Dynamic Processor Frequency Adjustment for Power Efficiency
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Solution Overview
Problem
Existing power-limited devices face inefficiencies in adjusting processor frequency due to frequent changes in response to external events, leading to unnecessary power loss, as they often raise the frequency to maximum levels even for tasks that do not require high processing speeds.
Innovation Solution
A system that dynamically adjusts the operating frequency based on monitored system performance, determining the desired frequency to balance power efficiency and user experience by prioritizing tasks and using both coarse and fine adjustment mechanisms to optimize processor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the processor frequency is constantly adjusted in response to external events, then the device can respond quickly to processing requests, but power is lost due to frequent frequency changes
Solution Approach 1:
The system performs preliminary monitoring of system performance and task requirements before adjusting frequency. The performance monitor continuously assesses current workload and predicts future processing needs, allowing the system to prepare frequency adjustment decisions in advance rather than reactively changing frequency with every external event.
Solution Approach 2:
The system implements a feedback mechanism where the performance monitor continuously measures actual system performance and task completion status, then feeds this information back to the frequency determination unit. This closed-loop feedback allows the system to optimize frequency settings based on actual performance data rather than merely responding to external events, reducing unnecessary frequency changes.
2Productivity
If the operating frequency is raised to maximum in response to events, then processing speed is maximized, but power consumption increases unnecessarily for tasks that do not require high speed
Solution Approach 1:
The system dynamically changes the operating frequency parameter based on monitored performance metrics and task requirements. Instead of always using maximum frequency, the frequency determination unit adjusts the frequency parameter to match the actual processing needs, using higher frequencies only when tasks require high processing speed and lower frequencies when tasks are less demanding.
Solution Approach 2:
The system applies partial action by using only the necessary processing power required for current tasks rather than always operating at maximum capacity. The frequency determination unit calculates the minimum required frequency to handle current workload, avoiding the excessive power consumption that would result from always using maximum frequency.
3Adaptability or versatility
If the processor frequency is adjusted frequently to handle varying workloads, then the device can adapt to different processing demands, but the efficiency decreases due to the power loss associated with each frequency change
Solution Approach 1:
The performance monitor continuously monitors system performance and feeds this information back to the frequency determination unit, enabling the system to adapt processing capability based on actual workload conditions. This feedback mechanism allows the system to make informed frequency adjustment decisions only when necessary, rather than frequently adjusting in response to every minor workload variation.
Solution Approach 2:
The system performs preliminary assessment of workload requirements and performance conditions before making frequency adjustments. By monitoring system performance in advance and predicting future processing needs, the system can plan frequency changes more strategically, reducing the total number of adjustments needed while maintaining adaptability to varying demands.
Data Source
AI summary
A method for altering an operating frequency of a processor. The method includes monitoring a real-time performance indicator of a system, and determining a desired frequency in response to the indicator. The indicator may be an amount of idle time of a processor of the system. The method also includes selectively altering an operating frequency of the processor in response to a comparison of the desired frequency and the operating frequency, including increasing the operating frequency in response to the desired frequency being greater than the operating frequency, and decreasing the operating frequency only in response to the desired frequency being less than the operating frequency by more than a predetermined value.