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
87 lines
1.6 KiB
Plaintext
87 lines
1.6 KiB
Plaintext
#include <thrust/execution_policy.h>
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#include <thrust/reduce.h>
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#include <cuda/stream>
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#include <unittest/unittest.h>
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// Simple non-owning stream wrapper that allows implicit conversion to cudaStream_t.
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struct stream_wrapper
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{
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stream_wrapper(cudaStream_t s)
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: stream(s)
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{}
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operator cudaStream_t() const
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{
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return stream;
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}
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cudaStream_t stream;
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};
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// Simple non-owning stream wrapper that allows implicit conversion to cudaStream_t and cuda::stream_ref.
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struct stream_wrapper_ref
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{
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stream_wrapper_ref(cudaStream_t s)
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: stream(s)
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{}
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operator cudaStream_t() const
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{
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return stream;
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}
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operator cuda::stream_ref() const
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{
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return cuda::stream_ref(stream);
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}
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cudaStream_t stream;
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};
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template <typename Wrapper, typename ExecutionPolicy>
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void TestOnStream(ExecutionPolicy policy)
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{
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using Vector = thrust::device_vector<int>;
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Vector v(3);
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v[0] = 1;
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v[1] = -2;
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v[2] = 3;
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cudaStream_t s;
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cudaStreamCreate(&s);
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Wrapper wrapper(s);
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auto streampolicy = policy.on(wrapper);
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ASSERT_EQUAL(thrust::reduce(streampolicy, v.begin(), v.end()), 2);
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cudaStreamDestroy(s);
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}
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void TestCudartStreamSync()
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{
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TestOnStream<stream_wrapper>(thrust::cuda::par);
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}
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DECLARE_UNITTEST(TestCudartStreamSync);
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void TestCudartStreamNoSync()
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{
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TestOnStream<stream_wrapper>(thrust::cuda::par_nosync);
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}
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DECLARE_UNITTEST(TestCudartStreamNoSync);
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void TestCudaStreamRefSync()
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{
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TestOnStream<stream_wrapper_ref>(thrust::cuda::par);
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}
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DECLARE_UNITTEST(TestCudaStreamRefSync);
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void TestCudaStreamRefNoSync()
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{
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TestOnStream<stream_wrapper_ref>(thrust::cuda::par_nosync);
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}
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DECLARE_UNITTEST(TestCudaStreamRefNoSync);
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