Dynamic Cache Sizing and Voltage Management for Power Efficiency
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Solution Overview
Problem
The increasing power consumption of advanced microprocessors in computing devices leads to inefficiencies, such as overheating, energy waste, and reduced battery life, due to processors operating at higher voltages and utilizing larger caches than necessary, especially in applications that do not fully utilize the Last Level Cache (LLC).
Innovation Solution
Implementing dynamic cache sizing and cache operating voltage management, where a Power Control Unit (PCU) monitors the LLC usage and adjusts the cache size and operating voltage based on actual needs, allowing for reduced cache size and voltage when not fully utilized, thereby optimizing power performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processor operates with full cache size and high voltage to maximize processing capability, then processing performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic cache sizing where the cache capacity is adjusted in real-time based on workload requirements. The system monitors cache usage patterns and dynamically scales the cache size, allowing the processor to operate with reduced cache capacity during low-workload periods, thereby reducing power consumption while maintaining adequate performance when needed.
Solution Approach 2:
The system changes operational parameters by adjusting both cache size and operating voltage based on actual workload demands. When the workload is light, the system reduces cache size and lowers voltage; when workload increases, it restores full cache capacity and appropriate voltage levels, optimizing the balance between performance and power consumption.
2Speed
If the processor operates at high voltage to maintain performance, then processing speed is improved, but heat generation increases
Solution Approach 1:
The patent employs dynamic voltage adjustment where the operating voltage is continuously adapted based on actual processing needs. During periods of low utilization, the voltage is reduced, which directly decreases heat generation. When high performance is required, the voltage is restored to maintain processing speed, creating a dynamic balance between speed and thermal output.
3Speed
If the full cache capacity is allocated to the processor, then data access capability is improved, but power consumption increases
Solution Approach 1:
The system implements dynamic cache allocation where the cache capacity assigned to the processor varies based on actual usage patterns. The monitoring mechanism detects when full cache capacity is not needed and dynamically reduces the allocated cache size, thereby reducing the power consumption associated with maintaining large cache structures while preserving data access capability when needed.
4Productivity
If the processor utilizes larger cache to reduce memory access, then processing efficiency is improved, but device complexity increases
Solution Approach 1:
Rather than implementing a static large cache structure, the patent uses dynamic cache sizing to provide large cache capacity only when needed. This approach maintains processing efficiency during high-workload periods while avoiding the complexity and cost of designing and manufacturing processors with permanently large cache structures that would be required for static allocation.
Data Source
AI summary
Embodiments described herein vary an amount of cache available for use by a processor, and an amount of power supplied to the cache and to the processor, based on the amount of cache actually being used by the processor to process data. For example, a power control unit (PCU) may monitor a last level cache (LLC) to identify if the size or amount of the cache being used by a processor to process data and to determine heuristics based on that amount. Based on the monitored amount of cache being used and the heuristics, the PCU causes a corresponding decrease or increase in an amount of the cache available for use by the processor, and a corresponding decrease or increase in an amount of power supplied to the cache and to the processor.