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
126 lines
3.9 KiB
Plaintext
126 lines
3.9 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) 2024 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 "testing.cuh"
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namespace ex = cudax::execution;
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__host__ __device__ bool _on_device() noexcept
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{
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NV_IF_ELSE_TARGET(NV_IS_HOST, //
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({ return false; }),
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({ return true; }));
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}
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auto const main_thread_id = ::std::this_thread::get_id();
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void simple_start_on_thread_test()
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{
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ex::thread_context ctx;
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auto sch = ctx.get_scheduler();
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auto sndr = ex::on(sch, ex::just() | ex::then([] {
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CHECK(::std::this_thread::get_id() != main_thread_id);
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}))
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| ex::then([]() -> int {
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CHECK(::std::this_thread::get_id() == main_thread_id);
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return 42;
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});
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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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void simple_continue_on_thread_test()
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{
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ex::thread_context ctx;
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auto sch = ctx.get_scheduler();
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auto sndr = ex::just() | ex::on(sch, ex::then([] {
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CHECK(::std::this_thread::get_id() != main_thread_id);
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}))
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| ex::then([]() -> int {
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CHECK(::std::this_thread::get_id() == main_thread_id);
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return 42;
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});
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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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void simple_start_on_stream_test()
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{
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cudax::stream str{cuda::device_ref(0)};
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auto sch = cudax::stream_ref{str};
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auto sndr = ex::on(sch, ex::just(42) | ex::then([] __host__ __device__(int i) noexcept -> int {
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return _on_device() ? i : -i;
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}))
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| ex::then([] __host__ __device__(int i) noexcept -> int {
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return _on_device() ? -1 : i;
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});
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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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void simple_continue_on_stream_test()
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{
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cudax::stream str{cuda::device_ref(0)};
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auto sch = cudax::stream_ref{str};
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auto sndr = ex::just(42) | ex::on(sch, ex::then([] __host__ __device__(int i) noexcept -> int {
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return _on_device() ? i : -i;
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}))
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| ex::then([] __host__ __device__(int i) noexcept -> int {
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return _on_device() ? -1 : i;
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});
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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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void test_continues_on_updates_env()
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{
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ex::thread_context ctx;
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auto sch = ctx.get_scheduler();
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auto sndr = ex::just() | ex::on(sch, ex::let_value([] {
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return ex::read_env(ex::get_scheduler);
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}))
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| ex::then([](auto sch2) -> int {
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STATIC_REQUIRE(cuda::std::same_as<decltype(sch2), decltype(sch)>);
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return 42;
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});
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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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namespace
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{
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C2H_TEST("simple on(sch, sndr) thread test", "[on]")
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{
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simple_start_on_thread_test();
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}
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C2H_TEST("simple on(sndr, sch, closure) thread test", "[on]")
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{
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simple_continue_on_thread_test();
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}
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C2H_TEST("simple on(sch, sndr) stream test", "[on][stream]")
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{
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simple_start_on_stream_test();
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}
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C2H_TEST("simple on(sndr, sch, closure) stream test", "[on][stream]")
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{
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simple_continue_on_stream_test();
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}
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C2H_TEST("test that on(sndr, sch, closure) updates the env for closure", "[on][stream]")
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{
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test_continues_on_updates_env();
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}
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} // namespace
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