Fine-grained data replication over the Internet allows duplication of frequently accessed data objects, as opposed to entire sites, to certain locations so as to improve the performance of largescale content distribution systems. In a distributed system, agents representing their sites try to maximize their own benefit since they are driven by different goals such as to minimize their communica...

The large-system performance of maximum-a-posterior estimation is studied considering a general distortion function when the observation vector is received through a linear system with additive white Gaussian noise. The analysis considers the system matrix to be chosen from a large class of random ensembles. We take a statistical mechanical approach by introducing a spin glass corresponding to ...

Replica exchange molecular dynamics is a multicanonical simulation technique commonly used to enhance the sampling of solvated biomolecules on rugged free energy landscapes. While replica exchange is relatively easy to implement, there are many unanswered questions about how to use this technique most efficiently, especially because it is frequently the case in practice that replica exchange si...

In data centers, data replication is the primary method used to ensure avail-ability of customer data. To avoid correlated failure, cloud storage infras-tructure providers model hierarchical failure domains using a tree, and avoidplacing a large number of data replicas within the same failure domain (i.e.on the same branch of the tree). Typical best practices ensure that replica...

The energy consumption of computational platforms has recently become a critical problem, both for economic and environmental reasons [35]. To reduce energy consumption, processors can run at different speeds. Faster speeds allow for a faster execution, but they also lead to a much higher (superlinear) power consumption. Energy-aware scheduling aims at minimizing the energy consumed during the ...

In last half decade, there is tremendous growth in the network applications; we are experiencing an information explosion era. Due to which large amount of distributed data being managed and stored. To handle these types of data, application uses distributed file system. Advantages of DFS are increased availability and efficiency. Generally some parameters like scalability, reliability, transpa...

Farsite is a scalable, distributed file system that logically functions as a centralized file server but that is physically implemented on a set of client desktop computers. Farsite provides high degrees of reliability and availability by storing replicas of files on multiple machines. Replicas are placed to maximize the effective system availability, using a distributed, iterative, randomized ...

The statistical mechanics of a two-state Ising spin-glass model with finite random connectivity, in which each site is connected to a finite number of other sites, is extended in this work within the replica technique to study the phase transitions in the three-state Ghatak-Sherrington (or random Blume-Capel) model of a spin glass with a crystal-field term. The replica symmetry ansatz for the o...

This paper studies performance and timing failure probability of time-shifted redundant circuits and path-/circuit-replica circuits. Measurement-based experiments using a fabricated test chip are performed. For an approximately similar false positive error probability for the path-replica and circuit-replica, the false negative error probability of the circuit-replica is approximately two order...

The Farsite distributed le system stores multiple replicas of les on multiple machines, to provide le access even when some machines are unavailable. Farsite assigns le replicas to machines so as to maximally exploit the di erent degrees of availability of di erent machines, given an allowable replication factor R. We use competitive analysis and simulation to study the performance of three can...