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CUDA 11.2+ features are used via dlopen
By binding to the cudart 11.2 functions at runtime we remove the requirement that these symbols exist, therefore allowing RMM to be compiled with 11.2+ and used with 11.0 or 11.1.
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| /* | ||
| * Copyright (c) 2021-2022, NVIDIA CORPORATION. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #pragma once | ||
| #include <dlfcn.h> | ||
| #include <memory> | ||
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| namespace rmm::detail { | ||
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| /** | ||
| * @brief `dynamic_load_runtime` loads the cuda runtime library at runtime | ||
| * | ||
| * By loading the cudart library at runtime we can use functions that | ||
| * are added in newer minor versions of the cuda runtime. | ||
| */ | ||
| struct dynamic_load_runtime { | ||
| static constexpr auto dlclose_destructor = [](void* handle) { ::dlclose(handle); }; | ||
| inline static std::unique_ptr<void, decltype(dlclose_destructor)> cuda_runtime_lib{ | ||
| nullptr, dlclose_destructor}; | ||
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| static bool open_cuda_runtime() | ||
| { | ||
| if (!cuda_runtime_lib) { | ||
| ::dlerror(); | ||
| const int major = CUDART_VERSION / 1000; | ||
| const std::string libname_ver = "libcudart.so." + std::to_string(major) + ".0"; | ||
| const std::string libname = "libcudart.so"; | ||
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| auto ptr = ::dlopen(libname_ver.c_str(), RTLD_LAZY); | ||
| if (!ptr) { ::dlopen(libname.c_str(), RTLD_LAZY); } | ||
| if (!ptr) { return false; } | ||
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| cuda_runtime_lib.reset(ptr); | ||
| } | ||
| return true; | ||
| } | ||
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| template <typename... Args> | ||
| using function_return_type = std::add_pointer_t<cudaError_t(Args...)>; | ||
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| template <typename... Args> | ||
| static function_return_type<Args...> function(const char* func_name) | ||
| { | ||
| if (!open_cuda_runtime()) { return nullptr; } | ||
| auto* handle = ::dlsym(cuda_runtime_lib.get(), func_name); | ||
| if (!handle) { return nullptr; } | ||
| auto function_ptr = reinterpret_cast<function_return_type<Args...>>(handle); | ||
| return function_ptr; | ||
| } | ||
| }; | ||
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| /** | ||
| * @brief `async_alloc` bind to the Stream Ordered Memory Allocator functions | ||
| * at runtime. | ||
| * | ||
| * This allows us rmm users to compile/link against CUDA 11.2+ and run with | ||
| * < CUDA 11.2 runtime as these functions are found at call time | ||
| */ | ||
| struct async_alloc { | ||
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| static bool is_supported() | ||
| { | ||
| #if defined(RMM_STATIC_CUDART) | ||
| static bool has_support = (CUDART_VERSION >= 11020); | ||
| #else | ||
| static bool has_support = dynamic_load_runtime::function<void*>("cudaFreeAsync") != nullptr; | ||
| #endif | ||
| return has_support; | ||
| } | ||
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| #if defined(RMM_STATIC_CUDART) | ||
| #define RMM_SYNC_ALLOC_WRAPPER(name)\ | ||
| template <typename... Args> \ | ||
| static cudaError_t name(Args... args) { \ | ||
| return ::name(args...); \ | ||
| } | ||
| #else | ||
| #define RMM_SYNC_ALLOC_WRAPPER(name)\ | ||
| template <typename... Args> \ | ||
| static cudaError_t name(Args... args) { \ | ||
| static const auto func = dynamic_load_runtime::function<Args...>(#name); \ | ||
| return func(args...); \ | ||
| } | ||
| #endif | ||
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| RMM_SYNC_ALLOC_WRAPPER(cudaMemPoolCreate); | ||
| RMM_SYNC_ALLOC_WRAPPER(cudaMemPoolSetAttribute); | ||
| RMM_SYNC_ALLOC_WRAPPER(cudaMemPoolDestroy); | ||
| RMM_SYNC_ALLOC_WRAPPER(cudaMallocFromPoolAsync); | ||
| RMM_SYNC_ALLOC_WRAPPER(cudaFreeAsync); | ||
| }; | ||
| } // namespace rmm::detail |
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