Most caching and prefetching research does not take advantage of prior knowledge of access patterns, or does not adequately address the storage issues inherent with multidimensional scientific data. Armed with an access pattern specified as an iteration over a multidimensional array stored in a disk file, we use prefetching to greatly reduce the number of disk accesses and partially hide the co...

One of the most important problems in improving file system performance is to design effective block replacement schemes for the buffer cache. Recently, replacement schemes making use of regularities of references such as sequential and looping references were proposed and shown to be more effective than purely recency or frequency based schemes such as LRU. However, these schemes classify acce...

Modern massively parallel file systems provide high bandwidth file access by striping files across arrays of disks attached to a few specialized I/O nodes. However, these file systems are hard to use and difficult to integrate with workstations and tertiary storage. RAMA addresses these problems by providing a high-performance massively parallel file system with a simple interface. RAMA uses ha...

File accesses are usually sequentially performed in existing Distributed Shared Memory (DSM) systems. These sequential file accesses will result in the accumulation of input data at the node that handles file operations, generating a bottleneck at that node and a large amount of network traffic to move the input data to other nodes for execution. Although the file access time is often neglected...

In this paper, we describe the implementation of a parallel file I/O system on TreadMarks, a page-based software Distributed Shared Memory (DSM) system built on a network of workstations. The main goal of our parallel file I/O system is to reduce filerelated network traffic in TreadMarks. This prototype employs our previously proposed variable data distribution scheme, which distributes the fil...

Nowadays individual users often have more than one computing platform, such as traditional desktop in office, laptop computers in home, and mobile smartphones in outdoor. More and more users store their data into remote file system and access them over network in every time, but user has to download the whole file to the user computer before user wants to access one file, so user has to have th...

having access to locations struck by natural environmental disasters is one of the chief necessities in urban disaster management. this paper aims to study different physical and semi-physical patterns for increasing access to different districts in a city through applying changes to the present network of routes. to attain this goal, district 6 of tehran municipality was selected for the case ...

data grid is an infrastructure that controls huge amount of data files, and provides intensive computational resources across geographically distributed collaboration. the heterogeneity and geographic dispersion of grid resources and applications place some complex problems such as job scheduling. most existing scheduling algorithms in grids only focus on one kind of grid jobs which can be data...