56fd68e7dd
CCCL (CUDA C++ Core Libraries) provides: - CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk) - Thrust: high-level parallel algorithms (transform_reduce, sort, scan) - libcudacxx: CUDA C++ standard library (atomics, barriers, memory) - cudax: experimental features (memory resources, allocators) - Tuning policies: per-SM hardware-specific algorithm parameters Competition optimization vectors mapped to CCCL: - Output TPS (83% weight): warp_reduce, block_reduce, device_topk - Input TPS (14% weight): device_scan, block_load, prefetch - Cache TPS (3% weight): prefix caching strategy patterns - Memory (0.9 util): pooled/cached/buddy allocators Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only) License: Apache-2.0
131 lines
4.0 KiB
Plaintext
131 lines
4.0 KiB
Plaintext
#include <thrust/device_ptr.h>
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#include <thrust/device_vector.h>
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#include <thrust/functional.h>
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#include <thrust/iterator/counting_iterator.h>
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#include <thrust/iterator/transform_iterator.h>
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#include <unittest/unittest.h>
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_CCCL_DIAG_PUSH
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_CCCL_DIAG_SUPPRESS_MSVC(4244 4267) // possible loss of data
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template <typename Iterator1, typename Iterator2>
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#if THRUST_DEVICE_SYSTEM == THRUST_DEVICE_SYSTEM_CUDA
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__global__
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#endif
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void
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simple_copy_on_device(Iterator1 first1, Iterator1 last1, Iterator2 first2)
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{
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while (first1 != last1)
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{
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*(first2++) = *(first1++);
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}
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}
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template <typename Iterator1, typename Iterator2>
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void simple_copy(Iterator1 first1, Iterator1 last1, Iterator2 first2)
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{
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#if THRUST_DEVICE_SYSTEM == THRUST_DEVICE_SYSTEM_CUDA
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simple_copy_on_device<<<1, 1>>>(first1, last1, first2);
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#else
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simple_copy_on_device(first1, last1, first2);
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#endif
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}
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void TestDeviceDereferenceDeviceVectorIterator()
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{
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thrust::device_vector<int> input = unittest::random_integers<int>(100);
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thrust::device_vector<int> output(input.size(), 0);
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simple_copy(input.begin(), input.end(), output.begin());
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ASSERT_EQUAL(input, output);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceDeviceVectorIterator);
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void TestDeviceDereferenceDevicePtr()
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{
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thrust::device_vector<int> input = unittest::random_integers<int>(100);
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thrust::device_vector<int> output(input.size(), 0);
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thrust::device_ptr<int> _first1 = &input[0];
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thrust::device_ptr<int> _last1 = _first1 + static_cast<std::ptrdiff_t>(input.size());
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thrust::device_ptr<int> _first2 = &output[0];
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simple_copy(_first1, _last1, _first2);
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ASSERT_EQUAL(input, output);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceDevicePtr);
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void TestDeviceDereferenceTransformIterator()
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{
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thrust::device_vector<int> input = unittest::random_integers<int>(100);
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thrust::device_vector<int> output(input.size(), 0);
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simple_copy(thrust::make_transform_iterator(input.begin(), ::cuda::std::identity{}),
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thrust::make_transform_iterator(input.end(), ::cuda::std::identity{}),
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output.begin());
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ASSERT_EQUAL(input, output);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceTransformIterator);
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void TestDeviceDereferenceTransformIteratorInputConversion()
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{
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thrust::device_vector<int> input = unittest::random_integers<int>(100);
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thrust::device_vector<double> output(input.size(), 0);
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simple_copy(thrust::make_transform_iterator(input.begin(), ::cuda::std::identity{}),
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thrust::make_transform_iterator(input.end(), ::cuda::std::identity{}),
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output.begin());
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ASSERT_EQUAL(input == output, true);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceTransformIteratorInputConversion);
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void TestDeviceDereferenceTransformIteratorOutputConversion()
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{
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thrust::device_vector<int> input = unittest::random_integers<int>(100);
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thrust::device_vector<double> output(input.size(), 0);
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simple_copy(thrust::make_transform_iterator(input.begin(), ::cuda::std::identity{}),
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thrust::make_transform_iterator(input.end(), ::cuda::std::identity{}),
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output.begin());
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ASSERT_EQUAL(input == output, true);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceTransformIteratorOutputConversion);
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void TestDeviceDereferenceCountingIterator()
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{
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thrust::counting_iterator<int> first(1);
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thrust::counting_iterator<int> last(6);
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thrust::device_vector<int> output(5);
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simple_copy(first, last, output.begin());
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thrust::device_vector<int> ref{1, 2, 3, 4, 5};
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ASSERT_EQUAL(output, ref);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceCountingIterator);
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void TestDeviceDereferenceTransformedCountingIterator()
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{
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thrust::counting_iterator<int> first(1);
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thrust::counting_iterator<int> last(6);
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thrust::device_vector<int> output(5);
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simple_copy(thrust::make_transform_iterator(first, ::cuda::std::negate<int>()),
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thrust::make_transform_iterator(last, ::cuda::std::negate<int>()),
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output.begin());
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thrust::device_vector<int> ref{-1, -2, -3, -4, -5};
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ASSERT_EQUAL(output, ref);
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}
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DECLARE_UNITTEST(TestDeviceDereferenceTransformedCountingIterator);
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_CCCL_DIAG_POP
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