Dynamic Storage Heat Maps for Adaptive Prefetching Accuracy
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Solution Overview
Problem
Existing memory systems face challenges in accurately predicting prefetch operations due to static heat maps that fail to adapt to dynamically changing memory access patterns, leading to inefficient data transfer between slower and faster memory tiers.
Innovation Solution
Implement a hardware-based system that generates and updates heat maps in real-time to dynamically adjust prefetching operations, using a serving heat map for immediate prefetching and a training heat map for continuous adaptation based on current traffic patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static heat maps are used for prefetching, then device complexity is reduced, but prefetching accuracy deteriorates due to inability to account for dynamically changing memory access patterns
Solution Approach 1:
The patent implements dynamic heat maps that are continuously updated based on real-time memory access patterns. The heat map data structure is refreshed periodically to reflect current access temperatures, transforming the static heat map approach into a dynamic one that adapts to changing workloads, thereby improving prefetching accuracy without requiring complete system redesign
Solution Approach 2:
The system performs preliminary updates to the heat map by tracking memory access patterns and calculating access temperatures in advance of actual prefetch operations. This preliminary action allows the prefetching mechanism to use up-to-date heat map information, improving accuracy while managing complexity through proactive data preparation
2Measurement precision
If real-time heat map updates are implemented, then prefetching accuracy is improved, but processing time increases due to continuous monitoring and updating operations
Solution Approach 1:
The patent implements periodic updates to the heat map data structure at predetermined intervals rather than continuously updating after every memory access. This periodic action maintains prefetching accuracy by ensuring heat map information is regularly refreshed while significantly reducing the processing overhead compared to continuous real-time updates
Solution Approach 2:
The system updates only the portions of the heat map that are currently relevant to active memory access patterns, rather than performing complete heat map recalculations. This partial action approach maintains accuracy for frequently accessed regions while minimizing unnecessary processing time for less active regions
3Adaptability or versatility
If multiple heat maps are maintained for different time periods, then adaptability to changing access patterns is improved, but device complexity increases due to heat map switching management
Solution Approach 1:
The patent segments the heat map management into distinct components: a current heat map for immediate prefetching operations and a previous heat map for comparison and validation. This segmentation allows the system to maintain multiple heat map states without requiring complex unified management, as each segment serves a specific functional purpose
Solution Approach 2:
The system implements feedback mechanisms where prefetching performance is monitored and used to validate heat map accuracy. When performance metrics indicate the current heat map is providing accurate predictions, the system continues using it; when performance degrades, the system switches to the previous heat map, creating a self-regulating complexity management approach
Data Source
AI summary
A method of prefetching from a storage device connected to a host device, the method including: determining, by the storage device, a first region in a first heat map of the storage device, the first region in the first heat map including an address associated with an instruction received by the storage device from the host device; generating, by the storage device, one or more a prefetch request based on a temperature of the first region of the first heat map, the temperature of the first region of the first heat map corresponding to a number of times the first region of the first heat map is accessed by the host device; prefetching, by the storage device, data or instructions from the first region of the first heat map based on the prefetch request; and updating, a second heat map based on the instruction received from the host device.