HIP: fixing SSM_SCAN backend testcase error by jiachengjason · Pull Request #23983 · ggml-org/llama.cpp

jiachengjason · 2026-06-01T16:50:21Z

Overview

ctest test-backend-ops fails because SSM_SCAN on ROCm disagrees with the reference beyond the test’s maximum allowed error on Strix Point (AMD Radeon(TM) 890M Graphics, gfx1150)

The Mamba-1 HIP/CUDA SSM_SCAN path has compile-time specializations for n_tok=1..8 and for n_tok=32 previously fell through to the generic runtime-length kernel (ssm_scan_f32<threads, 16, 0>)

Add a case 32 specialization (ssm_scan_f32<threads, 16, 32>), this routes the failing Mamba-1 shape away from the general runtime-length kernel. The actual SSM recurrence math is unchanged.

Validation

Full backend op suite passed:

ctest -R test-backend-ops --verbose
12383/12383 tests passed

No regression on various models.

Full Performance result for llama-bench across various quantization

GPU	Model	Microbatch size	Test	t/s master	t/s fix/jiachengjason/ssm_scan_error	Speedup
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	1	pp2048	36.57	36.57	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	1	tg128	31.86	31.76	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	2	pp2048	61.27	61.29	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	2	tg128	31.81	31.81	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	4	pp2048	85.41	85.62	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	4	tg128	31.81	31.90	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	8	pp2048	102.14	102.39	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	8	tg128	31.83	31.82	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	16	pp2048	238.49	238.71	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	16	tg128	31.91	31.91	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	32	pp2048	299.34	299.41	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	32	tg128	31.91	31.91	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	64	pp2048	377.82	378.10	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	64	tg128	31.90	31.82	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	128	pp2048	422.25	426.81	1.01
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	128	tg128	31.81	31.91	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	256	pp2048	431.24	432.57	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	256	tg128	31.82	31.90	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	512	pp2048	437.93	437.07	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	512	tg128	31.79	31.84	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	1024	pp2048	441.16	441.53	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	1024	tg128	31.82	31.91	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	2048	pp2048	437.11	437.67	1.00
890M Graphics	llama 8B IQ1_S - 1.5625 bpw	2048	tg128	31.88	31.81	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	1	pp2048	20.21	20.20	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	1	tg128	18.41	18.39	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	2	pp2048	35.94	35.76	0.99
890M Graphics	llama 8B IQ2_S - 2.5 bpw	2	tg128	18.44	18.43	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	4	pp2048	57.39	57.16	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	4	tg128	18.43	18.41	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	8	pp2048	79.16	78.86	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	8	tg128	18.46	18.44	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	16	pp2048	133.13	133.26	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	16	tg128	18.45	18.44	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	32	pp2048	226.37	226.67	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	32	tg128	18.46	18.44	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	64	pp2048	305.04	305.83	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	64	tg128	18.47	18.45	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	128	pp2048	376.43	380.55	1.01
890M Graphics	llama 8B IQ2_S - 2.5 bpw	128	tg128	18.44	18.42	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	256	pp2048	386.74	385.20	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	256	tg128	18.44	18.41	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	512	pp2048	384.26	383.30	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	512	tg128	18.45	18.41	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	1024	pp2048	384.29	384.02	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	1024	tg128	18.48	18.41	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	2048	pp2048	381.21	380.63	1.00
890M Graphics	llama 8B IQ2_S - 2.5 bpw	2048	tg128	18.45	18.41	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	1	pp2048	20.56	20.49	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	1	tg128	18.68	18.66	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	2	pp2048	36.52	36.44	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	2	tg128	18.72	18.71	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	4	pp2048	56.93	56.88	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	4	tg128	18.69	18.70	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	8	pp2048	77.35	77.30	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	8	tg128	18.82	18.82	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	16	pp2048	130.97	131.18	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	16	tg128	18.72	18.81	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	32	pp2048	226.36	226.31	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	32	tg128	18.82	18.73	0.99
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	64	pp2048	299.03	300.98	1.01
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	64	tg128	18.73	18.81	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	128	pp2048	362.84	367.00	1.01
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	128	tg128	18.71	18.72	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	256	pp2048	377.14	376.25	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	256	tg128	18.80	18.82	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	512	pp2048	377.74	378.36	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	512	tg128	18.71	18.71	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	1024	pp2048	381.70	381.27	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	1024	tg128	18.81	18.71	0.99
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	2048	pp2048	379.66	378.78	1.00
890M Graphics	llama 8B IQ2_XS - 2.3125 bpw	2048	tg128	18.71	18.72	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	1	pp2048	21.23	21.22	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	1	tg128	19.25	19.25	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	2	pp2048	37.90	37.98	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	2	tg128	19.28	19.32	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	4	pp2048	59.61	59.78	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	4	tg128	19.37	19.38	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	8	pp2048	83.44	83.66	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	8	tg128	19.39	19.30	0.99
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	16	pp2048	170.06	169.89	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	16	tg128	19.32	19.30	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	32	pp2048	230.48	230.22	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	32	tg128	19.36	19.31	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	64	pp2048	346.52	346.67	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	64	tg128	19.30	19.30	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	128	pp2048	406.85	405.05	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	128	tg128	19.26	19.28	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	256	pp2048	410.89	409.64	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	256	tg128	19.36	19.38	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	512	pp2048	414.14	414.00	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	512	tg128	19.41	19.27	0.99
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	1024	pp2048	417.32	416.88	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	1024	tg128	19.27	19.27	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	2048	pp2048	414.62	414.79	1.00
890M Graphics	llama 8B IQ2_XXS - 2.0625 bpw	2048	tg128	19.39	19.27	0.99
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	1	pp2048	18.09	18.09	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	1	tg128	16.34	16.35	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	2	pp2048	32.50	32.62	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	2	tg128	16.36	16.38	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	4	pp2048	54.41	54.46	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	4	tg128	16.35	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	8	pp2048	81.95	82.03	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	8	tg128	16.36	16.38	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	16	pp2048	156.97	156.99	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	16	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	32	pp2048	204.42	205.03	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	32	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	64	pp2048	321.51	323.04	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	64	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	128	pp2048	402.74	402.92	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	128	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	256	pp2048	411.55	409.47	0.99
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	256	tg128	16.38	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	512	pp2048	410.19	409.15	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	512	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	1024	pp2048	410.15	410.97	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	1024	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	2048	pp2048	405.98	406.25	1.00
890M Graphics	llama 8B IQ3_S - 3.4375 bpw	2048	tg128	16.37	16.37	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	1	pp2048	17.91	17.85	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	1	tg128	16.19	16.15	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	2	pp2048	32.35	31.62	0.98
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	2	tg128	16.22	16.20	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	4	pp2048	52.64	51.62	0.98
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	4	tg128	16.21	16.18	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	8	pp2048	74.86	73.89	0.99
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	8	tg128	16.21	16.20	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	16	pp2048	158.42	158.48	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	16	tg128	16.21	16.19	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	32	pp2048	209.39	210.10	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	32	tg128	16.21	16.20	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	64	pp2048	325.22	325.74	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	64	tg128	16.22	16.20	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	128	pp2048	402.52	403.57	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	128	tg128	16.22	16.19	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	256	pp2048	409.95	410.68	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	256	tg128	16.22	16.19	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	512	pp2048	409.22	409.52	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	512	tg128	16.22	16.18	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	1024	pp2048	409.30	411.77	1.01
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	1024	tg128	16.22	16.19	1.00
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	2048	pp2048	405.64	402.82	0.99
890M Graphics	llama 8B IQ3_S mix - 3.66 bpw	2048	tg128	16.21	16.20	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	1	pp2048	18.30	18.25	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	1	tg128	16.49	16.45	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	2	pp2048	34.12	33.76	0.99
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	2	tg128	16.53	16.50	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	4	pp2048	54.76	54.26	0.99
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	4	tg128	16.52	16.50	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	8	pp2048	81.56	80.92	0.99
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	8	tg128	16.53	16.48	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	16	pp2048	161.65	161.32	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	16	tg128	16.53	16.50	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	32	pp2048	206.30	204.35	0.99
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	32	tg128	16.52	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	64	pp2048	321.84	322.08	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	64	tg128	16.52	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	128	pp2048	408.54	408.46	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	128	tg128	16.52	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	256	pp2048	415.98	416.64	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	256	tg128	16.53	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	512	pp2048	414.60	414.25	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	512	tg128	16.53	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	1024	pp2048	416.63	415.71	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	1024	tg128	16.53	16.49	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	2048	pp2048	410.27	411.02	1.00
890M Graphics	llama 8B IQ3_XS - 3.3 bpw	2048	tg128	16.52	16.49	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	1	pp2048	18.81	18.71	0.99
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	1	tg128	17.20	17.12	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	2	pp2048	35.25	34.75	0.99
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	2	tg128	17.25	17.19	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	4	pp2048	55.05	54.20	0.98
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	4	tg128	17.24	17.16	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	8	pp2048	80.86	79.93	0.99
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	8	tg128	17.24	17.16	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	16	pp2048	158.49	158.32	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	16	tg128	17.25	17.17	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	32	pp2048	210.59	210.42	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	32	tg128	17.24	17.16	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	64	pp2048	322.14	323.35	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	64	tg128	17.24	17.16	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	128	pp2048	406.27	401.38	0.99
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	128	tg128	17.25	17.16	0.99
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	256	pp2048	415.45	415.68	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	256	tg128	17.25	17.19	1.00
890M Graphics	llama 8B IQ3_XXS - 3.0625 bpw	512	pp2048	411.55	414.68	1.01
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	2	pp2048	33.89	33.66	0.99
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	2	tg128	15.89	15.77	0.99
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	32	tg128	15.83	15.71	0.99
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	64	pp2048	406.78	405.96	1.00
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	64	tg128	15.90	15.76	0.99
890M Graphics	llama 8B IQ4_NL - 4.5 bpw	1024	tg128	15.83	15.70	0.99
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	1	pp2048	18.61	18.56	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	2	tg128	16.87	16.81	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	4	pp2048	66.56	66.24	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	4	tg128	16.84	16.79	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	32	pp2048	206.51	205.64	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	32	tg128	16.85	16.80	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	64	pp2048	395.79	395.91	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	64	tg128	16.87	16.81	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	128	pp2048	445.24	442.70	0.99
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	128	tg128	16.83	16.79	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	512	pp2048	457.69	457.57	1.00
890M Graphics	llama 8B IQ4_XS - 4.25 bpw	2048	tg128	16.84	16.74	0.99
890M Graphics	llama 8B Q2_K_S	2	pp2048	42.05	42.28	1.01
890M Graphics	llama 8B Q2_K_S	4	tg128	23.29	23.35	1.00
890M Graphics	llama 8B Q2_K_S	8	pp2048	50.49	50.66	1.00
890M Graphics	llama 8B Q2_K_S	8	tg128	23.30	23.38	1.00
890M Graphics	llama 8B Q2_K_S	16	pp2048	132.95	132.89	1.00
890M Graphics	llama 8B Q2_K_S	16	tg128	23.31	23.38	1.00
890M Graphics	llama 8B Q2_K_S	32	pp2048	175.47	175.73	1.00
890M Graphics	llama 8B Q2_K_S	32	tg128	23.30	23.36	1.00
890M Graphics	llama 8B Q2_K_S	64	pp2048	229.07	229.34	1.00
890M Graphics	llama 8B Q2_K_S	64	tg128	23.31	23.38	1.00
890M Graphics	llama 8B Q2_K_S	128	pp2048	232.60	232.67	1.00
890M Graphics	llama 8B Q2_K_S	128	tg128	23.31	23.35	1.00
890M Graphics	llama 8B Q2_K_S	256	pp2048	252.69	252.08	1.00
890M Graphics	llama 8B Q2_K_S	256	tg128	23.22	23.35	1.01
890M Graphics	llama 8B Q2_K_S	512	pp2048	318.47	317.78	1.00
890M Graphics	llama 8B Q2_K_S	512	tg128	23.22	23.33	1.00
890M Graphics	llama 8B Q2_K_S	1024	pp2048	355.28	355.33	1.00
890M Graphics	llama 8B Q2_K_S	1024	tg128	23.22	23.31	1.00
890M Graphics	llama 8B Q2_K_S	2048	pp2048	367.43	365.72	1.00
890M Graphics	llama 8B Q2_K_S	2048	tg128	23.21	23.32	1.00
890M Graphics	llama 8B Q3_K_S	1	pp2048	21.40	21.23	0.99
890M Graphics	llama 8B Q3_K_S	1	tg128	19.12	18.98	0.99
890M Graphics	llama 8B Q3_K_S	2	pp2048	37.34	37.30	1.00
890M Graphics	llama 8B Q3_K_S	2	tg128	19.15	19.01	0.99
890M Graphics	llama 8B Q3_K_S	4	pp2048	51.56	51.27	0.99
890M Graphics	llama 8B Q3_K_S	4	tg128	19.14	19.01	0.99
890M Graphics	llama 8B Q3_K_S	8	pp2048	55.21	55.31	1.00
890M Graphics	llama 8B Q3_K_S	8	tg128	19.14	19.03	0.99
890M Graphics	llama 8B Q3_K_S	16	pp2048	178.75	178.89	1.00
890M Graphics	llama 8B Q3_K_S	16	tg128	19.15	19.01	0.99
890M Graphics	llama 8B Q3_K_S	32	pp2048	270.86	270.58	1.00
890M Graphics	llama 8B Q3_K_S	32	tg128	19.14	19.06	1.00
890M Graphics	llama 8B Q3_K_S	64	pp2048	347.10	347.42	1.00
890M Graphics	llama 8B Q3_K_S	64	tg128	19.15	19.04	0.99
890M Graphics	llama 8B Q3_K_S	128	pp2048	390.06	392.93	1.01
890M Graphics	llama 8B Q3_K_S	128	tg128	19.15	19.06	1.00
890M Graphics	llama 8B Q3_K_S	256	pp2048	400.68	399.53	1.00
890M Graphics	llama 8B Q3_K_S	256	tg128	19.16	19.05	0.99
890M Graphics	llama 8B Q3_K_S	512	pp2048	403.20	403.94	1.00
890M Graphics	llama 8B Q3_K_S	512	tg128	19.15	19.03	0.99
890M Graphics	llama 8B Q3_K_S	1024	pp2048	405.46	406.36	1.00
890M Graphics	llama 8B Q3_K_S	1024	tg128	19.14	19.02	0.99
890M Graphics	llama 8B Q3_K_S	2048	pp2048	401.53	402.33	1.00
890M Graphics	llama 8B Q3_K_S	2048	tg128	19.16	19.03	0.99
890M Graphics	llama 8B Q4_0	1	pp2048	17.26	17.24	1.00
890M Graphics	llama 8B Q4_0	1	tg128	15.69	15.68	1.00
890M Graphics	llama 8B Q4_0	2	pp2048	33.75	33.70	1.00
890M Graphics	llama 8B Q4_0	2	tg128	15.74	15.72	1.00
890M Graphics	llama 8B Q4_0	4	pp2048	64.12	64.14	1.00
890M Graphics	llama 8B Q4_0	4	tg128	15.68	15.68	1.00
890M Graphics	llama 8B Q4_0	8	pp2048	107.03	107.45	1.00
890M Graphics	llama 8B Q4_0	8	tg128	15.70	15.67	1.00
890M Graphics	llama 8B Q4_0	16	pp2048	204.84	204.94	1.00
890M Graphics	llama 8B Q4_0	16	tg128	15.68	15.69	1.00
890M Graphics	llama 8B Q4_0	32	pp2048	211.92	211.25	1.00
890M Graphics	llama 8B Q4_0	32	tg128	15.69	15.68	1.00
890M Graphics	llama 8B Q4_0	64	pp2048	391.87	392.26	1.00
890M Graphics	llama 8B Q4_0	64	tg128	15.74	15.74	1.00
890M Graphics	llama 8B Q4_0	128	pp2048	435.83	434.69	1.00
890M Graphics	llama 8B Q4_0	128	tg128	15.68	15.68	1.00
890M Graphics	llama 8B Q4_0	256	pp2048	444.76	444.46	1.00
890M Graphics	llama 8B Q4_0	256	tg128	15.68	15.68	1.00
890M Graphics	llama 8B Q4_0	512	pp2048	443.89	442.61	1.00
890M Graphics	llama 8B Q4_0	512	tg128	15.69	15.68	1.00
890M Graphics	llama 8B Q4_0	1024	pp2048	446.93	443.11	0.99
890M Graphics	llama 8B Q4_0	1024	tg128	15.68	15.68	1.00
890M Graphics	llama 8B Q4_0	2048	pp2048	443.72	441.71	1.00
890M Graphics	llama 8B Q4_0	2048	tg128	15.68	15.68	1.00
890M Graphics	llama 8B Q4_1	1	pp2048	15.82	15.83	1.00
890M Graphics	llama 8B Q4_1	1	tg128	14.49	14.51	1.00
890M Graphics	llama 8B Q4_1	2	pp2048	31.11	31.14	1.00
890M Graphics	llama 8B Q4_1	2	tg128	14.54	14.54	1.00
890M Graphics	llama 8B Q4_1	4	pp2048	58.77	58.72	1.00
890M Graphics	llama 8B Q4_1	4	tg128	14.47	14.47	1.00
890M Graphics	llama 8B Q4_1	8	pp2048	98.59	98.83	1.00
890M Graphics	llama 8B Q4_1	8	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_1	16	pp2048	172.82	173.29	1.00
890M Graphics	llama 8B Q4_1	16	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_1	32	pp2048	270.18	271.56	1.01
890M Graphics	llama 8B Q4_1	32	tg128	14.48	14.49	1.00
890M Graphics	llama 8B Q4_1	64	pp2048	372.27	372.04	1.00
890M Graphics	llama 8B Q4_1	64	tg128	14.53	14.54	1.00
890M Graphics	llama 8B Q4_1	128	pp2048	391.85	397.34	1.01
890M Graphics	llama 8B Q4_1	128	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_1	256	pp2048	404.48	401.70	0.99
890M Graphics	llama 8B Q4_1	256	tg128	14.47	14.48	1.00
890M Graphics	llama 8B Q4_1	512	pp2048	405.96	403.57	0.99
890M Graphics	llama 8B Q4_1	512	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_1	1024	pp2048	406.38	401.09	0.99
890M Graphics	llama 8B Q4_1	1024	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_1	2048	pp2048	402.98	400.61	0.99
890M Graphics	llama 8B Q4_1	2048	tg128	14.48	14.48	1.00
890M Graphics	llama 8B Q4_K_S	1	pp2048	16.87	16.82	1.00
890M Graphics	llama 8B Q4_K_S	1	tg128	15.39	15.31	0.99
890M Graphics	llama 8B Q4_K_S	2	pp2048	29.53	28.68	0.97
890M Graphics	llama 8B Q4_K_S	2	tg128	15.41	15.34	1.00
890M Graphics	llama 8B Q4_K_S	4	pp2048	40.56	39.12	0.96
890M Graphics	llama 8B Q4_K_S	4	tg128	15.35	15.32	1.00
890M Graphics	llama 8B Q4_K_S	8	pp2048	43.67	42.78	0.98
890M Graphics	llama 8B Q4_K_S	8	tg128	15.36	15.33	1.00
890M Graphics	llama 8B Q4_K_S	16	pp2048	178.48	177.34	0.99
890M Graphics	llama 8B Q4_K_S	16	tg128	15.35	15.31	1.00
890M Graphics	llama 8B Q4_K_S	32	pp2048	258.60	257.78	1.00
890M Graphics	llama 8B Q4_K_S	32	tg128	15.38	15.33	1.00
890M Graphics	llama 8B Q4_K_S	64	pp2048	341.78	340.61	1.00
890M Graphics	llama 8B Q4_K_S	64	tg128	15.40	15.36	1.00
890M Graphics	llama 8B Q4_K_S	128	pp2048	397.15	394.15	0.99
890M Graphics	llama 8B Q4_K_S	128	tg128	15.35	15.32	1.00
890M Graphics	llama 8B Q4_K_S	256	pp2048	405.46	401.91	0.99
890M Graphics	llama 8B Q4_K_S	256	tg128	15.35	15.30	1.00
890M Graphics	llama 8B Q4_K_S	512	pp2048	403.01	399.07	0.99
890M Graphics	llama 8B Q4_K_S	512	tg128	15.35	15.30	1.00
890M Graphics	llama 8B Q4_K_S	1024	pp2048	405.75	401.45	0.99
890M Graphics	llama 8B Q4_K_S	1024	tg128	15.36	15.31	1.00
890M Graphics	llama 8B Q4_K_S	2048	pp2048	402.21	395.92	0.98
890M Graphics	llama 8B Q4_K_S	2048	tg128	15.34	15.31	1.00
890M Graphics	llama 8B Q5_1	1	pp2048	13.38	13.25	0.99
890M Graphics	llama 8B Q5_1	1	tg128	12.35	12.23	0.99
890M Graphics	llama 8B Q5_1	2	pp2048	26.21	25.91	0.99
890M Graphics	llama 8B Q5_1	2	tg128	12.36	12.24	0.99
890M Graphics	llama 8B Q5_1	4	pp2048	50.15	49.61	0.99
890M Graphics	llama 8B Q5_1	4	tg128	12.35	12.23	0.99
890M Graphics	llama 8B Q5_1	8	pp2048	87.26	85.48	0.98
890M Graphics	llama 8B Q5_1	8	tg128	12.35	12.24	0.99
890M Graphics	llama 8B Q5_1	16	pp2048	113.00	109.96	0.97
890M Graphics	llama 8B Q5_1	16	tg128	12.35	12.24	0.99
890M Graphics	llama 8B Q5_1	32	pp2048	178.24	178.22	1.00
890M Graphics	llama 8B Q5_1	32	tg128	12.36	12.23	0.99
890M Graphics	llama 8B Q5_1	64	pp2048	281.86	282.92	1.00
890M Graphics	llama 8B Q5_1	64	tg128	12.36	12.25	0.99
890M Graphics	llama 8B Q5_1	128	pp2048	347.40	349.11	1.00
890M Graphics	llama 8B Q5_1	128	tg128	12.34	12.23	0.99
890M Graphics	llama 8B Q5_1	256	pp2048	363.46	361.36	0.99
890M Graphics	llama 8B Q5_1	256	tg128	12.34	12.23	0.99
890M Graphics	llama 8B Q5_1	512	pp2048	365.58	363.69	0.99
890M Graphics	llama 8B Q5_1	512	tg128	12.34	12.23	0.99
890M Graphics	llama 8B Q5_1	1024	pp2048	372.09	366.82	0.99
890M Graphics	llama 8B Q5_1	1024	tg128	12.34	12.23	0.99
890M Graphics	llama 8B Q5_1	2048	pp2048	368.54	361.10	0.98
890M Graphics	llama 8B Q5_1	2048	tg128	12.34	12.23	0.99
890M Graphics	llama 8B Q5_K_S	1	pp2048	13.91	13.83	0.99
890M Graphics	llama 8B Q5_K_S	1	tg128	12.86	12.79	0.99
890M Graphics	llama 8B Q5_K_S	2	pp2048	26.94	25.77	0.96
890M Graphics	llama 8B Q5_K_S	2	tg128	12.88	12.81	0.99
890M Graphics	llama 8B Q5_K_S	4	pp2048	38.46	36.07	0.94
890M Graphics	llama 8B Q5_K_S	4	tg128	12.81	12.73	0.99
890M Graphics	llama 8B Q5_K_S	8	pp2048	43.22	41.55	0.96
890M Graphics	llama 8B Q5_K_S	8	tg128	12.82	12.75	0.99
890M Graphics	llama 8B Q5_K_S	16	pp2048	183.03	175.33	0.96
890M Graphics	llama 8B Q5_K_S	16	tg128	12.82	12.76	1.00
890M Graphics	llama 8B Q5_K_S	32	pp2048	282.56	280.22	0.99
890M Graphics	llama 8B Q5_K_S	32	tg128	12.84	12.77	0.99
890M Graphics	llama 8B Q5_K_S	64	pp2048	375.84	376.11	1.00
890M Graphics	llama 8B Q5_K_S	64	tg128	12.88	12.80	0.99
890M Graphics	llama 8B Q5_K_S	128	pp2048	395.64	402.77	1.02
890M Graphics	llama 8B Q5_K_S	128	tg128	12.83	12.74	0.99
890M Graphics	llama 8B Q5_K_S	256	pp2048	408.23	406.87	1.00
890M Graphics	llama 8B Q5_K_S	256	tg128	12.82	12.74	0.99
890M Graphics	llama 8B Q5_K_S	512	pp2048	409.80	407.20	0.99
890M Graphics	llama 8B Q5_K_S	512	tg128	12.83	12.75	0.99
890M Graphics	llama 8B Q5_K_S	1024	pp2048	420.12	411.83	0.98
890M Graphics	llama 8B Q5_K_S	1024	tg128	12.83	12.75	0.99
890M Graphics	llama 8B Q5_K_S	2048	pp2048	414.25	410.02	0.99
890M Graphics	llama 8B Q5_K_S	2048	tg128	12.83	12.75	0.99
890M Graphics	llama 8B Q6_K	1	pp2048	12.01	12.06	1.00
890M Graphics	llama 8B Q6_K	1	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	2	pp2048	23.90	24.16	1.01
890M Graphics	llama 8B Q6_K	2	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	4	pp2048	43.31	44.67	1.03
890M Graphics	llama 8B Q6_K	4	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q6_K	8	pp2048	56.66	57.93	1.02
890M Graphics	llama 8B Q6_K	8	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	16	pp2048	141.53	145.66	1.03
890M Graphics	llama 8B Q6_K	16	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	32	pp2048	211.04	212.63	1.01
890M Graphics	llama 8B Q6_K	32	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	64	pp2048	272.83	273.45	1.00
890M Graphics	llama 8B Q6_K	64	tg128	11.15	11.19	1.00
890M Graphics	llama 8B Q6_K	128	pp2048	301.31	302.51	1.00
890M Graphics	llama 8B Q6_K	128	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q6_K	256	pp2048	306.52	307.73	1.00
890M Graphics	llama 8B Q6_K	256	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q6_K	512	pp2048	304.33	304.21	1.00
890M Graphics	llama 8B Q6_K	512	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q6_K	1024	pp2048	348.21	348.34	1.00
890M Graphics	llama 8B Q6_K	1024	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q6_K	2048	pp2048	360.58	359.34	1.00
890M Graphics	llama 8B Q6_K	2048	tg128	11.14	11.18	1.00
890M Graphics	llama 8B Q8_0	1	pp2048	9.12	9.10	1.00
890M Graphics	llama 8B Q8_0	1	tg128	8.44	7.95	0.94
890M Graphics	llama 8B Q8_0	2	pp2048	18.54	18.47	1.00
890M Graphics	llama 8B Q8_0	2	tg128	8.46	8.07	0.95
890M Graphics	llama 8B Q8_0	4	pp2048	36.40	36.30	1.00
890M Graphics	llama 8B Q8_0	4	tg128	8.44	8.11	0.96
890M Graphics	llama 8B Q8_0	8	pp2048	68.44	68.33	1.00
890M Graphics	llama 8B Q8_0	8	tg128	8.44	8.14	0.96
890M Graphics	llama 8B Q8_0	16	pp2048	126.05	125.69	1.00
890M Graphics	llama 8B Q8_0	16	tg128	8.44	8.21	0.97
890M Graphics	llama 8B Q8_0	32	pp2048	170.86	169.19	0.99
890M Graphics	llama 8B Q8_0	32	tg128	8.44	8.17	0.97
890M Graphics	llama 8B Q8_0	64	pp2048	322.36	322.29	1.00
890M Graphics	llama 8B Q8_0	64	tg128	8.46	8.25	0.98
890M Graphics	llama 8B Q8_0	128	pp2048	389.51	377.65	0.97
890M Graphics	llama 8B Q8_0	128	tg128	8.43	8.27	0.98
890M Graphics	llama 8B Q8_0	256	pp2048	399.14	379.74	0.95
890M Graphics	llama 8B Q8_0	256	tg128	8.43	8.27	0.98
890M Graphics	llama 8B Q8_0	512	pp2048	400.56	371.29	0.93
890M Graphics	llama 8B Q8_0	512	tg128	8.44	8.34	0.99
890M Graphics	llama 8B Q8_0	1024	pp2048	404.39	350.36	0.87
890M Graphics	llama 8B Q8_0	1024	tg128	8.43	8.32	0.99
890M Graphics	llama 8B Q8_0	2048	pp2048	402.18	303.54	0.75
890M Graphics	llama 8B Q8_0	2048	tg128	8.43	8.35	0.99

Requirements

I have read and agree with the contributing guidelines
AI usage disclosure: Yes I have used AI to help me with understanding the code and give me ideas of initial implementation.

JohannesGaessler

Sorry, I don't understand the goal of this PR. It sounds to me like there are issues with correctness but whether or not there is a template specialization for 32 should only affect performance.

jiachengjason · 2026-06-02T18:45:26Z

Sorry, I don't understand the goal of this PR. It sounds to me like there are issues with correctness but whether or not there is a template specialization for 32 should only affect performance.

The issue isn't that the specialization changes correctness directly. The problem is that the host can select mmq_x = 32, but there is no matching device implementation. This PR adds the missing specialization so the selected configuration is actually supported, fixing the correctness bug seen on Strix Point (gfx1150) specifically.

ORippler · 2026-06-09T10:12:33Z

@jiachengjason Is this potentially affecting the cuda backend as well? https://github.com/ggml-org/llama.cpp/actions/runs/27192383880/job/80275487186?pr=24331

I quickly verified it not to be a PDL issue on DGX Spark & efbacf8

while true; do GGML_CUDA_PDL=0 ./build/bin/test-backend-ops -o SSM_SCAN || break; done

ggml_backend_cuda_get_available_uma_memory: final available_memory_kb: 97246976
Backend 1/2: CUDA0
  Device description: NVIDIA GB10
  Device memory: 126758 MB (94967 MB free)

  SSM_SCAN(type=f32,d_state=16,head_dim=1,n_head=1024,n_group=1,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): OK
  SSM_SCAN(type=f32,d_state=128,head_dim=64,n_head=16,n_group=2,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): OK
  SSM_SCAN(type=f32,d_state=256,head_dim=64,n_head=8,n_group=2,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): OK
  SSM_SCAN(type=f32,d_state=128,head_dim=128,n_head=4,n_group=4,n_seq_tokens=16,n_seqs=2,xbc_overlap=1): OK
  4/4 tests passed
  Backend CUDA0: OK
Backend 2/2: CPU
  Skipping CPU backend
2/2 backends passed
OK
ggml_cuda_init: found 1 CUDA devices (Total VRAM: 126758 MiB):
  Device 0: NVIDIA GB10, compute capability 12.1, VMM: yes, VRAM: 126758 MiB
Testing 2 devices

ggml_backend_cuda_get_available_uma_memory: final available_memory_kb: 97161536
Backend 1/2: CUDA0
  Device description: NVIDIA GB10
  Device memory: 126758 MB (94884 MB free)

[SSM_SCAN] ERR = 0.000432363 > 0.000000100   SSM_SCAN(type=f32,d_state=16,head_dim=1,n_head=1024,n_group=1,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): FAIL
  SSM_SCAN(type=f32,d_state=128,head_dim=64,n_head=16,n_group=2,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): OK
  SSM_SCAN(type=f32,d_state=256,head_dim=64,n_head=8,n_group=2,n_seq_tokens=32,n_seqs=4,xbc_overlap=0): OK
  SSM_SCAN(type=f32,d_state=128,head_dim=128,n_head=4,n_group=4,n_seq_tokens=16,n_seqs=2,xbc_overlap=1): OK
  3/4 tests passed

Failing tests:
  SSM_SCAN(type=f32,d_state=16,head_dim=1,n_head=1024,n_group=1,n_seq_tokens=32,n_seqs=4,xbc_overlap=0)
  Backend CUDA0: FAIL
Backend 2/2: CPU
  Skipping CPU backend
1/2 backends passed
FAIL

Seems like we are likely missing a syncthreads somewhere, at least in the CUB path

ORippler · 2026-06-09T13:45:33Z

@jiachengjason please see if #24360 fixes the correctness-issues on your side as well.

jiachengjason · 2026-06-09T16:02:32Z

@jiachengjason please see if #24360 fixes the correctness-issues on your side as well.

Yes it does

jiachengjason · 2026-06-10T17:00:14Z

closing this pr as #24360 fixes this

fixing SSM_SCAN backend testcase error

4cd984b

jiachengjason changed the title ~~fixing SSM_SCAN backend testcase error~~ HIP: fixing SSM_SCAN backend testcase error Jun 1, 2026

jiachengjason marked this pull request as ready for review June 1, 2026 16:50

jiachengjason requested a review from a team as a code owner June 1, 2026 16:50

github-actions Bot added Nvidia GPU Issues specific to Nvidia GPUs ggml changes relating to the ggml tensor library for machine learning labels Jun 1, 2026

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JohannesGaessler reviewed Jun 2, 2026

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jiachengjason requested a review from JohannesGaessler June 8, 2026 20:49

ORippler mentioned this pull request Jun 9, 2026

CUDA: Fix ssm_scan_f32 data-races #24360

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HIP: fixing SSM_SCAN backend testcase error#23983

HIP: fixing SSM_SCAN backend testcase error#23983
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