How to use DeviceQueueGlobalPriority?

psionic12 · February 25, 2022, 4:26am

I’m a little confused about how to use VkDeviceQueueGlobalPriorityCreateInfoKHR.
According to the doc,

globalPriority is the system-wide priority associated to this queue as specified by VkQueueGlobalPriorityEXT

I’m a little confused about the word “this”, since VkDeviceQueueGlobalPriorityCreateInfoKHR should be set in VkDeviceQueueCreateInfo, which declare multiple queues, not only one queue.

I guess I shoud set multiple VkDeviceQueueGlobalPriorityCreateInfoKHR in the p_next in VkDeviceQueueCreateInfo for each queue, but the doc said:

pNext must be NULL or a pointer to a valid instance of VkDeviceQueueGlobalPriorityCreateInfoKHR

The doc usually doesn’t express like this if p_next can be chained with multiple VkDeviceQueueGlobalPriorityCreateInfoKHR.

So how should I use VkDeviceQueueGlobalPriorityCreateInfoKHR?

krOoze · February 26, 2022, 11:47am

github.com/KhronosGroup/Vulkan-Docs

Misleading usage of singular "queue" in `VkDeviceQueueGlobalPriorityCreateInfoKHR`

opened 09:38AM - 02 Feb 22 UTC

closed 02:41PM - 17 May 22 UTC

Rua

Resolving Inside Khronos

The documentation of `VkDeviceQueueGlobalPriorityCreateInfoKHR` refers to "queue…" in the singular, which gives the impression that global priorities can be applied on a per-queue granularity. But it is attached to a `VkDeviceQueueCreateInfo` which is responsible for creating `queueCount` queues, and must be unique per combination of queue family and flags. That seems to imply that `VkDeviceQueueGlobalPriorityCreateInfoKHR` applies to all queues created by its parent struct, thus all queues of a given family+flags combination, and not on individual queues.

system · August 28, 2022, 11:48am

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