Cache Prefetching for Non-Sequential Access Patterns

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Solution Overview

Problem

Existing cache prefetching technologies are ineffective in handling non-sequential access patterns, failing to capitalize on frequently repeated sequences of events that could improve cache efficiency.

Innovation Solution

A method for cache prefetching that identifies frequently accessed non-sequential cache records, collects trailing record statistics, and applies a caching strategy to prefetch associated records, thereby enhancing cache hits and overall system performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If sequential prefetching is used, then cache hits for sequential access patterns are improved, but non-sequential access patterns cannot be optimized

Engineering Contradiction:

Improvecache hit rateVSAvoidhandling of access patterns

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent implements a dynamic prefetching system that adapts to different access patterns by monitoring cache access behavior and adjusting prefetching strategies in real-time. The system transitions from static sequential prefetching to dynamic pattern recognition, enabling it to handle both sequential and non-sequential access patterns effectively.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of prefetching behavior based on detected access patterns. When non-sequential patterns are identified, the prefetching mechanism adjusts its parameters to prefetch based on observed access sequences rather than fixed sequential offsets, thereby optimizing cache hits for varying access patterns.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If simple caching strategies are used, then implementation complexity is reduced, but cache efficiency for non-sequential patterns deteriorates

Engineering Contradiction:

Improvecaching strategy complexityVSAvoidcache efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent incorporates feedback mechanisms that monitor cache access patterns and use this information to refine prefetching strategies. The system continuously observes access behavior, identifies non-sequential patterns, and adjusts prefetching decisions based on this feedback, thereby improving cache efficiency without requiring complex manual configuration.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The caching system performs self-optimization by automatically detecting access patterns and adjusting its own prefetching behavior. The system serves itself by monitoring its performance and making autonomous decisions to improve cache efficiency, reducing the need for external intervention or complex manual management.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9021210B2Cache prefetching based on non-sequential lagging cache affinity

Publication Date: 2015.04.28 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A mechanism is provided in a cache subsystem for cache prefetching based on non-sequential access. The mechanism determines frequently accessed non-sequential cache records in the cache subsystem. The mechanism collects trailing record statistics for the frequently accessed non-sequential cache records. The mechanism determines a caching strategy. The caching strategy comprises prefetching a set of trailing records responsive to a read of a given frequently accessed non-sequential cache record. The mechanism applies the caching strategy to the cache subsystem.