GPU Duty Cycle Power Control for Performance-Power Tradeoffs
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Solution Overview
Problem
Power management in integrated circuits faces a tradeoff between performance and power conservation, with power gating reducing performance and clock gating not addressing static power consumption effectively.
Innovation Solution
Implementing a power management system that controls the duty cycle of processors, adjusting voltage and frequency based on thermal measurements and actual power consumption to maintain utilization within a desired range, using a negative feedback loop to manage power consumption dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power gating is used to reduce static power consumption, then power consumption is reduced, but performance deteriorates because the power gated circuitry cannot be used until power is restored and the circuitry is initialized
Solution Approach 1:
The patent applies dynamics by making the power management system adaptive and responsive to changing conditions. The system dynamically adjusts power states based on workload detection, transitioning between active and low-power states in real-time based on actual circuit activity rather than static pre-defined states.
Solution Approach 2:
The patent implements feedback mechanisms through workload detection circuits that monitor circuit activity and provide information to the power management logic. This feedback loop enables the system to detect when circuits are idle and automatically transition them to low-power states, and when activity resumes, wake them back to active states, thereby resolving the performance-power tradeoff.
2Use of energy by moving object
If the processor duty cycle is reduced to control power consumption, then power consumption is reduced, but processor availability and perceived performance may deteriorate
Solution Approach 1:
The patent applies periodic action through duty cycle control where the processor operates in alternating active and low-power intervals. The system periodically transitions the processor between states based on workload detection, creating a rhythm of operation that reduces average power consumption while maintaining availability when work is actually present.
Solution Approach 2:
The patent implements self-service through automatic workload detection and self-wake functionality. The circuitry autonomously detects its own idle state and triggers the power reduction, and automatically wakes itself when workload returns, eliminating the need for external control and maintaining system responsiveness without continuous monitoring overhead.
3Use of energy by moving object
If voltage and frequency are lowered to reduce power consumption, then power consumption is reduced, but processing speed and task completion time increase
Solution Approach 1:
The patent applies dynamics by enabling the processor to operate at different voltage and frequency levels adaptively. The system dynamically selects operating points based on actual workload presence, using higher performance settings when work is detected and lower power settings when idle, rather than being locked into a single operating point.
Data Source
AI summary
In one embodiment, a system includes power management control that controls a duty cycle of a processor to manage power. The duty cycle may be the amount of time that the processor is powered on as a percentage of the total time. By frequently powering up and powering down the processor during a period of time, the power consumption of the processor may be controlled while providing the perception that the processor is continuously available. For example, the processor may be a graphics processing unit (GPU), and the period of time over which the duty cycle is managed may be a frame to be displayed on the display screen viewed by a user of the system.