Package org.lwjgl.vulkan

Class EXTGlobalPriority

java.lang.Object
org.lwjgl.vulkan.EXTGlobalPriority
public final class EXTGlobalPriority extends Object
In Vulkan, users can specify device-scope queue priorities. In some cases it may be useful to extend this concept to a system-wide scope. This extension provides a mechanism for callers to set their system-wide priority. The default queue priority is QUEUE_GLOBAL_PRIORITY_MEDIUM_EXT.

The driver implementation will attempt to skew hardware resource allocation in favour of the higher-priority task. Therefore, higher-priority work may retain similar latency and throughput characteristics even if the system is congested with lower priority work.

The global priority level of a queue shall take precedence over the per-process queue priority (VkDeviceQueueCreateInfo::pQueuePriorities).

Abuse of this feature may result in starving the rest of the system from hardware resources. Therefore, the driver implementation may deny requests to acquire a priority above the default priority (QUEUE_GLOBAL_PRIORITY_MEDIUM_EXT) if the caller does not have sufficient privileges. In this scenario ERROR_NOT_PERMITTED_EXT is returned.

The driver implementation may fail the queue allocation request if resources required to complete the operation have been exhausted (either by the same process or a different process). In this scenario ERROR_INITIALIZATION_FAILED is returned.

VK_EXT_global_priority
Name String
VK_EXT_global_priority
Extension Type
Device extension
Registered Extension Number
175
Revision
2
Deprecation State
Contact
Other Extension Metadata
Last Modified Date
2017-10-06
IP Status
No known IP claims.
Contributors
  • Andres Rodriguez, Valve
  • Pierre-Loup Griffais, Valve
  • Dan Ginsburg, Valve
  • Mitch Singer, AMD