Dynamic Register Allocation via Spill Count Monitoring
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Solution Overview
Problem
The efficiency of processing cores is declining due to memory latency issues, and there is a need for a more optimal register allocation scheme to improve overall system performance by exposing available resources to dynamic compilers.
Innovation Solution
A computer system with a processor and main memory that includes a plurality of hardware threads, a first register table for architected registers, a second register table, and a mapping table to dynamically adjust the number of architected registers assigned to software threads, with a controller monitoring register usage and notifying threads to recompile for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of architected registers is increased to improve thread execution efficiency, then register allocation optimality improves, but device complexity and resource consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of the number of architected registers based on runtime monitoring of spill counts. The register allocation is not fixed but adapts dynamically to changing workload characteristics, allowing the system to optimize for thread execution efficiency while managing complexity through adaptive rather than static configuration
Solution Approach 2:
The system monitors spill counts as feedback metrics and uses this information to dynamically adjust register allocation. The controller receives feedback about register usage patterns and modifies the number of architected registers accordingly, creating a closed-loop system that balances performance optimization with resource management
2Productivity
If dynamic register allocation is implemented to improve system performance, then thread execution efficiency improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The system performs self-adjustment of register allocation based on monitored spill counts. The controller automatically modifies register allocation without requiring external intervention or complex manual configuration, allowing the system to optimize its own performance while managing the complexity of control mechanisms through autonomous operation
Solution Approach 2:
The patent changes the parameter of architected register count dynamically based on runtime conditions. By adjusting this critical parameter in response to monitored performance metrics, the system achieves performance optimization while the complexity is managed through parameter adaptation rather than structural complexity
3Quantity of substance
If more architected registers are allocated to software threads, then register availability improves, but memory latency issues worsen due to increased register table sizes
Solution Approach 1:
The system dynamically adjusts the number of architected registers based on actual runtime needs rather than allocating a fixed large number. This dynamic approach ensures sufficient register availability when needed while avoiding the memory latency penalties associated with maintaining large register tables for all possible scenarios simultaneously
Data Source
AI summary
A computer system includes a processor, main memory, and controller. The processor includes a plurality of hardware threads configured to execute a plurality of software threads. The main memory includes a first register table configured to contain a current set of architected registers for the currently running software threads. The controller is configured to change a first number of the architected registers assigned to a given one of the software threads to a second number of architected registers when a result of monitoring current usage of the registers by the software threads indicates that the change will improve performance of the computer system. The processor includes a second register table configured to contain a subset of the architected registers and a mapping table for each software thread indicating whether the architected registers referenced by the corresponding software thread are located in the first register table or the second register table.