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Add synchronization to coo_to_csr #5640

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Merged
rapids-bot merged 1 commit into from
Aug 31, 2026
Merged

Add synchronization to coo_to_csr #5640

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5 changes: 4 additions & 1 deletion cpp/include/cugraph/legacy/functions.hpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2020-2026, NVIDIA CORPORATION.
* SPDX-FileCopyrightText: Copyright (c) 2020-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
Expand Down Expand Up @@ -35,6 +35,9 @@ namespace CUGRAPH_EXPORT cugraph {
* @param[in] graph cuGraph graph in coordinate format
* @param[in] mr Memory resource used to allocate the returned graph
*
* @note Synchronizes the internal CUDA stream before returning so callers may use the
* returned CSR on a different stream without additional ordering.
*
* @return Unique pointer to generate Compressed Sparse Row graph
*
*/
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7 changes: 6 additions & 1 deletion cpp/src/converters/legacy/COOtoCSR.cuh
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION.
* SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/
/*
Expand Down Expand Up @@ -154,6 +154,11 @@ std::unique_ptr<legacy::GraphCSR<VT, ET, WT>> coo_to_csr(
std::move(coo_contents.dst_indices),
std::move(coo_contents.edge_data)};

// All conversion work runs on stream_view, which callers do not share (for example
// raft::handle_t defaults to cudaStreamPerThread). Synchronize before returning so
// downstream algorithms can safely consume the CSR buffers on any stream.
stream_view.synchronize();

return std::make_unique<legacy::GraphCSR<VT, ET, WT>>(std::move(csr_contents));
}

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