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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 <gtest/gtest.h>
#include <Kokkos_Core.hpp>
#include <cstdio>
// This test checks parallel_scan() calls which use RangePolicy.
namespace {
template <typename ValueType>
struct TestParallelScanRangePolicy {
// This typedef is needed for parallel_scan() where a
// work count is given (instead of a RangePolicy) so
// that the execution space can be deduced internally.
using execution_space = TEST_EXECSPACE;
using ViewType = Kokkos::View<ValueType*, execution_space>;
ViewType prefix_results;
ViewType postfix_results;
// Operator defining work done in parallel_scan.
// Simple scan over [0,1,...,N-1].
// Compute both prefix and postfix scans.
KOKKOS_INLINE_FUNCTION
void operator()(const size_t i, ValueType& update, bool final_pass) const {
if (final_pass) {
prefix_results(i) = update;
}
update += i;
if (final_pass) {
postfix_results(i) = update;
}
}
KOKKOS_INLINE_FUNCTION
void init(ValueType& update) const { update = 0; }
KOKKOS_INLINE_FUNCTION
void join(ValueType& update, const ValueType& input) const {
update += input;
}
template <typename... Args>
void test_scan(const size_t work_size) {
// Reset member data based on work_size
prefix_results = ViewType("prefix_results", work_size);
postfix_results = ViewType("postfix_results", work_size);
// Lambda for checking errors from stored value at each index.
auto check_scan_results = [&]() {
auto const prefix_h = Kokkos::create_mirror_view_and_copy(
Kokkos::HostSpace(), prefix_results);
auto const postfix_h = Kokkos::create_mirror_view_and_copy(
Kokkos::HostSpace(), postfix_results);
for (size_t i = 0; i < work_size; ++i) {
// Check prefix sum
ASSERT_EQ(
static_cast<ValueType>((static_cast<ValueType>(i) * (i - 1)) / 2),
prefix_h(i));
// Check postfix sum
ASSERT_EQ(
static_cast<ValueType>((static_cast<ValueType>(i) * (i + 1)) / 2),
postfix_h(i));
}
// Reset results
Kokkos::deep_copy(prefix_results, 0);
Kokkos::deep_copy(postfix_results, 0);
};
// If policy template args are not given, call parallel_scan()
// with work_size input, if args are given, call
// parallel_scan() with RangePolicy<Args...>(0, work_size).
// For each case, call parallel_scan() with all possible
// function signatures.
if (sizeof...(Args) == 0) {
// Input: label, work_count, functor
Kokkos::parallel_scan("TestWithStrArg1", work_size, *this);
check_scan_results();
// Input: work_count, functor
Kokkos::parallel_scan(work_size, *this);
check_scan_results();
// Input: label, work_count, functor
// Input/Output: return_value
{
ValueType return_val = 0;
Kokkos::parallel_scan("TestWithStrArg2", work_size, *this, return_val);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_val); // sum( 0 .. N-1 )
}
// Input: work_count, functor
// Input/Output: return_value
{
ValueType return_val = 0;
Kokkos::parallel_scan(work_size, *this, return_val);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_val); // sum( 0 .. N-1 )
}
// Input: work_count, functor
// Input/Output: return_view (host space)
{
Kokkos::View<ValueType, Kokkos::HostSpace> return_view("return_view");
Kokkos::parallel_scan(work_size, *this, return_view);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_view()); // sum( 0 .. N-1 )
}
} else {
// Construct RangePolicy for parallel_scan
// based on template Args and work_size.
Kokkos::RangePolicy<execution_space, Args...> policy(0, work_size);
// Input: label, work_count, functor
Kokkos::parallel_scan("TestWithStrArg3", policy, *this);
check_scan_results();
// Input: work_count, functor
Kokkos::parallel_scan(policy, *this);
check_scan_results();
{
// Input: label, work_count, functor
// Input/Output: return_value
ValueType return_val = 0;
Kokkos::parallel_scan("TestWithStrArg4", policy, *this, return_val);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_val); // sum( 0 .. N-1 )
}
// Input: work_count, functor
// Input/Output: return_value
{
ValueType return_val = 0;
Kokkos::parallel_scan(policy, *this, return_val);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_val); // sum( 0 .. N-1 )
}
// Input: work_count, functor
// Input/Output: return_view (Device)
{
Kokkos::View<ValueType, execution_space> return_view("return_view");
Kokkos::parallel_scan(policy, *this, return_view);
check_scan_results();
ValueType total;
Kokkos::deep_copy(total, return_view);
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
total); // sum( 0 .. N-1 )
}
// Check Kokkos::Experimental::require()
// for one of the signatures.
{
using Property =
Kokkos::Experimental::WorkItemProperty::HintLightWeight_t;
const auto policy_with_require =
Kokkos::Experimental::require(policy, Property());
// Input: work_count, functor
// Input/Output: return_value
ValueType return_val = 0;
Kokkos::parallel_scan(policy_with_require, *this, return_val);
check_scan_results();
ASSERT_EQ(static_cast<ValueType>(static_cast<ValueType>(work_size) *
(work_size - 1) / 2),
return_val); // sum( 0 .. N-1 )
}
}
}
// Run test_scan() for a collection of work size
template <typename... Args>
void test_scan(const std::vector<size_t> work_sizes) {
for (size_t i = 0; i < work_sizes.size(); ++i) {
test_scan<Args...>(work_sizes[i]);
}
}
}; // struct TestParallelScanRangePolicy
TEST(TEST_CATEGORY, parallel_scan_range_policy) {
{
TestParallelScanRangePolicy<char> f;
std::vector<size_t> work_sizes{5, 10};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
{
TestParallelScanRangePolicy<short int> f;
std::vector<size_t> work_sizes{50, 100};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
{
TestParallelScanRangePolicy<int> f;
std::vector<size_t> work_sizes{0, 1, 2, 1000, 1001};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
{
TestParallelScanRangePolicy<long int> f;
std::vector<size_t> work_sizes{1000, 10000};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
{
TestParallelScanRangePolicy<float> f;
std::vector<size_t> work_sizes{13, 34};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
{
TestParallelScanRangePolicy<double> f;
std::vector<size_t> work_sizes{17, 59};
f.test_scan<>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Static>>(work_sizes);
f.test_scan<Kokkos::Schedule<Kokkos::Dynamic>>(work_sizes);
}
}
} // namespace
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