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The electric power consumed by servers has to be reduced in a cluster in order to realize eco society. We take a macro level approach to reducing the total electric energy consumption of servers to perform application processes in a server cluster. Servers are now equipped with multi-core CPUs. In this paper, we discuss a multi-level power consumption(More)
Application processes have to be efficiently performed on servers in a cluster with respect to not only performance but also energy consumption. In this paper, we consider a process migration (MG) approach to energy-efficiently performing an application process on servers in a cluster. In this paper, we propose a model to estimate the energy consumption of(More)
In peer-to-peer (P2P) overlay networks, a group of n (≥ 2) peer processes have to cooperate with each other. P2P systems are in nature scalable and distributed, where there is no centralized coordinator. Each peer sends messages to every peer and receives messages from every peer in a group. In group communications, each message sent by a peer is(More)
It is critical to reduce the electric power consumed by servers in a cluster in order to realize eco society. In the multi-level power consumption (MLPC) model of a server with a multi-core CPU, the power consumption of the server depends on the number of active cores and active threads where at least one application process is performed. In our previous(More)
Electric power consumed by servers has to be reduced in order to realize green societies. We consider computation (CP) and storage (ST) types of application processes performed on servers in this paper, where CPU and storage drives are mainly used, respectively. In the storage- and computation-based power consumption model proposed by the authors, the power(More)
It is critical to reduce the electric power consumed by servers in a cluster in order to realize eco society. In our previous studies, the multi-level power consumption (MLPC) model of a server with a multi-thread CPU, the power consumption of the server is proposed and the globally energy-aware (GEA) algorithm is discussed to select a server for each(More)
It is now critical to reduce electric energy consumed in a cluster of servers, especially scalable systems like cloud computing systems. In clusters, most application processes like web applications use not only CPU resources but also files and databases. In this paper, we consider storage processes which read and write data in files in addition to(More)
Application processes have to be efficiently and reliably performed on servers in a cluster. A process is replicated to increase the reliability and availability. However, the more number of replicas of a process are performed, the more reliable and available the system is but the more amount of electric energy is consumed. In this paper, we take a process(More)
In information systems, data in an object may illegally flow into another object if a subject manipulates the objects. In this paper, we discuss information flow control models to prevent illegal information to occur in the role-based access control (RBAC) model. First, we define a legal information flow relation r<sub>i</sub>&#x21D2; r<sub>j</sub> among(More)