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Fix lanczos launch grid #3109

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Merged
rapids-bot merged 2 commits into from
Aug 12, 2026
Merged

Fix lanczos launch grid #3109

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8ad66c7
Fix lancsoz launch grid
achirkin Aug 11, 2026
46b9252
cast k to int
achirkin Aug 11, 2026
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8 changes: 4 additions & 4 deletions cpp/include/raft/sparse/solver/detail/lanczos.cuh
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION.
* SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/

Expand Down Expand Up @@ -157,13 +157,13 @@ void lanczos_solve_ritz(
// alpha.data_handle(), triangular_matrix.data_handle(), ncv, ncv, stream);

int blockSize = 256;
int numBlocks = (ncv + blockSize - 1) / blockSize;
int numBlocks = raft::div_rounding_up_safe(ncv, blockSize);
kernel_triangular_populate<ValueTypeT>
<<<blockSize, numBlocks, 0, stream>>>(triangular_matrix.data_handle(), beta.data_handle(), ncv);
<<<numBlocks, blockSize, 0, stream>>>(triangular_matrix.data_handle(), beta.data_handle(), ncv);

if (beta_k) {
int threadsPerBlock = 256;
int blocksPerGrid = (k + threadsPerBlock - 1) / threadsPerBlock;
int blocksPerGrid = raft::div_rounding_up_safe<int>(k, threadsPerBlock);
kernel_triangular_beta_k<ValueTypeT><<<blocksPerGrid, threadsPerBlock, 0, stream>>>(
triangular_matrix.data_handle(), beta_k.value().data_handle(), (int)k, ncv);
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}
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