JCSE, vol. 9, no. 1, pp.20-28, January, 2015

DOI: http://dx.doi.org/10.5626/JCSE.2015.9.1.20

Speculative Parallelism Characterization Profiling in General Purpose Computing Applications

Yaobin Wang*, Hong An, Zhiqin Liu, Li Li, Liang Yu, and Yilu Zhen
*Department of Computer Science and Technology, Southwest University of Science and Technology, MianYang, China Department of Computer Science and Technology, University of Science and Technology of China, Hefei, China Department of Computer Science and Technology, Southwest University of Science and Technology, MianYang, China

Abstract: General purpose computing applications have not yet been thoroughly explored in procedure level speculation, especially in the light-weighted profiling way. This paper proposes a light-weighted profiling mechanism to analyze speculative parallelism characterization in several classic general purpose computing applications from SPEC CPU2000 benchmark. By comparing the key performance factors in loop and procedure-level speculation, it includes new findings on the behaviors of loop and procedure-level parallelism under these applications. The experimental results are as follows. The best gzip application can only achieve a 2.4X speedup in loop level speculation, while the best mcf application can achieve almost 3.5X speedup in procedure level. It proves that our light-weighted profiling method is also effective. It is found that between the loop-level and procedure-level TLS, the latter is better on several cases, which is against the conventional perception. It is especially shown in the applications where their

Keyword: Multicore; Thread level speculation; General purpose computing; Profiling; Data dependence

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