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
99 lines
2.9 KiB
Plaintext
99 lines
2.9 KiB
Plaintext
//===----------------------------------------------------------------------===//
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//
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// Part of CUDA Experimental 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) 2025 NVIDIA CORPORATION & AFFILIATES.
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//
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//===----------------------------------------------------------------------===//
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#include <cuda/experimental/execution.cuh>
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#include "common/checked_receiver.cuh"
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#include "common/utility.cuh"
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#include "testing.cuh"
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namespace ex = cuda::experimental::execution;
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namespace
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{
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// Custom domain for testing
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struct my_domain
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{};
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// Simple test query
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struct query1_t : ex::forwarding_query_t
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{
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template <class Env>
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_CCCL_HOST_DEVICE_API auto operator()(const Env& env) const noexcept -> decltype(env.query(*this))
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{
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return env.query(*this);
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}
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};
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inline constexpr auto query1 = query1_t{};
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} // namespace
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C2H_TEST("write_env basic functionality", "[write_env][adaptors]")
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{
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// Test that write_env wraps a sender and adds environment information
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auto env = ex::prop{query1, 42};
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auto sndr = ex::write_env(ex::just(42), env);
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auto op = ex::connect(std::move(sndr), checked_value_receiver{42});
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ex::start(op);
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// the receiver will check the result
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}
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C2H_TEST("write_env pipe syntax", "[write_env][adaptors]")
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{
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// Test that write_env supports pipe syntax (sndr | write_env(env))
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auto env = ex::prop{query1, 42};
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auto sndr = ex::just(42) | ex::write_env(env);
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auto op = ex::connect(std::move(sndr), checked_value_receiver{42});
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ex::start(op);
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// the receiver will check the result
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}
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#if _CCCL_HOST_COMPILATION()
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C2H_TEST("write_env updates the receiver's environment", "[write_env][adaptors]")
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{
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auto sndr = ex::just() | ex::let_value([]() {
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return ex::read_env(query1);
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})
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| ex::write_env(ex::prop{query1, 42});
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auto [result] = ex::sync_wait(std::move(sndr)).value();
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CHECK(result == 42);
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}
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struct fake_allocator
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{};
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C2H_TEST("write_env does not hide the receiver's environment", "[write_env][adaptors]")
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{
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auto sndr = ex::just() | ex::let_value([]() {
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return ex::read_env(ex::get_allocator);
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})
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| ex::write_env(ex::prop{query1, 42});
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auto env = ex::prop{ex::get_allocator, fake_allocator{}};
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auto [result] = ex::sync_wait(std::move(sndr), env).value();
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STATIC_REQUIRE(std::is_same_v<decltype(result), fake_allocator>);
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}
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C2H_TEST("write_env prefers the passed env over the receiver's env", "[write_env][adaptors]")
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{
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auto sndr = ex::just() | ex::let_value([]() {
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return ex::read_env(query1);
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})
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| ex::write_env(ex::prop{query1, 42});
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auto env = ex::prop{query1, 100};
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auto [result] = ex::sync_wait(std::move(sndr), env).value();
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CHECK(result == 42);
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}
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#endif // _CCCL_HOST_COMPILATION()
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