Abstract
In Simultaneous Multithreading (SMT) processors, the instruction fetch policy implicitly determines shared resources allocation among all the co-scheduled threads, and consequently affects throughput and fairness. However, prior work on fetch policies almost focuses on throughput optimization. The issue of fairness between threads in progress rates is studied rarely.
In this paper, we take fairness as the optimization goal and propose an enhanced version of ICOUNT2.8 with better fairness called ICOUNT2.8-fairness. Results show that using ICOUNT2.8-fairness, RPRrange (a fairness metric defined in this paper) is less than 5% for all types of workloads, and the degradation of overall throughput is not more than 7%. Especially, for two-thread MIX workload, ICOUNT2.8-fairness outperforms ICOUNT2.8 in throughput at the same time of achieving better fairness.
This work was supported by Chinese NSF under the grant No.60376018.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Tullsen, D., Eggers, S., Levy, H.: Simultaneous multithreading: Maximizing on-chip parallelism. In: Proc. ISCA-22 (1995)
Tullsen, D., Eggers, S., Emer, J., Levy, H., Lo, J., Stamm, R.: Exploiting choice: Instruction fetch and issue on an implementable simultaneous multithreading processor. In: Proc. ISCA-23 (1996)
Kim, S., Chandra, D., Solihin, Y.: Fair cache sharing and partitioning in a chip multiprocessor architecture. In: Proc. PACT-13 (2004)
Tullsen, D., Brown, J.: Handling long-latency loads in a simultaneous multithreaded processor. In: Proc. MICRO-34 (2001)
El-Moursy, A., Albonesi, D.: Front-end policies for improved issue efficiency in SMT processors. In: Proc. HPCA-9 (2003)
Snavely, A., Tullsen, D.: Symbiotic jobscheduling for a simultaneous multithreading architecture. In: Proc. ASPLOS-9 (2000)
Tullsen, D.: Simulation and modeling of a simultaneous multithreading processor. In: Proceedings of 22nd Annual Computer Measurement Group Conference (1996)
The standard performance evaluation corporation. WWW site, http://www.specbench.org
Sherwood, T., Perelman, E., Calder, B.: Basic block distribution analysis to find periodic behavior and simulation points in applications. In: Proc. of PACT-10 (2001)
Sherwood, T., Calder, B.: Time varying behavior of programs. Tech. Report UCSDCS99 -630, Univ. of Calif. (1999)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2006 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Sun, C., Tang, H., Zhang, M. (2006). Enhancing ICOUNT2.8 Fetch Policy with Better Fairness for SMT Processors. In: Jesshope, C., Egan, C. (eds) Advances in Computer Systems Architecture. ACSAC 2006. Lecture Notes in Computer Science, vol 4186. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11859802_44
Download citation
DOI: https://doi.org/10.1007/11859802_44
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-40056-1
Online ISBN: 978-3-540-40058-5
eBook Packages: Computer ScienceComputer Science (R0)