DVFS Controller Using Instruction Complexity Prediction
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Solution Overview
Problem
As integrated circuits (ICs) become more densely integrated, managing heat generated by them becomes a critical issue affecting performance, and existing dynamic thermal management approaches, such as dynamic voltage and frequency scaling (DVFS), do not effectively adjust voltage-frequency levels based on the complexity of instructions being processed.
Innovation Solution
An integrated circuit with an instruction complexity calculation circuit that predicts instruction complexity based on heating information and generates control signals to adjust voltage-frequency levels, allowing the DVFS controller to dynamically adjust the voltage and frequency in response, optimizing performance and temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dynamic voltage and frequency scaling is performed without considering instruction complexity, then temperature management is simplified, but performance optimization is insufficient
Solution Approach 1:
The instruction complexity calculation circuit calculates the complexity of instructions to be processed in advance before executing them. This preliminary calculation allows the DVFS controller to predict thermal conditions and adjust voltage-frequency levels proactively, rather than reactively after temperature rises, thereby optimizing performance while managing complexity
Solution Approach 2:
The system uses heating information acquired during instruction execution as feedback to calculate instruction complexity for future instructions. This feedback mechanism allows the DVFS controller to continuously adapt voltage-frequency levels based on actual thermal conditions and instruction patterns, achieving both performance optimization and manageable complexity
2Temperature
If voltage-frequency level is adjusted frequently to manage temperature, then temperature management improves, but instruction processing efficiency decreases
Solution Approach 1:
By calculating instruction complexity in advance using historical heating information, the system can predict when temperature thresholds will be reached and adjust voltage-frequency levels beforehand. This prevents excessive temperature rise without requiring frequent adjustments during instruction execution, maintaining processing efficiency
Solution Approach 2:
The system dynamically adjusts voltage-frequency levels based on calculated instruction complexity rather than using fixed thresholds. The DVFS controller adapts the adjustment strategy according to the predicted thermal impact of different instruction types, achieving optimal balance between temperature management and processing efficiency
3Measurement precision
If instruction complexity is calculated based on historical heating information, then prediction accuracy improves, but system complexity increases
Solution Approach 1:
The system stores heating information acquired during previous instruction executions and uses this historical data to calculate the complexity of future instructions. This preliminary storage and calculation approach enables accurate thermal predictions without requiring complex real-time analysis during instruction execution
Solution Approach 2:
The instruction complexity calculation circuit creates a simplified model that copies relevant thermal patterns from historical heating information to predict future instruction complexity. This copying approach extracts essential patterns without replicating the full complexity of the instruction execution environment, achieving accurate predictions with reduced system complexity
Data Source
AI summary
An integrated circuit includes; a core configured to process an instruction in accordance with a voltage-frequency level, an instruction complexity calculation circuit configured to calculate an instruction complexity for at least one instruction to-be-processed after a reference time in relation to heating information related to the core acquired before the reference time, wherein the instruction complexity calculation circuit is further configured to generate a control signal corresponding to the instruction complexity, and a dynamic voltage and frequency scaling (DVFS) controller configured to adjust the voltage-frequency level after the reference time in response to the control signal.