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[GH-ISSUE #4051] Enable Flash Attention on GGML/GGUF (feature now merged into llama.cpp) #28273
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opened 2026-04-22 06:14:17 -05:00 by GiteaMirror
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Originally created by @sammcj on GitHub (Apr 30, 2024).
Original GitHub issue: https://github.com/ollama/ollama/issues/4051
Flash Attention has landed in llama.cpp (https://github.com/ggerganov/llama.cpp/pull/5021).
The tldr; is simply to pass the -fa flag to llama.cpp’s server.
also a related idea - perhaps there could be a way to pass arbitrary flags down to llama.cpp so that hints like this can be easily enabled? (E.g.
OLLAMA_LLAMA_EXTRA_ARGS=-fa,—something-else@DuckyBlender commented on GitHub (Apr 30, 2024):
Are there any cons for using Flash Attention? If not it probably should be the default.
@DuckyBlender commented on GitHub (Apr 30, 2024):
Also if there is more memory available we should really set the default quants to Q4_K_M and fallback to Q4 when Q4_K_M is not available
@jukofyork commented on GitHub (May 1, 2024):
Yeah, I think this would help a lot.
@jukofyork commented on GitHub (May 2, 2024):
Just been looking at the source to see if this can be done:
https://github.com/ollama/ollama/blob/main/llm/ext_server/server.cpp
and even though it's importing the latest
gpt_paramsstructure (from the lamma.cpp submodule dated 2 days ago), all the parsing is using someserver_params_parsefunction stripped from a outdated version of the llama.cpp server.Some of the default values (eg: --repeat-penalty) and even meanings (eg: --batch) are also behind because of this.
I guess we could try to make a diff to see if this can be updated, but since PRs never seem to get accepted and random stuff constantly seems to change regarding the passing of command line options, I'm reluctant to even try...
@sammcj commented on GitHub (May 2, 2024):
I had a hot crack at a PR tonight but as you said @jukofyork it seems server.cpp has diverged from llama.cpp a lot and I couldn't get my head around it.
Might have to wait for someone more familiar with Ollama's version of it / more brains than me.
@sammcj commented on GitHub (May 3, 2024):
FYI: LM Studio added Flash Attention earlier today: https://www.reddit.com/r/LocalLLaMA/comments/1cir98j/lm_studio_released_new_version_with_flash/
@sammcj commented on GitHub (May 3, 2024):
Comparing GGUF performance with/without Flash Attention
Hardware
Model
Request
LM Studio
With Flash Attention
Ollama
Without Flash Attention
@wanderingmeow commented on GitHub (May 3, 2024):
Got it working by adding the
OLLAMA_LLAMA_EXTRA_ARGSenvironment variable inllm/server.goas @sammcj suggested. This allows the-faflag be passed intoext_server/server.cpp. If anyone is interested, my hack can be found here. Hopefully this can help others get Flash Attention working too.@sammcj commented on GitHub (May 3, 2024):
That looks VERY similar to what I tried @wanderingmeow, perhaps I just wasn't parsing the parameters correctly 🤔 , that's awesome!
@sammcj commented on GitHub (May 3, 2024):
That worked instantly, still no where near as fast as LM Studio but it's a start.
@sammcj commented on GitHub (May 3, 2024):
@wanderingmeow I've created a PR with the changes - https://github.com/ollama/ollama/pull/4120
@jukofyork commented on GitHub (May 3, 2024):
Awesome! 👍
@jukofyork commented on GitHub (May 3, 2024):
I wonder if we can extend this:
To use a reg-ex to match against the model name passed in the
modelstring?Then we can just completely bypass the modelfile code and pass model-specific parameters as well? This would save all the hassle of PRs not getting accepted and then breaking because the code all got moved around!
It looks like we could just copy in
server_params_parsefrom the sub-module (possibly automatically using AWK or something) and we would have access to any parameter added tollama.cpp.It probably doesn't want to be split using "," though as that is used by
llama.cppfor some options liketensor-split, etc.@jukofyork commented on GitHub (May 3, 2024):
Something like:
Although I'm not sure if the
modelstring will actually be the name or the weird sha hash name that points to the GGUF file?@wanderingmeow commented on GitHub (May 3, 2024):
From my testing, the current ollama
ext_serverimplementation performs on par with the latestserverexample from llama.cpp, with only a slight slowdown (<1%).@sammcj commented on GitHub (May 3, 2024):
@jukofyork I had a look at this, but it was getting messy, fast.
What I think probably could work is:
That's way out of my ball park though 😅
@jukofyork commented on GitHub (May 4, 2024):
It really helps reduce the VRAM use of long-context models: some I could only run at 16k or 32k are now running with 32k or 64k for the same quant!
@jukofyork commented on GitHub (May 4, 2024):
Yeah, but it would be good for the long-run: some of the parameters and their default settings that Ollama is using are very out of date compared to llama.cpp's server now and I can only see things getting worse and worse if nothing is done about it.
@sammcj commented on GitHub (May 4, 2024):
Anyway, https://github.com/ollama/ollama/pull/4120 provides the functionality for now, just waiting on someone to approve it...
@sammcj commented on GitHub (May 11, 2024):
#4120 is still sitting waiting for approval to be merged, I've been trying to keep it up and fix conflicts etc as other PRs are merged in.
@enzomich commented on GitHub (Jul 18, 2024):
FA is also required for another important feature already present in Llama.cpp and hopefully coming to Ollama: KV cache quantization, with the two options -ctk and -ctv . In particular, it's required for V:
llama_new_context_with_model: V cache quantization requires flash_attn