Loop Cache with Persistence Counter for Memory Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high cost of fast memory leads to cache memory being provided in smaller amounts than main memory, necessitating a solution to optimize memory access efficiency without increasing power consumption.
Innovation Solution
A loop cache apparatus and method that includes a processor and a loop cache with a persistence counter, allowing for efficient storage and retrieval of instructions corresponding to loops, reducing the need for accessing larger and slower memory tiers by using a small buffer that consumes less power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cache memory is provided in smaller amounts to reduce cost, then memory cost is reduced, but memory access efficiency deteriorates
Solution Approach 1:
The invention segments the cache memory into multiple sets, where each set contains multiple ways. This segmentation allows the system to store different loop iterations in different sets, improving memory access efficiency without requiring a large increase in total cache size. The segmented structure enables better utilization of the limited cache space by organizing data access patterns more efficiently.
Solution Approach 2:
The invention implements a hierarchical memory structure where the loop cache is nested within the broader cache memory system. The loop cache specifically targets and caches loop-related data structures, while the larger cache memory provides general-purpose caching. This nesting allows the system to optimize for specific access patterns (loops) without requiring the entire cache system to be large, thus maintaining cost efficiency while improving productivity.
2Speed
If faster memory is used to improve processing speed, then processing speed is improved, but power consumption increases
Solution Approach 1:
The invention applies local quality by creating a specialized loop cache with specific characteristics optimized for loop data structures. Rather than making the entire cache system faster and more power-consuming, only the loop cache portion is optimized with faster access times. This localized optimization improves processing speed for loop operations while keeping the overall power consumption lower than a fully upgraded cache system would require.
3Use of energy by moving object
If a small buffer is used to reduce power consumption, then power efficiency is improved, but memory access efficiency deteriorates
Solution Approach 1:
The invention introduces dynamic replacement policies that adapt to the specific access patterns of loop data structures. The loop cache dynamically determines which loop iterations to retain and which to replace based on usage patterns, allowing a small buffer to achieve higher effective capacity. This dynamic behavior enables the small buffer to maintain power efficiency while improving memory access efficiency for loop operations compared to static caching approaches.
Solution Approach 2:
The invention changes the organizational parameters of the cache, specifically designing the loop cache with a focus on storing loop iteration data structures rather than general-purpose data. By changing what type of data is prioritized for caching and how it is organized within the buffer, the system achieves improved memory access efficiency for loop operations without increasing buffer size or power consumption.
Data Source
AI summary
An apparatus includes a processor and a loop cache coupled to the processor. The loop cache provides to the processor instructions corresponding to a loop in the instructions. The loop cache includes a persistence counter.