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/**
* Copyright 2021-2024, XGBoost Contributors
*/
#include <gtest/gtest.h>
#include <thrust/copy.h> // thrust::copy
#include "../../../src/common/device_helpers.cuh"
#include "../../../src/common/threading_utils.cuh"
#include "../helpers.h" // for MakeCUDACtx
namespace xgboost::common {
TEST(SegmentedTrapezoidThreads, Basic) {
size_t constexpr kElements = 24, kGroups = 3;
auto ctx = MakeCUDACtx(0);
dh::device_vector<size_t> offset_ptr(kGroups + 1, 0);
offset_ptr[0] = 0;
offset_ptr[1] = 8;
offset_ptr[2] = 16;
offset_ptr[kGroups] = kElements;
size_t h = 1;
dh::device_vector<size_t> thread_ptr(kGroups + 1, 0);
size_t total = SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
ASSERT_EQ(total, kElements - kGroups);
h = 2;
SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
std::vector<size_t> h_thread_ptr(thread_ptr.size());
thrust::copy(thread_ptr.cbegin(), thread_ptr.cend(), h_thread_ptr.begin());
for (size_t i = 1; i < h_thread_ptr.size(); ++i) {
ASSERT_EQ(h_thread_ptr[i] - h_thread_ptr[i - 1], 13);
}
h = 7;
SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
thrust::copy(thread_ptr.cbegin(), thread_ptr.cend(), h_thread_ptr.begin());
for (size_t i = 1; i < h_thread_ptr.size(); ++i) {
ASSERT_EQ(h_thread_ptr[i] - h_thread_ptr[i - 1], 28);
}
}
TEST(SegmentedTrapezoidThreads, Unravel) {
size_t i = 0, j = 0;
size_t constexpr kN = 8;
UnravelTrapeziodIdx(6, kN, &i, &j);
ASSERT_EQ(i, 0);
ASSERT_EQ(j, 7);
UnravelTrapeziodIdx(12, kN, &i, &j);
ASSERT_EQ(i, 1);
ASSERT_EQ(j, 7);
UnravelTrapeziodIdx(15, kN, &i, &j);
ASSERT_EQ(i, 2);
ASSERT_EQ(j, 5);
UnravelTrapeziodIdx(21, kN, &i, &j);
ASSERT_EQ(i, 3);
ASSERT_EQ(j, 7);
UnravelTrapeziodIdx(25, kN, &i, &j);
ASSERT_EQ(i, 5);
ASSERT_EQ(j, 6);
UnravelTrapeziodIdx(27, kN, &i, &j);
ASSERT_EQ(i, 6);
ASSERT_EQ(j, 7);
}
} // namespace xgboost::common
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