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Use one cusparse handle per thread to avoid race condition on cuspars… #544

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Merged
rapids-bot merged 2 commits into from
Oct 29, 2025
Merged

Use one cusparse handle per thread to avoid race condition on cuspars… #544

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ef84855
Use one cusparse handle per thread to avoid race condition on cuspars…
hlinsen Oct 27, 2025
030cb94
Merge branch 'main' into cusparse-handles
rgsl888prabhu Oct 29, 2025
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4 changes: 4 additions & 0 deletions cpp/src/dual_simplex/cusparse_view.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,10 @@ cusparse_view_t<i_t, f_t>::cusparse_view_t(raft::handle_t const* handle_ptr,
d_minus_one_(f_t(-1), handle_ptr->get_stream()),
d_zero_(f_t(0), handle_ptr->get_stream())
{
RAFT_CUBLAS_TRY(raft::linalg::detail::cublassetpointermode(
handle_ptr->get_cublas_handle(), CUBLAS_POINTER_MODE_DEVICE, handle_ptr->get_stream()));
RAFT_CUSPARSE_TRY(raft::sparse::detail::cusparsesetpointermode(
handle_ptr->get_cusparse_handle(), CUSPARSE_POINTER_MODE_DEVICE, handle_ptr->get_stream()));
// TMP matrix data should already be on the GPU
constexpr bool debug = false;
if (debug) { printf("A hash: %zu\n", A.hash()); }
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3 changes: 1 addition & 2 deletions cpp/src/linear_programming/solve.cu
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Expand Up @@ -672,9 +672,8 @@ optimization_problem_solution_t<i_t, f_t> run_concurrent(
// Initialize the dual simplex structures before we run PDLP.
// Otherwise, CUDA API calls to the problem stream may occur in both threads and throw graph
// capture off
auto barrier_handle = raft::handle_t(*op_problem.get_handle_ptr());
rmm::cuda_stream_view barrier_stream = rmm::cuda_stream_per_thread;
raft::resource::set_cuda_stream(barrier_handle, barrier_stream);
auto barrier_handle = raft::handle_t(barrier_stream);
// Make sure allocations are done on the original stream
problem.handle_ptr->sync_stream();

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