Dynamic Link Scaling for Multi-Processor Power Management
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Solution Overview
Problem
High-performance computing systems face increased power consumption issues due to low link utilization in multi-processor systems, leading to inefficient energy management and heat dissipation challenges.
Innovation Solution
Implementing a system with multiple processors connected via coherence links, where software-controlled power management logic monitors bandwidth utilization and dynamically turns off underutilized links while enabling overutilized links, using trap handlers to manage link scheduling and activation based on utilization thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If link utilization is low in multi-processor systems, then power consumption increases due to inactive links remaining enabled, but if links are dynamically disabled to reduce power consumption, then system complexity increases due to monitoring and control logic
Solution Approach 1:
The system implements self-service through automated monitoring and control logic that dynamically adjusts link states based on utilization metrics. The power management logic autonomously decides when to enable or disable coherence links without manual intervention, allowing the system to adapt to changing workload conditions while minimizing power consumption during low-utilization periods
Solution Approach 2:
The patent applies dynamics by making the link enable/disable state variable rather than fixed. The coherence links transition between enabled and disabled states based on real-time utilization monitoring, allowing the system to optimize power consumption during low-utilization periods while maintaining performance when utilization increases
2Loss of energy
If chip-level power management disables portions of the chip during no utilization, then power consumption is reduced, but then productivity decreases because multiple similar logic structures remain enabled even during low utilization periods
Solution Approach 1:
The patent implements local quality by applying power management selectively to individual coherence links rather than uniformly to the entire chip. Each link's enable/disable state is independently controlled based on its specific utilization metrics, allowing the system to disable only the necessary portions during low utilization while keeping other links active to maintain productivity
3Productivity
If multiple coherence links are maintained enabled for high-performance data transport, then productivity is improved, but then power consumption increases during low utilization periods
Solution Approach 1:
The system dynamically adjusts the number of active coherence links based on real-time utilization monitoring. During high-utilization periods, multiple links remain enabled to maintain high data transport performance. During low-utilization periods, the power management logic disables unnecessary links to reduce power consumption, thus resolving the contradiction between productivity and energy loss
Data Source
AI summary
Systems and methods for reducing power consumption during data transport across multiple processors when link utilization is low. In a multi-node system, at least one of two nodes may indicate low utilization for a given link between them. In response to further determining no enabled link between the two nodes is over utilized, each of the two nodes may remove the given link from consideration for being scheduled to receive data for transfer and turn off the given link when no more transactions are scheduled for the given link. Disabled links may be re-enabled when high utilization is detected on at least one link between the two nodes.