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
56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
//===----------------------------------------------------------------------===//
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//
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// Part of CUDASTF in CUDA C++ Core Libraries,
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// under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// SPDX-FileCopyrightText: Copyright (c) 2022-2024 NVIDIA CORPORATION & AFFILIATES.
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//
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//===----------------------------------------------------------------------===//
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/**
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* @file
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*
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* @brief Implementation of the DOT kernel using a reduce access mode
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*
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*/
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#include <cuda/experimental/stf.cuh>
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using namespace cuda::experimental::stf;
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int main()
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{
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const size_t N = 16;
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double X[N], Y[N];
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double ref_res = 0.0;
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for (size_t i = 0; i < N; i++)
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{
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X[i] = cos(double(i));
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Y[i] = sin(double(i));
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// Compute the reference result of the DOT product of X and Y
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ref_res += X[i] * Y[i];
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}
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context ctx;
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auto lX = ctx.logical_data(X);
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auto lY = ctx.logical_data(Y);
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auto lsum = ctx.logical_data(shape_of<scalar_view<double>>());
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/* Compute sum(x_i * y_i)*/
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ctx.parallel_for(lY.shape(), lX.read(), lY.read(), lsum.reduce(reducer::sum<double>{}))
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->*[] __device__(size_t i, auto dX, auto dY, double& sum) {
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sum += dX(i) * dY(i);
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};
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double res = ctx.wait(lsum);
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ctx.finalize();
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_CCCL_ASSERT(fabs(res - ref_res) < 0.0001, "Invalid result");
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}
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