The Architecture of Kaligreen V2: A Middleware Aware of Hardware Opportunities to Save Energy

Nowadays, energy saving in the use of information technologies is a very important issue both from the economic and sustainability point of view. Many scientists investigate methods to save energy at different application levels (cloud: i.e., architectures, grid: i.e., middlewares and frameworks and hardware management: i.e., operating systems) and many of them agree on the strategy of executing programs, processes or virtual machines only using the time and resources that are strictly necessary. For this, it is necessary to plan strategies for deployment and relocation of processes; but always taking into account hardware repercussions and the knowledge of the architecture and applications behavior. On the other hand, it has already been demonstrated that the use of microservices brings numerous advantages in availability and efficiency; but we do not find many jobs that exploit this technique on the energy level. In this article, we present the architecture of a middleware for distributed microservices-based applications, which allows any negotiation-based scheduling algorithm to duplicate or move microservices from one device to another in a non-centralized way for energy savings, taking into account the consumption characteristics of the microservices and the capabilities that the hardware components offer.