NCNN是一个轻量级的深度学习框架，它提供了自己的内存管理类`ncnn::Allocator`，用于在CPU和GPU上分配和释放内存。以下是一个简单的示例，展示了如何使用`ncnn::Allocator`进行内存的显存分配。```cpp#include n

NCNN的内存分配器 ncnn::Allocator 通用内存分配器 ncnn::PoolAllocator 内存池分配器 可以设置池大小，减少分配内存和析构内存次数，空间换时间 ncnn::UnlockedPoolAllocator 无锁内存池分配器 同上，只是需在外部保证不会同时访问内存资源 NCNN的显存分配器 ncnn::VkAllocator 通用显存分配器（基类） ncnn::VkBlobAllocator 特征显存分配器 vkCreateBuffer(): VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT 集成显卡: required: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT preferred: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT preferred_not: 0 独立显卡: required: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT preferred: 0 preferred_not: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT ncnn::VkWeightAllocator 权重显存分配器 vkCreateBuffer(): VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT vkAllocateMemory(): 集成显卡: required: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT preferred: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT preferred_not: 0 独立显卡: required: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT preferred: 0 preferred_not: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT ncnn::VkStagingAllocator 临时缓冲区显存分配器 vkCreateBuffer(): VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT vkAllocateMemory(): required: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT preferred: VK_MEMORY_PROPERTY_HOST_CACHED_BIT preferred_not: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT ncnn::VkWeightStagingAllocator 权重+临时缓冲区显存分配器 vkCreateBuffer(): VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT vkAllocateMemory(): required: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT preferred: VK_MEMORY_PROPERTY_HOST_CACHED_BIT preferred_not: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT ncnn::VkAndroidHardwareBufferImageAllocator 专门为Android优化显存分配器