Pre-Grant Publication Number: 20080104325
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Prior Art Detail
Summary / Description
| Summary / Description | Prefetches to a cache memory subsystem are made from predictions which are based on access patterns stored by context. An access pattern is generated from prior accesses of a data processing system processing in a like context. During a training sequence, an actual trace of memory accesses is processed to generate unit patterns which serve in making future predictions and to identify statistics such as pattern accuracy for each unit pattern. |
Basic Information
| Type of Prior Art | Issued Patents - US |
| Country | United States of America |
| Patent/Application # | 5305389 |
| Kind Code | United States (US) - United STATES Patent - A |
| Patentee Name | Digital Equipment Corporation |
| Relevant Pages, Columns, or Lines | |
| URL | |
| Filing Date | August 30, 1991 |
| Additional Information | |
Notes / To Do
| Notes | Entering this prior art on behalf of John-David Wellman. |
Excerpt
Excerpt Data processing system with predictive cache memory sub-system - has prefetcher responsive to current access pattern during operation of system for predicting accesses to objects and prefetching predicted objects in cache memory.
Predictive caching is a method of increasing the performance of applications that retrieve data from a slower secondary store and cache it in fast memory during a session. The predictive cache recognizes and learns access pattern regularities that appear over time within a usage context, exploiting these regularities to anticipate movement of data across memory boundaries, particularly I/O boundaries.
a data processing system includes a predictive cache memory subsystem which allows objects accessed from secondary memory to be stored in cache memory. The subsystem includes a pattern memory for storing patterns of access to data objects. The stored patterns are generated by analysis of prior object accesses when the data processing system is processing in a like context. A prefetcher includes a predictor which responds to a current access pattern during operation of the data processing system to predict, from like object access patterns stored in pattern memory, accesses to objects. The predicted objects are prefetched and stored in cache memory. |
Relevance
Claims
1
Relevance
Abstract: Prefetches to a cache memory subsystem are made from predictions which are based on access patterns stored by context. An access pattern is generated from prior accesses of a data processing system processing in a like context.
Predictive caching is disclosed which is the 'monitor agent' in the patent application.
Abstract: Prefetches to a cache memory subsystem are made from predictions which are based on access patterns stored by context. An access pattern is generated from prior accesses of a data processing system processing in a like context.
Predictive caching is disclosed which is the 'monitor agent' in the patent application.
Claim Chart
All
13
Relevance
Abstract: Prefetches to a cache memory subsystem are made from predictions which are based on access patterns stored by context. An access pattern is generated from prior accesses of a data processing system processing in a like context.
Predictive caching is disclosed which is the 'monitor agent' in the patent application.
Abstract: Prefetches to a cache memory subsystem are made from predictions which are based on access patterns stored by context. An access pattern is generated from prior accesses of a data processing system processing in a like context.
Predictive caching is disclosed which is the 'monitor agent' in the patent application.
Claim Chart
All
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