test_fork_join.cpp

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

 
namespace Tests::ExecutionSpaceImpl {
 
using namespace Kokkos::utils::callbacks;
 
class ForkJoinTest
    : 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(ForkJoinTest, diamond) {
    const view_s_t data(Kokkos::view_alloc("data - shared space"));
 
    experimental::execution::static_thread_pool pool{4};
    const context_t esc{exec};
 
    auto sndr =
        stdexec::schedule(pool.get_scheduler())
        | stdexec::then(Tests::Utils::Functors::LoadCheckAdd<int, false>{.prev = 0, .value = 4, .data = data.data()})
        | experimental::execution::fork_join(
            stdexec::continues_on(esc.get_scheduler())
                | Tests::Utils::check_scheduler_type<stdexec::set_value_t, scheduler_t>() | THEN_INCREMENT_ATOMIC(data)
                | stdexec::continues_on(pool.get_scheduler()),
            stdexec::continues_on(pool.get_scheduler()) | THEN_INCREMENT_ATOMIC(data))
        | stdexec::continues_on(esc.get_scheduler())
        | stdexec::then(
            Tests::Utils::Functors::LoadCheckAdd<int, on_device>{.prev = 6, .value = 3, .data = data.data()})
        | stdexec::continues_on(stdexec::inline_scheduler{})
        | stdexec::then(Tests::Utils::Functors::LoadCheckAdd<int, false>{.prev = 9, .value = 5, .data = data.data()});
 
    ASSERT_EQ(data(), 0) << "Eager execution is not allowed.";
 
    KOKKOS_EXECUTION_THREADS_THROWS_ON_SYNC_WAIT_ASSERT_AND_SKIP(sndr)
 
    ASSERT_THAT(
        Tests::Utils::record_sync_wait<recorder_listener_t>(std::move(sndr)),
        testing::ElementsAre(
            MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
            MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "schedule_from")),
            MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
            MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "schedule_from"))));
 
    ASSERT_EQ(data(), 14);
}

TEST_F(ForkJoinTest, continues_on) {
    const view_s_t data(Kokkos::view_alloc(exec, "data - shared space"));
 
    const context_t esc{exec};
 
    auto sndr =
        stdexec::just() | stdexec::continues_on(esc.get_scheduler())
        | experimental::execution::fork_join(
            stdexec::continues_on(esc.get_scheduler())
            | stdexec::then(
                Tests::Utils::Functors::LoadCheckAdd<int, on_device>{.prev = 0, .value = 3, .data = data.data()}));
 
    static_assert(stdexec::__sender_for<decltype(sndr), experimental::execution::fork_join_t>);
 
    ASSERT_EQ(data(), 0) << "Eager execution is not allowed.";
 
    const auto recorded_events = Tests::Utils::record_sync_wait<recorder_listener_t>(
        std::move(sndr)); // NOLINT(performance-move-const-arg)
 
    ASSERT_THAT(recorded_events, [&]() {
        if constexpr (Kokkos::Execution::Impl::has_non_blocking_dispatch<TEST_EXECUTION_SPACE>) {
            return testing::ElementsAre(
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_RECORD_EVENT(exec),
                MATCHER_FOR_WAIT_EVENT(recorded_events.at(1)));
        } else {
            return testing::ElementsAre(
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "after dispatch")));
        }
    }());
 
    ASSERT_EQ(data(), 3);
}

TEST_F(ForkJoinTest, continues_on_bulk) {
    const view_s_t data(Kokkos::view_alloc(exec, "data - shared space"));
 
    const context_t esc{exec};
 
    auto sndr =
        stdexec::just() | stdexec::continues_on(esc.get_scheduler()) | BULK_SUM_INDICES(2, data)
        | experimental::execution::fork_join(
            stdexec::continues_on(esc.get_scheduler())
            | stdexec::then(
                Tests::Utils::Functors::LoadCheckAdd<int, on_device>{.prev = 1, .value = 2, .data = data.data()}));
 
    ASSERT_EQ(data(), 0) << "Eager execution is not allowed.";
 
    const auto recorded_events = Tests::Utils::record_sync_wait<recorder_listener_t>(std::move(sndr));
 
    ASSERT_THAT(recorded_events, [&]() {
        if constexpr (Kokkos::Execution::Impl::has_non_blocking_dispatch<TEST_EXECUTION_SPACE>) {
            return testing::ElementsAre(
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "bulk")),
                MATCHER_FOR_RECORD_EVENT(exec),
                MATCHER_FOR_WAIT_EVENT(recorded_events.at(1)),
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_RECORD_EVENT(exec),
                MATCHER_FOR_WAIT_EVENT(recorded_events.at(4)));
        } else {
            return testing::ElementsAre(
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "bulk")),
                MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "after dispatch")),
                MATCHER_FOR_BEGIN_PFOR(exec, dispatch_label(exec, "then")),
                MATCHER_FOR_BEGIN_FENCE(exec, dispatch_label(exec, "after dispatch")));
        }
    }());
 
    ASSERT_EQ(data(), 3);
}
 
} // namespace Tests::ExecutionSpaceImpl