CUDA: fix crash on large batch size for quant. MoE #13537
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| @@ -56,13 +56,13 @@ static __global__ void quantize_mmq_q8_1( | |||
| constexpr int vals_per_scale = ds_layout == MMQ_Q8_1_DS_LAYOUT_D2S6 ? 64 : 32; | |||
| constexpr int vals_per_sum = ds_layout == MMQ_Q8_1_DS_LAYOUT_D2S6 ? 16 : 32; | |||
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| const int64_t i0 = ((int64_t)blockDim.x*blockIdx.x + threadIdx.x)*4; | |||
| const int64_t i0 = ((int64_t)blockDim.x*blockIdx.y + threadIdx.x)*4; | |||
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blockDim refers to the maximum extents of threadIdx. The configuration of threads was not changed, therefore blockDim.x is still correct.
slaren
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May 14, 2025
Yeah, this fixed it for me - thanks! |
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Should fix issue described in #13435 (comment) .
This PR swaps the x and y dimensions of the CUDA grid for quantizing the activations since the x dimension has a higher maximum size.