DevCpu.hpp

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/* Copyright 2024 Axel Huebl, Benjamin Worpitz, Matthias Werner, Jan Stephan, Bernhard Manfred Gruber,
 *                Antonio Di Pilato, Andrea Bocci
 * SPDX-License-Identifier: MPL-2.0
 */
 
#pragma once
 
#include "alpaka/dev/Traits.hpp"
#include "alpaka/dev/common/DevGenericImpl.hpp"
#include "alpaka/dev/cpu/SysInfo.hpp"
#include "alpaka/mem/buf/Traits.hpp"
#include "alpaka/platform/Traits.hpp"
#include "alpaka/queue/Properties.hpp"
#include "alpaka/queue/QueueGenericThreadsBlocking.hpp"
#include "alpaka/queue/QueueGenericThreadsNonBlocking.hpp"
#include "alpaka/queue/Traits.hpp"
#include "alpaka/queue/cpu/IGenericThreadsQueue.hpp"
#include "alpaka/traits/Traits.hpp"
#include "alpaka/wait/Traits.hpp"
 
#include <algorithm>
#include <cstddef>
#include <map>
#include <memory>
#include <mutex>
#include <string>
#include <vector>
 
namespace alpaka
{
    class DevCpu;
 
    namespace cpu
    {
        using ICpuQueue = IGenericThreadsQueue<DevCpu>;
    } // namespace cpu
 
    namespace trait
    {
        template<typename TPlatform, typename TSfinae>
        struct GetDevByIdx;
    } // namespace trait
    struct PlatformCpu;
 
    //! The CPU device.
    namespace cpu::detail
    {
        //! The CPU device implementation.
        using DevCpuImpl = alpaka::detail::DevGenericImpl<cpu::ICpuQueue>;
    } // namespace cpu::detail
 
    //! The CPU device handle.
    class DevCpu
        : public interface::Implements<ConceptCurrentThreadWaitFor, DevCpu>
        , public interface::Implements<ConceptDev, DevCpu>
    {
        friend struct trait::GetDevByIdx<PlatformCpu>;
 
    protected:
        DevCpu() : m_spDevCpuImpl(std::make_shared<cpu::detail::DevCpuImpl>())
        {
        }
 
    public:
        auto operator==(DevCpu const&) const -> bool
        {
            return true;
        }
 
        auto operator!=(DevCpu const& rhs) const -> bool
        {
            return !((*this) == rhs);
        }
 
        [[nodiscard]] ALPAKA_FN_HOST auto getAllQueues() const -> std::vector<std::shared_ptr<cpu::ICpuQueue>>
        {
            return m_spDevCpuImpl->getAllExistingQueues();
        }
 
        //! Registers the given queue on this device.
        //! NOTE: Every queue has to be registered for correct functionality of device wait operations!
        ALPAKA_FN_HOST auto registerQueue(std::shared_ptr<cpu::ICpuQueue> spQueue) const -> void
        {
            m_spDevCpuImpl->registerQueue(spQueue);
        }
 
        [[nodiscard]] auto getNativeHandle() const noexcept
        {
            return 0;
        }
 
        static void setDeviceProperties(alpaka::DevCpu const&, alpaka::DeviceProperties& devProperties)
        {
            devProperties.name = cpu::detail::getCpuName();
            devProperties.totalGlobalMem = cpu::detail::getTotalGlobalMemSizeBytes();
        }
 
        friend struct trait::GetName<DevCpu>;
        friend struct trait::GetMemBytes<DevCpu>;
        friend struct trait::GetFreeMemBytes<DevCpu>;
        friend struct trait::GetWarpSizes<DevCpu>;
        friend struct trait::GetPreferredWarpSize<DevCpu>;
 
    private:
        std::shared_ptr<cpu::detail::DevCpuImpl> m_spDevCpuImpl;
    };
 
    namespace trait
    {
 
        //! The CPU device name get trait specialization.
        template<>
        struct GetName<DevCpu>
        {
            ALPAKA_FN_HOST static auto getName(DevCpu const& dev) -> std::string
            {
                return dev.m_spDevCpuImpl->deviceProperties(dev)->name;
            }
        };
 
        //! The CPU device available memory get trait specialization.
        template<>
        struct GetMemBytes<DevCpu>
        {
            ALPAKA_FN_HOST static auto getMemBytes(DevCpu const& dev) -> std::size_t
            {
                return dev.m_spDevCpuImpl->deviceProperties(dev)->totalGlobalMem;
            }
        };
 
        //! The CPU device free memory get trait specialization.
        template<>
        struct GetFreeMemBytes<DevCpu>
        {
            ALPAKA_FN_HOST static auto getFreeMemBytes(DevCpu const& /* dev */) -> std::size_t
            {
                return cpu::detail::getFreeGlobalMemSizeBytes();
            }
        };
 
        //! The CPU device warp size get trait specialization.
        template<>
        struct GetWarpSizes<DevCpu>
        {
            ALPAKA_FN_HOST static auto getWarpSizes(DevCpu const& /* dev */) -> std::vector<std::size_t>
            {
                return {1u};
            }
        };
 
        //! The CPU device preferred warp size get trait specialization.
        template<>
        struct GetPreferredWarpSize<DevCpu>
        {
            ALPAKA_FN_HOST static constexpr auto getPreferredWarpSize(DevCpu const& /* dev */) -> std::size_t
            {
                return 1u;
            }
        };
 
        //! The CPU device reset trait specialization.
        template<>
        struct Reset<DevCpu>
        {
            ALPAKA_FN_HOST static auto reset(DevCpu const& /* dev */) -> void
            {
                ALPAKA_DEBUG_FULL_LOG_SCOPE;
                // The CPU does nothing on reset.
            }
        };
 
        //! The CPU device native handle type trait specialization.
        template<>
        struct NativeHandle<DevCpu>
        {
            [[nodiscard]] static auto getNativeHandle(DevCpu const& dev)
            {
                return dev.getNativeHandle();
            }
        };
    } // namespace trait
 
    namespace trait
    {
        //! The CPU device platform type trait specialization.
        template<>
        struct PlatformType<DevCpu>
        {
            using type = PlatformCpu;
        };
    } // namespace trait
 
    using QueueCpuNonBlocking = QueueGenericThreadsNonBlocking<DevCpu>;
    using QueueCpuBlocking = QueueGenericThreadsBlocking<DevCpu>;
 
    namespace trait
    {
        template<>
        struct QueueType<DevCpu, Blocking>
        {
            using type = QueueCpuBlocking;
        };
 
        template<>
        struct QueueType<DevCpu, NonBlocking>
        {
            using type = QueueCpuNonBlocking;
        };
    } // namespace trait
} // namespace alpaka