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impaginato corretto fullone_Layout 1 13/10/15 12.09 Pagina 71 Department of Engineering, ICT and Technologies for Energy and Transport Patent Title Title Method for the real-time control of working frequencies of large-scale infrastructures with heterogeneous Method for the real time control of working frequencies of large scale infrastructures with heterogeneous hardware requirements. hardware requirements. Ref. CNR 10336 Rif. CNR 10336 Assignee(s): CNR – University of Cagliari CNR Institute: ISSIA Main Inventor: Luca Caviglione Countries: IT, PCT Priority date: 26/06/2014 Abstract Abstract Nowadays, Online Social Networks are more and more complex and serve million of user simultaneously; Nowadays, Online Social Networks are more and more complex and serve million of user simultaneously; for this reason, they require Internet-scale infrastructures, characterized in a homogeneous aggregates for this reason, they require Internet scale infrastructures, characterized in a homogeneous aggregates of machineries. So, the energetic requirement for these systems is often a challenge, both in terms of of machineries. So, the energetic requirement for these systems is often a challenge, both in terms of power efficiency and in terms of different types of consumption (e.g. dissipation of produced heat). The power efficiency and in terms of different types of consumption (e.g. dissipation of produced heat). The object of the present invention permits to: i) define a performance index for the service provided; ii) object of the present invention permits to: i) define a performance index for the service provided; ii) compute “virtual” networking frequencies (that is “technology independent”) at high level ; iii) allow the compute “virtual” networking frequencies (that is “technology independent”) at high level ; iii) allow the real-time dynamic variation of working frequencies in order to reduce energy consumption. real time dynamic variation of working frequencies in order to reduce energy consumption. Background Background To optimize the consumptions of aggregates of machines (e.g., a group of devices or network appliances), To optimize the consumptions of aggregates of machines (e.g., a group of devices or network appliances), we take also advantage of results obtained in the literature dealing with Dynamic Voltage-Frequency we take also advantage of results obtained in the literature dealing with Dynamic Voltage Frequency Scaling (DVFS). However, DVFS does not consider global performance indexes and it could lack of scalability. Scaling (DVFS). However, DVFS does not consider global performance indexes and it could lack of scalability. Technology Technology The system consists of: i) a non-linear controller in charge of computing high-level frequencies in an The system consists of: i) a non linear controller in charge of computing high level frequencies in an efficient manner for homogeneous aggregates of machineries taking into account a performance efficient manner for homogeneous aggregates of machineries taking into account a performance parameter; ii) a set of local mappers (one per worker) to compute per-host frequency assignments in real- parameter; ii) a set of local mappers (one per worker) to compute per host frequency assignments in real time and in a fast and computationally feasible way (i.e., via random optimization methods). time and in a fast and computationally feasible way (i.e., via random optimization methods). Advantages and Applicatons Advantages and Applications Thanks to a 2-level architecture (controller and mappers), the system is “technology-independent”. The Thanks to a 2 level architecture (controller and mappers), the system is “technology independent”. The framework is then used to adjust the frequencies of every devices/machinery in order to not consume framework is then used to adjust the frequencies of every devices/machinery in order to not consume unneeded power. A typical application scenario is the control of physical machines of a cloud infrastructure unneeded power. A typical application scenario is the control of physical machines of a cloud infrastructure or nodes of Internet-scale systems. or nodes of Internet scale systems. Development stage Development stage The method has been implemented via tools for rapid software prototyping and it is proved to effectively The method has been implemented via tools for rapid software prototyping and it is proved to effectively work in many simulated environments. work in many simulated environments. 71