test_split.cpp

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#include "kokkos-execution/utils/ignore_warnings.hpp"
PRAGMA_DIAGNOSTIC_PUSH
KOKKOS_EXECUTION_STDEXEC_PRAGMA_DIAGNOSTIC_IGNORED
#include "exec/split.hpp"
#include "exec/static_thread_pool.hpp"
PRAGMA_DIAGNOSTIC_POP
 
#include "kokkos-execution/execution_space.hpp"
 
#include "kokkos-utils/callbacks/RecorderListener.hpp"
#include "kokkos-utils/tests/scoped/callbacks/Manager.hpp"
 
#include "tests/utils/callback_matchers.hpp"
#include "tests/utils/execution_space_context.hpp"
#include "tests/utils/functors/increment.hpp"

 
namespace Tests::ExecutionSpaceImpl {
 
using namespace Kokkos::utils::callbacks;
 
class SplitTest
    : public Tests::Utils::ExecutionSpaceContextTest<TEST_EXECUTION_SPACE>
    , public Kokkos::utils::tests::scoped::callbacks::Manager {
   public:
    using recorder_listener_t = RecorderListener<
        EventDiscardMatcher<TEST_EXECUTION_SPACE>,
        BeginFenceEvent,
        BeginParallelForEvent,
        Kokkos::Execution::Impl::RecordEvent,
        Kokkos::Execution::Impl::WaitEvent
    >;
};

TEST_F(SplitTest, split_and_sync_wait) {
    const context_t esc{exec};
 
    stdexec::sender auto chain = stdexec::schedule(esc.get_scheduler()) | experimental::execution::split();
 
    ASSERT_THAT(
        recorder_listener_t::record([chain = std::move(chain)]() mutable { stdexec::sync_wait(std::move(chain)); }),
        testing::IsEmpty());
}

TEST_F(SplitTest, within) {
    const view_s_t data(Kokkos::view_alloc(exec, "data - shared space"));
 
    experimental::execution::static_thread_pool pool{4};
    const context_t esc{exec};
 
    stdexec::sender auto fork = stdexec::schedule(pool.get_scheduler()) | experimental::execution::split();
 
    auto branch_a = fork | stdexec::continues_on(esc.get_scheduler()) | THEN_INCREMENT_ATOMIC(data)
                  | THEN_INCREMENT_ATOMIC(data);
    auto branch_b = fork | stdexec::continues_on(pool.get_scheduler()) | THEN_INCREMENT_ATOMIC(data);
    auto branch_c = std::move(fork) | stdexec::continues_on(esc.get_scheduler()) | THEN_INCREMENT_ATOMIC(data)
                  | THEN_INCREMENT_ATOMIC(data);
 
    auto chain = stdexec::when_all(std::move(branch_a), std::move(branch_b), std::move(branch_c))
               | stdexec::then([&data]() {
                     if (data() != 5)
                         Kokkos::abort("Synchronization issue.");
                 });
 
    ASSERT_EQ(data(), 0) << "Eager execution is not allowed.";
 
    const auto recorded_events = recorder_listener_t::record(
        [chain = std::move(chain)]() mutable { stdexec::sync_wait(std::move(chain)); });

    if constexpr (Kokkos::Execution::Impl::support_events<TEST_EXECUTION_SPACE>) {
        ASSERT_THAT(recorded_events, ::testing::SizeIs(8));
        ASSERT_THAT(
            recorded_events, ::testing::Contains(MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then"))).Times(4));
        ASSERT_THAT(recorded_events, ::testing::Contains(MATCHER_FOR_RECORD_EVENT(exec)).Times(2));
        std::ranges::for_each(
            recorded_events | std::views::filter([](const auto& event) -> bool {
                return std::holds_alternative<Kokkos::Execution::Impl::RecordEvent>(event);
            }),
            [&](const auto& event) {
                ASSERT_THAT(recorded_events, ::testing::Contains(MATCHER_FOR_WAIT_EVENT(event)).Times(1));
            });
    } else {
        ASSERT_THAT(
            recorded_events,
            testing::UnorderedElementsAre(
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "after dispatch")),
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "after dispatch"))));
    }
 
    ASSERT_EQ(data(), 5);
}
 
} // namespace Tests::ExecutionSpaceImpl