Atmospheric models usually demand high processing power and generate large amounts of data. As the degree of parallelism grows, the I/O operations may become the major impacting factor of their performance. This paper evaluates the Ocean-Land-Atmosphere Model (OLAM) on the PVFS file system in order to point the I/O characteristics of the application. We show that storing the files on PVFS has l...

File sharing, typically involving video or audio material in which copyright may persist and using peer-to-peer (P2P) networks like BitTorrent, has been reported to make up the bulk of Internet traffic (Pouwelse et al., 2008; Kryczka et al., 2011). The free-riding problem appears in this “digital gift economy” but its users exhibit rational behaviour (Becker and Clement, 2006), subject to the c...

Scientists who do in silico or computer-based experiments use general purpose computer tools, like Web browsers and word processors to carry out their tasks. As such, they have no formal file management support for collecting, coordinating, annotating and reflecting on their digital experimental traces. In this presentation we look at how we are exploring the use of implicit context histories t...

Peer-to-peer (p2p) network is an alternative of client/server system for sharing resources, e.g. files. P2P network is a robust, distributed and fault tolerant architecture. We consider the scenario of p2p network over MANET where all nodes are the members of p2p network and one of the node acts as p2p server which maintains the file list available to the nodes. The mobility of nodes constantly...

There are already many projects try to tell us how to use NS-2 easily, while not as that difficult as its official manual says. However, how to easily use NS-2 to do performance evaluation is still lacking. Usually, a trace file which comes out from one time NS-2 simulation is larger than 600MB, to analysis this huge file definitely will cost great time. Till now, there are many evaluation meth...

Cloud computing is hot cake nowadays and primary factor of cloud computing is virtualization. It deals with on demand dynamic resource allocation for providing reliable and guaranteed services to the consumer. It is based on pay-as-you-use model to public. The tasks of resource allocation are meeting customer demands and application requirements. To get more efficient resources from cloud envir...

In this paper, we propose an active file mode change mechanism in which the synchronization system of cloud storage automatically changes files a directory client to online or local by considering tradeoff between usage and access time according activation ratio. When ratio rises above certain threshold, proposed selects based on delay them reduce IoT clients. falls below last increase availabl...

UNLABELLED Data in the EMBL Nucleotide Sequence Database is traditionally available in a flat file format that has a number of known shortcomings. With XML rapidly emerging as a standard data exchange format that can address some problems of flat file formats by defining data structure and syntax, there is now a demand to distribute EMBL data in an XML format. XEMBL is a service tool that emplo...

Mass storage systems are finding greater use in scientific computing research environments for retrieving and archiving the large volumes of data generated and manipulated by scientific computations. This paper presents a queuing network model that can be used to carry out capacity planning studies of hierarchical mass storage systems. Measurements taken on a Unitree mass storage system and a d...