Excessively slow prompt processing time with 70B partially offloaded in SYCL

[Jacoby1218]

prompt processing is extremely slow with a 70B partially offloaded.
llama-bench.exe -ngl 20 -m "D:\models\lzlv_70b_fp16_hf.Q4_K_M.gguf"
Using device 0 (Intel(R) Arc(TM) A770 Graphics) as main device

model	size	params	backend	ngl	test	t/s
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	SYCL	20	pp 512	2.14 ± 0.28
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	SYCL	20	tg 128	1.03 ± 0.01

build: a28c5ef (2045)

[airMeng]

hi @Jacoby1218 could you provide some reference data to show the magnitude of gaps? for example, performance on RTX-4070ti (16 GB), or entirely on iGPU/CPU?

[Jacoby1218]

I don't have any other GPU to test, but i can provide results from my CPU and other backends.

model	size	params	backend	threads	test	t/s
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	BLAS	6	pp 512	1.93 ± 0.06
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	BLAS	6	tg 128	0.81 ± 0.02

model	size	params	backend	ngl	test	t/s
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	Vulkan	20	pp 512	7.02 ± 0.25
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	Vulkan	20	tg 128	0.97 ± 0.04
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	OpenCL	20	pp 512	8.81 ± 1.10
llama 70B Q4_K - Medium	38.58 GiB	68.98 B	OpenCL	20	tg 128	0.82 ± 0.02

[airMeng]

I think this maybe due to lacking optimization on multi-batch, has been recordd in #5277, please stay tuned!

[github-actions]

This issue is stale because it has been open for 30 days with no activity.

[airMeng]

I think this has been improved with #6217, please give a try.

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.