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[BUG] Fix a hang issue in MG triangle counts (when invoked with a small number of vertices to update triangle counts) #4517

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merged 1 commit into from
Jul 3, 2024
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[BUG] Fix a hang issue in MG triangle counts (when invoked with a small number of vertices to update triangle counts) #4517

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9 changes: 8 additions & 1 deletion cpp/src/community/triangle_count_impl.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,14 @@ void triangle_count(raft::handle_t const& handle,
}
}

if (vertices.has_value() && ((*vertices).size() == 0)) { return; }
if (vertices.has_value()) {
auto aggregate_vertex_count =
multi_gpu
? host_scalar_allreduce(
handle.get_comms(), (*vertices).size(), raft::comms::op_t::SUM, handle.get_stream())
: (*vertices).size();
if (aggregate_vertex_count == 0) { return; }
}

auto cur_graph_view = graph_view;

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