Cache Storage Power Allocation via Usage Hints
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Solution Overview
Problem
Existing cache systems face challenges in efficiently managing resources to reduce power consumption across multiple processing elements, particularly in dynamic workload scenarios, leading to increased complexity and the need for software-driven reconfiguration.
Innovation Solution
Implementing a cache storage system with a power consumption-based allocation policy that uses cache hint information to determine which data to cache, focusing on anticipated usage patterns to minimize memory access power consumption, rather than solely improving processing element performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cache is made relatively large to improve performance for multiple processing elements, then the performance improvement is achieved, but the power consumption and complexity increase
Solution Approach 1:
The cache allocation policy is made dynamic by using cache hint information from access requests to determine which data to cache. The cache control circuitry dynamically adjusts cache content based on usage indications (e.g., read-only, read-write, invalidate) rather than using a fixed allocation policy, allowing the system to adapt to varying workload patterns and reduce power consumption by caching only beneficial data.
2Productivity
If fine-grained management of cache resources is implemented to account for different workload scenarios, then performance optimization is improved, but the complexity of the cache significantly increases
Solution Approach 1:
The complex workload monitoring and policy decision-making functions are extracted from the cache hardware and moved to software. The cache control circuitry only needs to reference simple cache hint information attached to access requests, rather than implementing complex monitoring and decision logic within the cache itself. This extraction of complexity to software maintains performance optimization while keeping hardware complexity manageable.
3Adaptability or versatility
If software monitoring and API reconfiguration are added to dynamically allocate cache resources, then adaptability to different workload scenarios is improved, but the device complexity and ease of operation deteriorate
Solution Approach 1:
The cache system achieves adaptability through self-service mechanisms where cache hint information is automatically attached to access requests by the processing elements or intermediate logic. The cache control circuitry automatically references these hints to make allocation decisions without requiring software to explicitly monitor workloads or invoke APIs for reconfiguration. This self-service approach provides adaptability while minimizing system complexity.
4Use of energy by stationary object
If cache hint information is used to guide cache allocation, then power consumption is reduced, but the complexity of cache control increases
Solution Approach 1:
Cache hint information is prepared in advance and attached to access requests before they reach the cache control circuitry. This preliminary action of pre-tagging requests with usage indications (read-only, read-write, invalidate) allows the cache control logic to make simple reference-based decisions rather than complex analysis, reducing the actual cache control complexity while achieving power consumption benefits.
Data Source
AI summary
The present technique provides an apparatus and method for caching data. The apparatus has a cache storage to cache data associated with memory addresses, a first interface to receive access requests, where each access request is a request to access data at a memory address indicated by that access request, and a second interface to couple to a memory controller used to control access to memory. Further, cache control circuitry is used to control allocation of data into the cache storage in accordance with a power consumption based allocation policy that seeks to select which data is cached in the cache storage with the aim of conserving power associated with accesses to the memory via the second interface. A given access request considered by the cache control circuitry is provided with associated cache hint information providing one or more usage indications for given data at the memory address indicated by that given access request, and the cache control circuitry is arranged to reference the associated cache hint information when applying the power consumption based allocation policy to determine whether to cache the given data in the cache storage.