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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright Contributors to the Kokkos project
#include <filesystem>
#include <fstream>
#include <regex>
#include <TestCuda_Category.hpp>
#include <Kokkos_Macros.hpp>
#ifdef KOKKOS_ENABLE_EXPERIMENTAL_CXX20_MODULES
import kokkos.core;
#else
#include <Kokkos_Core.hpp>
#endif
#include <Kokkos_Graph.hpp>
#include <gtest/gtest.h>
namespace {
template <typename ViewType>
struct Increment {
ViewType data;
KOKKOS_FUNCTION
void operator()(const int) const { ++data(); }
};
// FIXME_GRAPH
// NOLINTBEGIN(bugprone-unchecked-optional-access)
class TEST_CATEGORY_FIXTURE(GraphInterOp) : public ::testing::Test {
public:
using execution_space = Kokkos::Cuda;
using view_t = Kokkos::View<int, Kokkos::CudaUVMSpace,
Kokkos::MemoryTraits<Kokkos::Atomic>>;
using graph_t = Kokkos::Experimental::Graph<execution_space>;
void SetUp() override {
data = view_t(Kokkos::view_alloc(exec, "witness"));
graph = Kokkos::Experimental::create_graph(exec, [&](const auto& root) {
root.then_parallel_for(1, Increment<view_t>{data});
});
}
protected:
execution_space exec{};
view_t data;
std::optional<graph_t> graph;
};
// This test checks the promises of Kokkos::Graph against its
// underlying Cuda native objects.
TEST_F(TEST_CATEGORY_FIXTURE(GraphInterOp), promises_on_native_objects) {
// Before instantiation, the Cuda graph is valid, but the Cuda executable
// graph is still null.
cudaGraph_t cuda_graph = graph->native_graph();
ASSERT_NE(cuda_graph, nullptr);
ASSERT_EQ(graph->native_graph_exec(), nullptr);
// After instantiation, both native objects are valid.
graph->instantiate();
cudaGraphExec_t cuda_graph_exec = graph->native_graph_exec();
ASSERT_EQ(graph->native_graph(), cuda_graph);
ASSERT_NE(cuda_graph_exec, nullptr);
// Submission should not affect the underlying objects.
graph->submit();
ASSERT_EQ(graph->native_graph(), cuda_graph);
ASSERT_EQ(graph->native_graph_exec(), cuda_graph_exec);
}
// Count the number of nodes. This is useful to ensure no spurious
// (possibly empty) node is added.
TEST_F(TEST_CATEGORY_FIXTURE(GraphInterOp), count_nodes) {
graph->instantiate();
size_t num_nodes;
KOKKOS_IMPL_CUDA_SAFE_CALL(
cudaGraphGetNodes(graph->native_graph(), nullptr, &num_nodes));
ASSERT_EQ(num_nodes, 2u);
}
// Use native Cuda graph to generate a DOT representation.
TEST_F(TEST_CATEGORY_FIXTURE(GraphInterOp), debug_dot_print) {
graph->instantiate();
const auto dot = std::filesystem::temp_directory_path() / "cuda_graph.dot";
// Convert path to string then to const char * to make it work on Windows.
KOKKOS_IMPL_CUDA_SAFE_CALL(
cudaGraphDebugDotPrint(graph->native_graph(), dot.string().c_str(),
cudaGraphDebugDotFlagsVerbose));
ASSERT_TRUE(std::filesystem::exists(dot));
ASSERT_GT(std::filesystem::file_size(dot), 0u);
// We could write a check against the full kernel's function signature, but
// it would make the test rely too much on internal implementation details.
// Therefore, we just look for the functor and policy. Note that the
// signature is mangled in the 'dot' output.
const std::string expected("[A-Za-z0-9_]+Increment[A-Za-z0-9_]+RangePolicy");
std::stringstream buffer;
buffer << std::ifstream(dot).rdbuf();
ASSERT_TRUE(std::regex_search(buffer.str(), std::regex(expected)))
<< "Could not find expected signature regex " << std::quoted(expected)
<< " in " << dot;
}
// Ensure that the graph has been instantiated with the default flag.
TEST_F(TEST_CATEGORY_FIXTURE(GraphInterOp), instantiation_flags) {
#if CUDA_VERSION < 12000
GTEST_SKIP() << "Graph instantiation flag inspection requires Cuda 12.";
#else
graph->instantiate();
unsigned long long flags =
Kokkos::Experimental::finite_max_v<unsigned long long>;
KOKKOS_IMPL_CUDA_SAFE_CALL(
cudaGraphExecGetFlags(graph->native_graph_exec(), &flags));
ASSERT_EQ(flags, 0u);
#endif
}
// Build a Kokkos::Graph from an existing cudaGraph_t.
TEST_F(TEST_CATEGORY_FIXTURE(GraphInterOp), construct_from_native) {
cudaGraph_t native_graph = nullptr;
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaGraphCreate(&native_graph, 0));
Kokkos::Experimental::Graph graph_from_native(this->exec, native_graph);
ASSERT_EQ(native_graph, graph_from_native.native_graph());
graph_from_native.root_node().then_parallel_for(1, Increment<view_t>{data});
graph_from_native.submit(this->exec);
this->exec.fence();
ASSERT_EQ(data(), 1);
}
// NOLINTEND(bugprone-unchecked-optional-access)
} // namespace
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