Cache invalidation

About: Cache invalidation is a research topic. Over the lifetime, 10539 publications have been published within this topic receiving 245409 citations.

Proactive power-aware cache management for mobile computing systems

Abstract: Recent work has shown that invalidation report (IR)-based cache management is an attractive approach for mobile environments. However, the IR-based cache invalidation solution has some limitations, such as long query delay, low bandwidth utilization, and it is not suitable for applications where data change frequently. In this paper, we propose a proactive cache management scheme to address these issues. Instead of passively waiting, the clients intelligently prefetch the data that are most likely used in the future. Based on a novel prefetch-access ratio concept, the proposed scheme can dynamically optimize performance or power based on the available resources and the performance requirements. To deal with frequently updated data, different techniques (indexing and caching) are applied to handle different components of the data based on their update frequency. Detailed simulation experiments are carried out to evaluate the proposed methodology. Compared to previous schemes, our solution not only improves the cache hit ratio, the throughput, and the bandwidth utilization, but also reduces the query delay and the power consumption.

Hardware acceleration of boot-up utilizing a non-volatile disk cache

Abstract: A computer system includes a nonvolatile memory positioned between a disk controller and a disk drive storing a boot program, in a computer system. Upon an initial boot sequence, the boot program is loaded into a cache in the nonvolatile memory. Subsequent boot sequences retrieve the boot program from the cache. Cache validity is maintained by monitoring cache misses, and/or by monitoring writes to the disk such that a write to a sector held in the cache results in the cache line for that sector being invalidated until such time as the cache is updated. A filter driver is provided to monitor writes to the disk and determine if a cache line is invalidated.

Cache control method and system for mixed streaming and non-streaming data

Abstract: The present invention may be embodied in a cache control method for caching disk data in a disk drive configured to receive commands for both streaming and non-streaming data from a host. A lossy state record is provided for memory segments in a cache memory. The lossy state record allows hosts commands to be mixed for streaming and non-streaming data without flushing of cache data for a command mode change.

Method for managing a cache hierarchy having a least recently used (LRU) global cache and a plurality of LRU destaging local caches containing counterpart datatype partitions

Abstract: A method for managing a cache hierarchy having a fixed total storage capacity is disclosed. The cache hierarchy is logically partitioned to form a least recently used (LRU) global cache and a plurality of LRU destaging local caches. The global cache stores objects of all types and maintains them in LRU order. In contrast, each local cache is bound to objects having a unique data type T(i), where i is indicative of a DataType. Read and write accesses by referencing processors or central processing units (CPU's) are made to the global cache. Data not available in the global cache is staged thereto either from one of the local caches or from external storage. When a cache full condition is reached, placement of the most recently used (MRU) data element to the top of the global cache results in an LRU data element of type T(i) being destaged from the global cache to a corresponding one of the local caches storing type T(i) data. Likewise, when a cache full condition is reached in any one or more of the local caches, the local caches in turn will destage their LRU data elements to external storage. The parameters defining the partitions are externally supplied.

Systems and Methods for Cache Optimization

Abstract: A server computer identifies a cached document and its associated cache update history in response to a request or in anticipation of a request from a client computer. The server computer analyzes the document's cache update history to determine if the cached document is de facto fresh. If the cached document is de facto fresh, the server computer then transmits the cached document to the client computer. Independently, the server computer also fetches an instance of the document from another source like a web host and updates the document's cache update history using the fetched instance of the document.