NCNN的内存显存分配器ncnn::Allocator & ncnn::VkAllocator翻译及其差异对比的学习笔记（nihui亲审过滴）

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