MemoryManager.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// The MIT License (MIT)
//
// Copyright (c) 2018 www.open3d.org
//
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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#pragma once

#include <cstring>
#include <memory>
#include <stdexcept>
#include <string>
#include <unordered_map>

#include "open3d/core/Device.h"

namespace open3d {
namespace core {

class DeviceMemoryManager;

class MemoryManager {
public:
    static void* Malloc(size_t byte_size, const Device& device);
    static void Free(void* ptr, const Device& device);
    static void Memcpy(void* dst_ptr,
                       const Device& dst_device,
                       const void* src_ptr,
                       const Device& src_device,
                       size_t num_bytes);
    static void MemcpyFromHost(void* dst_ptr,
                               const Device& dst_device,
                               const void* host_ptr,
                               size_t num_bytes);
    static void MemcpyToHost(void* host_ptr,
                             const void* src_ptr,
                             const Device& src_device,
                             size_t num_bytes);

protected:
    static std::shared_ptr<DeviceMemoryManager> GetDeviceMemoryManager(
            const Device& device);
};

class DeviceMemoryManager {
public:
    virtual void* Malloc(size_t byte_size, const Device& device) = 0;
    virtual void Free(void* ptr, const Device& device) = 0;
    virtual void Memcpy(void* dst_ptr,
                        const Device& dst_device,
                        const void* src_ptr,
                        const Device& src_device,
                        size_t num_bytes) = 0;
    virtual ~DeviceMemoryManager() {}
};

class CPUMemoryManager : public DeviceMemoryManager {
public:
    CPUMemoryManager();
    void* Malloc(size_t byte_size, const Device& device) override;
    void Free(void* ptr, const Device& device) override;
    void Memcpy(void* dst_ptr,
                const Device& dst_device,
                const void* src_ptr,
                const Device& src_device,
                size_t num_bytes) override;
};

#ifdef BUILD_CUDA_MODULE
class CUDASimpleMemoryManager : public DeviceMemoryManager {
public:
    CUDASimpleMemoryManager();
    void* Malloc(size_t byte_size, const Device& device) override;
    void Free(void* ptr, const Device& device) override;
    void Memcpy(void* dst_ptr,
                const Device& dst_device,
                const void* src_ptr,
                const Device& src_device,
                size_t num_bytes) override;

public:
    static void ReleaseCache(){};

protected:
    bool IsCUDAPointer(const void* ptr);
};

class CUDACachedMemoryManager : public DeviceMemoryManager {
public:
    CUDACachedMemoryManager();
    void* Malloc(size_t byte_size, const Device& device) override;
    void Free(void* ptr, const Device& device) override;
    void Memcpy(void* dst_ptr,
                const Device& dst_device,
                const void* src_ptr,
                const Device& src_device,
                size_t num_bytes) override;

public:
    static void ReleaseCache();

protected:
    bool IsCUDAPointer(const void* ptr);
};
#endif

}  // namespace core
}  // namespace open3d