Application-Specific hardware-driven prefetching to improve data cache performance

Authors:
Mehdi Modarressi;Maziar Goudarzi;Shaahin Hessabi
Affiliations:
Computer Engineering Department, Sharif University of Technology, Tehran, Iran;Computer Engineering Department, Sharif University of Technology, Tehran, Iran;Computer Engineering Department, Sharif University of Technology, Tehran, Iran
Venue:
ACSAC'05 Proceedings of the 10th Asia-Pacific conference on Advances in Computer Systems Architecture
Year:
2005

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Abstract

Data cache hit ratio has a major impact on execution performance of programs by effectively reducing average data access time. Prefetching mechanisms improve this ratio by fetching data items that shall soon be required by the running program. Software-driven prefetching enables application-specific policies and potentially provides better results in return for some instruction overhead, whereas hardware-driven prefetching gives little overhead, however general-purpose processors cannot adapt to the specific needs of the running application. In the application-specific processors that we develop customized to an object-oriented application, we implement application-specific hardware prefetching to benefit from both worlds. This prefetching policy prefetches all data items that shall be unconditionally accessed by a class method when the class method is called. We mathematically analyze this mechanism and present its simulation results using some object-oriented benchmarks. Simulation results in absence and presence of the proposed prefetching mechanism confirm the theoretical results and show that on average, the miss ratio is reduced by 73%.