An object-based processor cache.

Russell, Gordon; Shaw, Paul

Abstract

In the past, many persistent object-oriented architecture designs have been based on traditional processor technologies. Such architectures invariantly attempt to insert an object-level abstraction mechanism over the traditional processorÕs virtual addressing scheme; this results in an architecture which incurs a translation overhead on every object access. Other architectures use objects at the instruction level, but then use a virtual -based caching scheme. This may require bounds-checking, and even object-to-virtual translation, to be performed on every object access. A new architecture, DAIS, is proposed which utilizes objects in instructions and in the caches. This paper presents a short history of persistence, analyses a number of persistent architectures, and presents the DAIS design strategy. The object-based caching mechanism of DAIS is described, involving topics such as object protection via tag bits, object- and page-based locking, range checking, object to virtual mapping function, and use of a secondary descriptor cache. The cache design results in a processor which is no slower than conventional processors based on virtual memory. The design is then extensively analysed for performance with differing cache sizes. This analysis indicates that using a secondary descriptor cache can increase performance by 21% over a system with instruction and data caches alone.

Citation

Russell, G., & Shaw, P. (1993). An object-based processor cache

• Report Type: Technical Report
• Publication Date: 1993
• Deposit Date: Aug 27, 2010
• Publicly Available Date: Aug 27, 2010
• Peer Reviewed: Not Peer Reviewed
• Keywords: persistent object-oriented architecture; virtual addressing scheme; virtual -based caching scheme; DAIS
• Public URL: http://researchrepository.napier.ac.uk/id/eprint/3187
• Contract Date: Aug 27, 2010