Dynamic Register Allocation for Graphics Threads
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Solution Overview
Problem
Current graphics processing systems face inefficiencies due to a fixed register allocation size for threads, leading to wasted register space when the register demand does not match the allocation size.
Innovation Solution
Implementing multiple register allocation sizes for threads, allowing for dynamic scaling of register resources based on compute and latency demands, thereby optimizing the use of registers across threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed register allocation size is used for threads, then the register allocation is simple and consistent, but register space is wasted when register demand does not match the allocation size
Solution Approach 1:
The patent implements dynamic register allocation by allowing threads to request different numbers of registers based on their actual compute and latency demands. The system transitions from a static fixed allocation model to a dynamic model where allocation size adapts to workload requirements, thereby eliminating wasted register space while maintaining allocation simplicity through automated thread-level configuration.
2Loss of energy
If multiple register allocation sizes are implemented, then register space is optimized based on compute and latency demands, but the system complexity increases
Solution Approach 1:
The patent changes the allocation parameter from a fixed register count to a variable register count that adapts to thread-specific compute and latency demands. By implementing multiple allocation sizes (e.g., 8, 16, 32 registers per thread), the system optimizes register space utilization while managing complexity through predefined allocation tiers that balance performance needs with system simplicity.
3Reliability
If register allocation is increased to match peak demand, then all threads have sufficient registers, but threads with lower demand waste register space
Solution Approach 1:
The patent applies local quality by tailoring register allocation to individual thread characteristics rather than applying a uniform allocation to all threads. Each thread receives the minimum sufficient register allocation based on its specific compute intensity and latency requirements, ensuring that register sufficiency is achieved for each thread without wasting resources on threads that require fewer registers.
Data Source
AI summary
Provision of multiple register allocation sizes for threads is described. An example of a system includes one or more processors including a graphics processor, the graphics processor including at least a first local thread dispatcher (TDL) and multiple processing resources, each processing resource including a plurality of registers; and memory for storage of data for processing, wherein the one or more processors are to determine a register size for a first thread; identify one or more processing resources having sufficient register space for the first thread; select a processing resource of the one or more processing resources having sufficient register space to assign the first thread; select an available thread slot of the selected processing resource for the first thread; and allocate registers of the selected processing resource for the first thread.