What to adapt in a high-performance microprocessor
SourceProceedings of the EUROMICRO Systems on Digital System Design, DSD 2004
Proceedings of the EUROMICRO Systems on Digital System Design, DSD 2004
Google Scholar check
MetadataShow full item record
High-performance processors usually require large amounts of power for their operation. Adapting resources in such processors is very relevant as each application and distinct use of the system has a different demand. A frequent use of adaptation is to have the processor operating in either high-performance or low-power mode. In this work we analyze how power and performance change while modifying most of the resources in a processor. This leads to identifying which resources are more important for adaptation. This analysis was performed for three distinct workloads: multimedia, scientific, and database. Four criteria were defined to limit the adaptation range considering the cost and/or the efficiency of the system. The results of our experiments showed that the resource to be adapted depends on the: (1) operating mode (e.g. low-power or high-performance), (2) the workload, and (3) the criteria. Overall, for our baseline processor configuration, the dominant resources to be adapted are the voltage-frequency and the first-level instruction cache. Adapting resources may lead to an increase in the performance by up to 44% or a reduction in power by up to 93% with no restrictions. For configurations of the same cost and efficiency as the baseline, adaptation of resources may improve the performance by 33% or reduce the power by 34%.