct approach instead of trial and error.
For now, I’ve removed Gemma-3 12b, as I couldn’t get it to run properly with a 32k context, while Qwen-14B works flawlessly on my setup.
@ALLMI78 commented on GitHub (Mar 14, 2025):
Hey, I appreciate you taking the time to respond, but honestly, your comments haven’t been very helpful. They often seem quite general or not really relevant to the actual issue.
I’m looking for concrete solutions or at least well-founded insights that can genuinely help—random guesses unfortunately don’t get me any further. Hope you understand.
@wisepmlin commented on GitHub (Mar 14, 2025):
Error: llama runner process has terminated: this model is not supported by your version of Ollama. You may need to upgrade
@ALLMI78 commented on GitHub (Mar 14, 2025):
ollama 0.6.0
@gregbarbosa commented on GitHub (Mar 14, 2025):
For anyone running into issues with Ollama, Gemma, Flash and KV Cache, try out the 0.6.1 pre-release. Previously, gemma3:4b on my M1 Pro was choking on the most mundane 'hello' message and memory usage was skyrocketing. Now it can ingest context and reply as expected.
@ALLMI78 commented on GitHub (Mar 14, 2025):
With Ollama version 0.6.1 and OLLAMA_KV_CACHE_TYPE=q8_0:
you can see the high CPU load here in this example...
@ALLMI78 commented on GitHub (Mar 14, 2025):
With Ollama version 0.6.1 and the default OLLAMA_KV_CACHE_TYPE = f16 it runs @ 100% GPU but again high (24 GB) VRAM usage:
Both examples with 32k context size...
@ALLMI78 commented on GitHub (Mar 14, 2025):
compared to qwen 14b | 32k context size
Ollama version 0.6.1 | default OLLAMA_KV_CACHE_TYPE = f16
runs fine...
@LFd3v commented on GitHub (Mar 14, 2025):
I also have a similar problem here (Linux/Nvidia): gemma3:4b and gemma3:12b use an awful amount of RAM, even if Ollama says it is fully loaded in the GPU:
The 4B seems to run fine here (related to tps, albeit using almost all free RAM), but after just a "hello", the 12B model simply causes Ollama to quit due to OOM.
I have seem something similar with llama3.2-vision, but only when sending an image to the model: from what I have read, the projector uses a different architecture than other models that cannot be loaded using both the GPU and CPU, then for some reason it just use all RAM available when an image needs to be processed and crashes Ollama.
As the gemma3 models above 1B have the projector included in the main GGUF, maybe this is why this happens with gemma3 > 1B?
@ALLMI78 commented on GitHub (Mar 16, 2025):
gemma3: with 8 gb model size for a 12b model i'm @ 24 gb...
16 gb for the 32k context ? + around 10-15 GB ram?
that is normal or not?
how can qwen-14b with 32k do the same with only 16-17 gb?