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Fix CUDA async stream. #8380

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Oct 22, 2022
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Fix CUDA async stream. #8380

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4 changes: 4 additions & 0 deletions src/objective/adaptive.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,10 @@ void EncodeTreeLeafDevice(Context const* ctx, common::Span<bst_node_t const> pos
auto pinned = pinned_pool.GetSpan<char>(sizeof(size_t) + sizeof(bst_node_t));
dh::CUDAStream copy_stream;
size_t* h_num_runs = reinterpret_cast<size_t*>(pinned.subspan(0, sizeof(size_t)).data());

dh::CUDAEvent e;
e.Record(dh::DefaultStream());
copy_stream.View().Wait(e);
// flag for whether there's ignored position
bst_node_t* h_first_unique =
reinterpret_cast<bst_node_t*>(pinned.subspan(sizeof(size_t), sizeof(bst_node_t)).data());
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