A new RAID-x (redundant array of inexpensive disks at level x) architecture is presented for distributed I/O processing on a serverless cluster of computers. The RAID-x architecture is based on a new concept of orthogonal striping and mirroring (OSM) across all distributed disks in the cluster. The primary advantages of this OSM approach lie in: (1) a significant improvement in parallel I/O ban...

This paper presents a hierarchical and easy configurable framework for the implementation of distributed evolutionary algorithms for multiobjective optimization problems. The proposed approach is based on a layered structure corresponding to different execution environments like single computers, computing clusters and grid infrastructures. Two case studies, one based on a classical test suite ...

The availability of multi-processor machines and computer clusters offer significant opportunities for constraint programming. They also present a fundamental challenge: how to exploit parallelism transparently to speed up constraint programs. Our recent research showed how to parallelize constraint programs transparently on parallel computers. This paper generalizes the approach for cluster of...

While many storage products are directly attached to personal computers, most disk array products (65% and rising) are deployed in local area network file servers. This centralization of storage resources enables effective sharing, better administrative control and less redundancy. However, it also increases dependence on network and file server performance. With the emergence of high-performan...

We develop a workload model based on the observed behavior of parallel computers at the San Diego Supercomputer Center and the Cornell Theory Center. This model gives us insight into the performance of strategies for scheduling malleable jobs on space-sharing parallel computers. We nd that Adaptive Static Partitioning (ASP), which has been reported to work well for other workloads, is inferior ...

Information Technology (IT) is the study of systems especially computers for storing, retrieving, and sending information. It uses any networking and other physical devices, infrastructures to secure and exchange all forms of electronic data. IT is used globally as a major portion of daily life and we use it nearly every day within organizations for many reasons. Our computers, mobile phones an...

Unitary coupled cluster (UCC) approaches are an appealing route to utilizing quantum hardware perform chemistry calculations, as computers can in principle UCC calculations a polynomially scaling fashion, compared with the exponential required on classical computers. Current noisy intermediate scale limited by both capacity number of logical qubits and noise introduced deep circuits for using v...

Computers are increasingly used as tools to commit crimes such as unauthorized access (hacking), drug trafficking, and child pornography. The proliferation of crimes involving computers has created a demand for special forensic tools that allow investigators to look for evidence on a suspect’s computer by analyzing communications and data on the computer’s storage devices. Motivated by the fore...

When users interact with computers, programs are run locally on the machine, and display on the local machine. Single System Image (SSI) is about taking a cluster of computers, and making them appear and behave as one system. SSI systems are typically non–interactive, batch systems. The Job Brokering Shell is a SSI model for running interactive processes on worker nodes, and having them appear ...

During the last 15 years, the supercomputing industry has been using mass-produced, off-the-shelf components to build cluster computers. Such components are not perfect for HPC purposes, but are cheap due to effect of scale in their production. The coming exa-scale era changes the landscape: exa-scale computers will contain components in quantities large enough to justify their custom developme...