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project_6/cccl_upstream/cub/benchmarks/bench/reduce/custom.cu
EngineX CI 56fd68e7dd [INFRA] Import NVIDIA/CCCL upstream as optimization reference library
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
2026-07-30 09:35:51 +00:00

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// SPDX-FileCopyrightText: Copyright (c) 2011-2023, NVIDIA CORPORATION. All rights reserved.
// SPDX-License-Identifier: BSD-3
// This benchmark uses a custom reduction operation, max_t, which is not known to CUB, so no operator specific
// optimizations (e.g. using redux or DPX instructions) are performed. This benchmark covers the unoptimized code path.
// Because CUB cannot detect this operator, we cannot add any tunings based on the results of this benchmark. Its main
// use is to detect regressions.
#include <nvbench_helper.cuh>
using value_types = all_types;
using op_t = max_t;
#include "base.cuh"