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
75 lines
1.6 KiB
Plaintext
75 lines
1.6 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) 2022-2025 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 Ensure a graph_ctx can be used concurrently
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*
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*/
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#include <cuda/experimental/stf.cuh>
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#include <mutex>
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#include <thread>
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using namespace cuda::experimental::stf;
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void mytask(graph_ctx ctx, int /*id*/)
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{
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const size_t N = 16;
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int alpha = 3;
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auto lX = ctx.logical_data<int>(N);
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auto lY = ctx.logical_data<int>(N);
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ctx.parallel_for(lX.shape(), lX.write(), lY.write())->*[] __device__(size_t i, auto x, auto y) {
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x(i) = (1 + i);
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y(i) = (2 + i * i);
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};
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/* Compute Y = Y + alpha X */
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for (size_t i = 0; i < 200; i++)
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{
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ctx.parallel_for(lY.shape(), lY.rw(), lX.read())->*[alpha] __device__(size_t i, auto dY, auto dX) {
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dY(i) += alpha * dX(i);
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};
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}
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ctx.host_launch(lX.read(), lY.read())->*[alpha](auto x, auto y) {
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for (size_t i = 0; i < N; i++)
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{
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EXPECT(x(i) == 1 + i);
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EXPECT(y(i) == 2 + i * i + 200 * alpha * x(i));
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}
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};
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}
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int main()
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{
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graph_ctx ctx;
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::std::vector<::std::thread> threads;
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// Launch threads
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for (int i = 0; i < 10; ++i)
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{
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threads.emplace_back(mytask, ctx, i);
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}
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// Wait for all threads to complete.
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for (auto& th : threads)
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{
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th.join();
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}
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ctx.finalize();
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}
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