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Overlay Multicast Optimization : IBM ILOG CPLEX

Kucharzak M., Zydek D., Poźniak-Koszałka I.

International Journal of Electronics and Telecommunications

2012

Vol. 58, No. 4

381-388

IBM ILOG CPLEX Optimization Studio delivers advanced and complex optimization libraries that solve linear programming (LP) and related problems, e.g., mixed integer. Moreover, the optimization tool provides users with its Academic Research Edition, which is available for teaching and noncommercial research at no-charge. This paper describes the usage of CPLEX C++ API for solving linear problems and, as an exhaustive example, optimization of network flows in overlay multicast is taken into account. Applying continuous and integral variables and implementing various constraints, including equations and inequalities, as well as setting some global parameters of the solver are presented and widely explained.

Evaluation Scheme for NoC-based CMP with Integrated Processor Management System

Zydek D., Selvaray H., Koszałka L., Poźniak-Koszałka I.

International Journal of Electronics and Telecommunications

2010

Vol. 56, No. 2

157-167

With the opportunities and benefits offered by Chip Multiprocessors (CMPs), there are many challenges that need to be addressed in order to exploit the full potential of CMPs. Such aspects as parallel programs, interconnection design, cache arrangement and on-chip cores allocation become a limiting factor. To ensure validity of approaches and research, we propose an evaluation system for CMPs with Network-on-Chip (NoC) and processor management system integrated on one die. The suggested experimentation system is described in details. The proposed system that is used for tests and results of the experiments are presented and discussed. As decision making criteria, we consider energy efficiency of Processor Allocator (PA) and NoC, as well as NoC traffic characteristic (load balance). In order to improve the system understanding, brief overview on most important NoC and PA architectures is also presented. Analyzed results reveal that CMP with a PA controlled by IFF allocation algorithm for mesh systems and torus-based NoC driven by DORLB routing with express-virtual-channel flow control achieved the best traffic balance and energy characteristic.