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Improving single-thread fetch performance on a multithreaded processor

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4 Author(s)
Moure, J.C. ; Comput. Archit. & Operating Syst. Group, Univ. Autonoma de Barcelona, Spain ; Garcia, R.B. ; Rexachs, D.I. ; Luque, E.

Multithreaded processors, by simultaneously using both the thread-level parallelism and the instruction-level parallelism of applications, achieve larger instruction per cycle rate than single-thread processors. On a multi-thread workload, a clustered organization maximizes performances. On a single-thread workload, however, all but one of the clusters are idle, degrading single-thread performance significantly. Using a clustered multi-thread performance as a baseline, we propose and analyze several mechanisms and policies to improve single-thread execution exploiting the existing hardware without a significant multi-thread performance loss. We focus on the fetch unit, which is maybe the most performance-critical stage. Essentially, we analyze three ways of exploiting the idle fetch clusters: allowing a single thread accessing its neighbor clusters, use the idle fetch clusters to provide multiple-path execution, or use them to widen the effective single-three fetch block

Published in:

Digital Systems Design, 2001. Proceedings. Euromicro Symposium on

Date of Conference:

2001