GPU Texture Wave Allocation Under GPR and Wave Slot Limits
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Solution Overview
Problem
The constraint of limited memory, registers, and wave slots in graphics processing units (GPUs) hinders efficient texture mapping and general-purpose computing, leading to increased latency and costs when additional memory is used to mitigate latency.
Innovation Solution
Efficient allocation of general purpose registers (GPR) and physical wave slots by deferring their use for texture operations, utilizing virtual wave slots and texture buffers to optimize resource utilization, allowing continuous processing without initial allocation, and converting to physical slots when available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If additional memory is used to mitigate latency in texture mapping, then latency is reduced, but device cost increases
Solution Approach 1:
The system performs preliminary actions by pre-allocating virtual wave slots and deferring physical wave slot allocation until needed. This allows the GPU to prepare for future texture mapping operations without immediately consuming additional physical memory resources, thereby reducing latency through better resource management rather than simply adding more memory
Solution Approach 2:
Virtual wave slots act as an intermediary between the need for wave slot allocation and the physical wave slots available in hardware. This intermediary layer allows the system to manage wave slots more efficiently, deferring physical allocation until necessary and reducing the need for expensive additional memory to handle latency issues
2Productivity
If more wave slots are allocated for texture operations, then throughput is improved, but device complexity increases
Solution Approach 1:
The system segments wave slot allocation into virtual and physical layers. Virtual wave slots can be allocated freely to represent different texture mapping operations, while physical wave slots are allocated only when needed based on actual hardware availability. This segmentation allows the system to improve throughput by managing more wave slots virtually while keeping physical device complexity manageable
Solution Approach 2:
The wave slot allocation system is made dynamic through deferred allocation and conversion mechanisms. The system can adaptively convert virtual wave slots to physical wave slots based on real-time availability and needs, allowing throughput to be optimized without fixed physical allocation constraints that would increase device complexity
3Ease of operation
If general purpose registers are allocated upfront, then resource availability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The system performs preliminary allocation of virtual wave slots and register resources, but defers the actual consumption of physical resources until needed. This allows the system to guarantee resource availability for upcoming operations while improving utilization efficiency by avoiding premature allocation of physical GPRs and wave slots that would reduce the pool of available resources for other operations
Data Source
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AI summary
Example techniques are described for generating graphics content by obtaining texture operation instructions corresponding to a texture operation, in response to determining at least one of insufficient general purpose register space is available for the texture operation or insufficient wave slots are available for the texture operation, generating an indication that the texture operation corresponds to a deferred wave, executing the texture operation, sending, to a texture processor, initial texture sample instructions corresponding to the texture operation that was executed, and receiving texture mapped data corresponding to the initial texture sample instructions.