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[GH-ISSUE #5949] Out of Memory Error when using Meta-Llama-3.1-8B-Instruct-Q8_0.gguf model with Ollama ROCm with num_ctx=120000 #50226
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opened 2026-04-28 14:46:46 -05:00 by GiteaMirror
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Originally created by @renbuarl on GitHub (Jul 25, 2024).
Original GitHub issue: https://github.com/ollama/ollama/issues/5949
Originally assigned to: @dhiltgen on GitHub.
What is the issue?
OS: Linux 6.5.0-44-generic #44~22.04.1-Ubuntu
GPU:
AMD Radeon RX 7900 XTX (24 GiB VRAM)
AMD Radeon RX 7900 XTX (24 GiB VRAM)
AMD Radeon RX 7900 XTX (24 GiB VRAM)
Ollama version: 0.2.8
ROCm module version: 6.7.0
amdgpu-install_6.1.60103-1_all.deb
Model: Meta-Llama-3.1-8B-Instruct-Q8_0
While testing the Meta-Llama-3.1-8B-Instruct-Q8_0.gguf model, I encountered an out of memory error well before reaching the maximum context size of 128k for the model. The model crashes after processing approximately 28,000 tokens, regardless of whether using one GPU with 24GB of memory (nctx = 30,000) or three GPUs with a combined memory of 72GB (nctx = 120,000).
Error:
Jul 25 12:39:17 ailab ollama[683]: CUDA error: out of memory
Jul 25 12:39:17 ailab ollama[683]: current device: 0, in function alloc at /go/src/github.com/ollama/ollama/llm/llama.cpp/ggml/src/ggml-cuda.cu:291
Jul 25 12:39:17 ailab ollama[683]: ggml_cuda_device_malloc(&ptr, look_ahead_size, device)
Jul 25 12:39:17 ailab ollama[683]: GGML_ASSERT: /go/src/github.com/ollama/ollama/llm/llama.cpp/ggml/src/ggml-cuda.cu:101: !"CUDA error"
There might be similar issues, but out of memory errors with multiple GPUs have not been reported yet.
OS
Linux
GPU
AMD
CPU
Intel
Ollama version
0.2.8
@rick-github commented on GitHub (Jul 25, 2024):
Server logs would help with diagnosis. Sounds similar to https://github.com/ollama/ollama/issues/5913, there's a workaround in the comments.
@renbuarl commented on GitHub (Jul 25, 2024):
Very similar to #5913 but for the case of multiple GPUs, while in #5913 it is indeed a workaround as VRAM is genuinely low. In this case, reducing num_gpu is simply offloading to CPU when there are available GPUs and sufficient VRAM. This is an obvious bug.
@rick-github commented on GitHub (Jul 25, 2024):
Server logs would help with diagnosis.
@renbuarl commented on GitHub (Jul 25, 2024):
journal.txt
@dhiltgen commented on GitHub (Jul 26, 2024):
The bug here is likely we're not properly adjusting the prediction for the large context size.
@rick-github commented on GitHub (Jul 26, 2024):
I did a little experiment, loaded the same model multiple times with different versions of ollama. ollama always made the same calculations, but as versions from 0.1.40 to 0.3.0, the VRAM usage from the llama server went from 5156MiB to 5214MiB. Not a lot, but when llama.cpp is using 23.9 of 24G (https://github.com/ollama/ollama/issues/5913), it may be enough to push things over the edge.
@Speedway1 commented on GitHub (Jul 28, 2024):
Just a head's up that the problem of generating garbage with >1 AMD GPUs is still an issue. Something broke a few versions of Ollama ago because it used to work. It's also specific to Ollama because llama.cpp for the same models where VRAM usage >24GB works well, the load it shared across GPUs without any issues. But with Ollama as soon as more than 1 GPU is needed, garbage is produced.
We're still trying to get some helpful information to feed back to the team here to get this fixed but I would set expectations that even if this report OOM is fixed, it's still not going to run across multiple cards successfully. Best to limit to 1 GPU and CPU RAM which seems to work.
ATM we're downgraded our multi-GPU AMD boxes to be multiple Ollamas running on single GPUs separated by port number. E.g. a 2 GPU box will have 2 instances of Ollama runnins, with two different port numbers. Each Ollama instance is strictred to 1 GPU only and of course can use CPU if needed. Run multi-card jobs on NVIDIA which is better supported both at the OS level and within Ollama.
Where we absolutely must use multi-card AMD GPUs, we're using llama.cpp and its' OpenAI API compatible server. Runs across all GPUs no problem provided the it's compiled with the LLAMA_CUDA_NO_PEER_COPY=1 flag. But this means that Ollama's wonderful LLM swapping support is missing, so it ties a machine down to serving that one LLM only. E.g. Llama3 70B. We adjust LLM routing accordingly in this instance.
Hope these comments help. It won't be long before the problems with multi-AMD cards are fixed. Just a matter of getting the correct diagnostics which is elusive at the moment.
@renbuarl commented on GitHub (Jul 30, 2024):
Speedway1, thank you for your message!
However, it seems that the issue is not with ollama, but with llama.cpp.
I built the latest release of llama.cpp #b3488 following the methodology described in
https://github.com/eliranwong/MultiAMDGPU_AIDev_Ubuntu (Thanks to the author!)
git clone https://github.com/ggerganov/llama.cpp
cd llama.cpp
make clean && make -j4 GGML_HIPBLAS=1 AMDGPU_TARGETS=gfx1100
~/llama.cpp/llama-server -v -m /home/user/backups/models/70/Qwen2-72B-Instruct-Q4_K_M.gguf -c 32000 --host '192.168.0.5' --port 8081 -ngl 99
When the real context is more than 10k,
The same error occurs as in ollama:
CUDA error: out of memory
current device: 2, in function alloc at ggml/src/ggml-cuda.cu:291
ggml_cuda_device_malloc(&ptr, look_ahead_size, device)
ggml/src/ggml-cuda.cu:101: CUDA error
@renbuarl commented on GitHub (Jul 30, 2024):
https://github.com/ggerganov/llama.cpp/issues/8766
@Speedway1 commented on GitHub (Jul 30, 2024):
Hi @renbuarl , I think that the problem there is your massive context length. It takes a lot of VRAM. Here is a simple bit of bash that we run when loading up LLMs on AMD to monitor the consumption, it's handy to have open in a window!
while true; do rocm-smi; sleep 1; done
At the moment we have Mixtral Large, quantised to Q2_k running on 2x Radeon 7900 XTX (2x24GB) with the following:
llama.cpp/server -m /home/tmp/Mistral-Large-Instruct-2407_q2_k.gguf -ngl 89 -n 1500 -c 1500 --host 0.0.0.0 --port 2600 -a mistralFor those worried about the security: This is behind a firewall on our Dev VPN hence the open listen.
This is the SMI output:
(Currently the machine is busy as you can see).
This is on llama.cpp. We cannot get Ollama to work across the cards at the moment.
Not sure if any of this is useful to you, but hoping that maybe some of it is.
@renbuarl commented on GitHub (Jul 31, 2024):
Great advice to use the '--flash-attn' option.
~/llama.cpp/llama-server -v -m /home/user/backups/models/70/Qwen2-72B-Instruct-Q4_K_M.gguf -c 65536 --host '192.168.0.5' --port 8081 -ngl 99 --flash-attn
Maximum vram consumption is 68.88 GB with a real context of 32k, and there is no 'CUDA error: out of memory'.
@renbuarl commented on GitHub (Jul 31, 2024):
What do we have?
When launching without the --flash-attn option for llama-server
~/llama.cpp/llama-server -v -m /home/user/backups/models/70/Qwen2-72B-Instruct-Q4_K_M.gguf -c 32768 --host '192.168.0.5' --port 8081 -ngl 99
The average VRAM consumption is 68.40 GB but we crash with 'CUDA error: out of memory' with relatively small actual context.
When launching with the --flash-attn option for llama-server it works perfectly
~/llama.cpp/llama-server -v -m /home/user/backups/models/70/Qwen2-72B-Instruct-Q4_K_M.gguf -c 32768 --host '192.168.0.5' --port 8081 -ngl 99 --flash-attn
The average VRAM consumption is 58.56 GB.
@ott2 commented on GitHub (Aug 1, 2024):
Specifying
--no-kv-offloadbypasses this error for me, even with the default 128K context. Otherwise using context-c 70689or larger results in an out of memory error.Background:
Totally different setup here (M1 Mac, 32GB RAM), but I'm also seeing repeatable memory outs with this model. This happens when the context size goes beyond a threshold value.
In my case
works fine, but changing that to
-c 70689results inWith a word-level diff, the only significant difference I can see in the logs is the pair of lines:
versus
The context window increases the Metal KV buffer size until it hits the mysterious maximum value of 8836MiB as the limit in my case (a bit more than 8GB). Specifying
--no-kv-offloadseems to effectively switch off using the GPU, but at least allows inference to go ahead.@DevElCuy commented on GitHub (Oct 3, 2024):
Just learned today that memory allocation is related to the context size param. Any way to make it dynamic? We are talking about MAX context size so no need to allocate a lot of VRAM that we are hardly ever using
@dhiltgen commented on GitHub (Oct 17, 2024):
@develCuy we're tracking dynamic context size management via #1005