VkMemoryPropertyFlagBits - Bitmask specifying properties for a memory type

Description

• MEMORY_PROPERTY_DEVICE_LOCAL_BIT bit specifies that memory allocated with this type is the most efficient for device access. This property will be set if and only if the memory type belongs to a heap with the MEMORY_HEAP_DEVICE_LOCAL_BIT set.

• MEMORY_PROPERTY_HOST_VISIBLE_BIT bit specifies that memory allocated with this type can be mapped for host access using mapMemory.
• MEMORY_PROPERTY_HOST_COHERENT_BIT bit specifies that the host cache management commands flushMappedMemoryRanges and invalidateMappedMemoryRanges are not needed to manage availability and visibility on the host.
• MEMORY_PROPERTY_HOST_CACHED_BIT bit specifies that memory allocated with this type is cached on the host. Host memory accesses to uncached memory are slower than to cached memory, however uncached memory is always host coherent.
• MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT bit specifies that the memory type only allows device access to the memory. Memory types must not have both MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT and MEMORY_PROPERTY_HOST_VISIBLE_BIT set. Additionally, the object’s backing memory may be provided by the implementation lazily as specified in Lazily Allocated Memory.
• MEMORY_PROPERTY_PROTECTED_BIT bit specifies that the memory type only allows device access to the memory, and allows protected queue operations to access the memory. Memory types must not have MEMORY_PROPERTY_PROTECTED_BIT set and any of MEMORY_PROPERTY_HOST_VISIBLE_BIT set, or MEMORY_PROPERTY_HOST_COHERENT_BIT set, or MEMORY_PROPERTY_HOST_CACHED_BIT set.
• MEMORY_PROPERTY_DEVICE_COHERENT_BIT_AMD bit specifies that device accesses to allocations of this memory type are automatically made available and visible on the device. If paired with MEMORY_PROPERTY_HOST_COHERENT_BIT, memory domain operations are also performed automatically between host and device.
• MEMORY_PROPERTY_DEVICE_UNCACHED_BIT_AMD bit specifies that memory allocated with this type is not cached on the device. Uncached device memory is always device coherent.
• MEMORY_PROPERTY_RDMA_CAPABLE_BIT_NV bit specifies that external devices can access this memory directly.

For any memory allocated with both the MEMORY_PROPERTY_HOST_COHERENT_BIT and the MEMORY_PROPERTY_DEVICE_COHERENT_BIT_AMD, host or device accesses also perform automatic memory domain transfer operations, such that writes are always automatically available and visible to both host and device memory domains.

Device coherence is a useful property for certain debugging use cases (e.g. crash analysis, where performing separate coherence actions could mean values are not reported correctly). However, device coherent accesses may be slower than equivalent accesses without device coherence, particularly if they are also device uncached. For device uncached memory in particular, repeated accesses to the same or neighboring memory locations over a short time period (e.g. within a frame) may be slower than it would be for the equivalent cached memory type. As such, it is generally inadvisable to use device coherent or device uncached memory except when really needed.

See Also

VK_VERSION_1_0, MemoryPropertyFlags