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TCP: Thread Contention Predictor for Parallel Programs

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4 Author(s)
Dani, A.M. ; Indian Inst. of Sci., Bangalore, India ; Amrutur, B. ; Srikant, Y.N. ; Bhattacharyya, C.

With proliferation of chip multicores (CMPs) on desktops and embedded platforms, multi-threaded programs have become ubiquitous. Existence of multiple threads may cause resource contention, such as, in on-chip shared cache and interconnects, depending upon how they access resources. Hence, we propose a tool - Thread Contention Predictor (TCP) to help quantify the number of threads sharing data and their sharing pattern. We demonstrate its use to predict a more profitable shared, last level on-chip cache (LLC) access policy on CMPs. Our cache configuration predictor is 2.2 times faster compared to the cycle-accurate simulations. We also demonstrate its use for identifying hot data structures in a program which may cause performance degradation due to false data sharing. We fix layout of such data structures and show up-to 10% and 18% improvement in execution time and energy-delay product (EDP), respectively.

Published in:

Parallel, Distributed and Network-Based Processing (PDP), 2012 20th Euromicro International Conference on

Date of Conference:

15-17 Feb. 2012