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CUDA: fix insufficient buffer clearing for MMQ #10032

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Oct 24, 2024
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CUDA: fix insufficient buffer clearing for MMQ #10032

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5 changes: 3 additions & 2 deletions ggml/src/ggml-cuda.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -1479,11 +1479,12 @@ static void ggml_cuda_op_mul_mat(
if (src0_is_contiguous) {
dev[id].src0_dd = split ? (char *) src0_extra->data_device[id] : (char *) src0->data;
} else {
// If src0 is not contiguous it will be copied to a temporary buffer, it may then be necessary to clear padding.
// If src0 is not contiguous it will be copied to a temporary buffer.
// This buffer needs to be cleared entirely because multiple regions will function as padding.
const size_t nbytes_data = ggml_nbytes(src0);
const size_t nbytes_padding = ggml_row_size(src0->type, MATRIX_ROW_PADDING - ne00 % MATRIX_ROW_PADDING);
dev[id].src0_dd = dev[id].src0_dd_alloc.alloc(ctx.pool(id), nbytes_data + nbytes_padding);
CUDA_CHECK(cudaMemsetAsync(dev[id].src0_dd + nbytes_data , 0, nbytes_padding, stream));
CUDA_CHECK(cudaMemsetAsync(dev[id].src0_dd, 0, nbytes_data + nbytes_padding, stream));
}

// If src0 is on a temporary compute buffer (partial offloading) there may be some padding that needs to be cleared:
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