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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#include <Kokkos_Core.hpp>
namespace Test {
namespace {
struct TestIsAsynchFunctor {
Kokkos::View<double, TEST_EXECSPACE> atomic_test;
TestIsAsynchFunctor(Kokkos::View<double, TEST_EXECSPACE> atomic_test_)
: atomic_test(atomic_test_) {}
KOKKOS_INLINE_FUNCTION
void operator()(const int) const { Kokkos::atomic_add(&atomic_test(), 1.0); }
};
template <class PolicyType, class ReduceFunctor>
void test_reduce_device_view(int64_t N, PolicyType policy,
ReduceFunctor functor) {
using ExecSpace = TEST_EXECSPACE;
Kokkos::View<int64_t, TEST_EXECSPACE> result("Result");
Kokkos::View<double, TEST_EXECSPACE> atomic_test("Atomic");
int64_t reducer_result, view_result, scalar_result;
Kokkos::Timer timer;
// Establish whether execspace is asynchronous
Kokkos::parallel_for("Test::ReduceDeviceView::TestIsAsynch",
Kokkos::RangePolicy<TEST_EXECSPACE>(0, 1000000),
TestIsAsynchFunctor(atomic_test));
double time0 = timer.seconds();
timer.reset();
typename ExecSpace::execution_space().fence();
double time_fence0 = timer.seconds();
Kokkos::deep_copy(result, 0);
// We need a warm-up to get reasonable results
Kokkos::parallel_reduce("Test::ReduceDeviceView::TestReducer", policy,
functor,
Kokkos::Sum<int64_t, TEST_EXECSPACE>(result));
Kokkos::fence();
timer.reset();
bool is_async = time0 < time_fence0;
// Test Reducer
Kokkos::parallel_reduce("Test::ReduceDeviceView::TestReducer", policy,
functor,
Kokkos::Sum<int64_t, TEST_EXECSPACE>(result));
double time1 = timer.seconds();
// Check whether it was asyncronous
timer.reset();
typename ExecSpace::execution_space().fence();
double time_fence1 = timer.seconds();
Kokkos::deep_copy(reducer_result, result);
Kokkos::deep_copy(result, 0);
ASSERT_EQ(N, reducer_result);
// We need a warm-up to get reasonable results
Kokkos::parallel_reduce("Test::ReduceDeviceView::TestView", policy, functor,
result);
Kokkos::fence();
timer.reset();
// Test View
Kokkos::parallel_reduce("Test::ReduceDeviceView::TestView", policy, functor,
result);
double time2 = timer.seconds();
// Check whether it was asyncronous
timer.reset();
typename ExecSpace::execution_space().fence();
double time_fence2 = timer.seconds();
Kokkos::deep_copy(view_result, result);
Kokkos::deep_copy(result, 0);
ASSERT_EQ(N, view_result);
timer.reset();
// Test Scalar
Kokkos::parallel_reduce("Test::ReduceDeviceView::TestScalar", policy, functor,
scalar_result);
double time3 = timer.seconds();
// Check whether it was asyncronous
timer.reset();
typename ExecSpace::execution_space().fence();
double time_fence3 = timer.seconds();
ASSERT_EQ(N, scalar_result);
if (is_async) {
ASSERT_LT(time1, time_fence1);
}
if (is_async) {
ASSERT_LT(time2, time_fence2);
ASSERT_GT(time3, time_fence3);
}
}
struct RangePolicyFunctor {
KOKKOS_INLINE_FUNCTION
void operator()(const int, int64_t& lsum) const { lsum += 1; }
};
struct MDRangePolicyFunctor {
KOKKOS_INLINE_FUNCTION
void operator()(const int, const int, const int, int64_t& lsum) const {
lsum += 1;
}
};
struct TeamPolicyFunctor {
int M;
TeamPolicyFunctor(int M_) : M(M_) {}
KOKKOS_INLINE_FUNCTION
void operator()(const Kokkos::TeamPolicy<TEST_EXECSPACE>::member_type& team,
int64_t& lsum) const {
for (int i = team.team_rank(); i < M; i += team.team_size()) lsum += 1;
}
};
} // namespace
TEST(TEST_CATEGORY, reduce_device_view_range_policy) {
// Avoid running out of memory
#ifdef KOKKOS_ENABLE_SYCL
int N = 100 * 1024 * 1024;
#else
int N = 1000 * 1024 * 1024;
#endif
test_reduce_device_view(N, Kokkos::RangePolicy<TEST_EXECSPACE>(0, N),
RangePolicyFunctor());
}
TEST(TEST_CATEGORY, reduce_device_view_mdrange_policy) {
int N = 1000 * 1024 * 1024;
test_reduce_device_view(
N,
Kokkos::MDRangePolicy<TEST_EXECSPACE, Kokkos::Rank<3>>(
{0, 0, 0}, {1000, 1024, 1024}),
MDRangePolicyFunctor());
}
TEST(TEST_CATEGORY, reduce_device_view_team_policy) {
// FIXME_SYCL The number of workgroups on CUDA devices can not be larger than
// 65535
#ifdef KOKKOS_ENABLE_SYCL
int N = 63 * 1024 * 1024;
test_reduce_device_view(
N, Kokkos::TeamPolicy<TEST_EXECSPACE>(63 * 1024, Kokkos::AUTO),
TeamPolicyFunctor(1024));
#else
int N = 1000 * 1024 * 1024;
test_reduce_device_view(
N, Kokkos::TeamPolicy<TEST_EXECSPACE>(1000 * 1024, Kokkos::AUTO),
TeamPolicyFunctor(1024));
#endif
}
} // namespace Test
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