Tiered architecture for remote access to data sources

Teamwork is benefited by the use of shared data sources. Also, ever increasingly, organizational work depends on the activities of team members situated in different physical locations, including both employees who work from their homes and others who have been temporarily transferred to another place. Since, for all these reasons, accessing data remotely is a growing need, organizations implement internal systems in order to control shared data access according to user privileges. In this regard, the cost of resource transportation needed to generate communication must be considered. The main contribution of this paper is the extended reference layered architecture ICDFSCV (Interface Control and Distributed File Systems - Communication Versioning). It allows to build a solution that, facilitates documents download and the creation and concurrent modification by multiple users through versioning control.Facultad de Informátic

Arquitectura para Acceso Remoto

En la actualidad, la utilización de fuentes de datos compartidas facilita el trabajo en equipo. Por este motivo las organizaciones implementan en sus locaciones sistemas con controles de acceso para compartir los datos de acuerdo a los privilegios de los usuarios. Nuevas formas de trabajo son la distribución de los miembros de un equipo en distintos lugares físicos, el trabajo desde las casas de los empleados, el traslado temporal a otra locación. Por todas estas razones, acceder a los datos en forma remota es una necesidad en crecimiento. Una respuesta a esta necesidad es la propuesta de una arquitectura referente en capas ICSAD (Interfaz, Control y Sistemas de Archivos Distribuidos). La misma permite construir una implementación que facilita la descarga de los documentos y el control de versionado para el caso en el que varios usuarios estén accediendo en modo modificación. En el laboratorio de sistemas distribuidos comenzamos a trabajar en la implementación de la arquitectura propuesta.Eje: Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI

Arquitectura para Acceso Remoto

En la actualidad, la utilización de fuentes de datos compartidas facilita el trabajo en equipo. Por este motivo las organizaciones implementan en sus locaciones sistemas con controles de acceso para compartir los datos de acuerdo a los privilegios de los usuarios. Nuevas formas de trabajo son la distribución de los miembros de un equipo en distintos lugares físicos, el trabajo desde las casas de los empleados, el traslado temporal a otra locación. Por todas estas razones, acceder a los datos en forma remota es una necesidad en crecimiento. Una respuesta a esta necesidad es la propuesta de una arquitectura referente en capas ICSAD (Interfaz, Control y Sistemas de Archivos Distribuidos). La misma permite construir una implementación que facilita la descarga de los documentos y el control de versionado para el caso en el que varios usuarios estén accediendo en modo modificación. En el laboratorio de sistemas distribuidos comenzamos a trabajar en la implementación de la arquitectura propuesta.Eje: Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI

Arquitectura para Acceso Remoto

En la actualidad, la utilización de fuentes de datos compartidas facilita el trabajo en equipo. Por este motivo las organizaciones implementan en sus locaciones sistemas con controles de acceso para compartir los datos de acuerdo a los privilegios de los usuarios. Nuevas formas de trabajo son la distribución de los miembros de un equipo en distintos lugares físicos, el trabajo desde las casas de los empleados, el traslado temporal a otra locación. Por todas estas razones, acceder a los datos en forma remota es una necesidad en crecimiento. Una respuesta a esta necesidad es la propuesta de una arquitectura referente en capas ICSAD (Interfaz, Control y Sistemas de Archivos Distribuidos). La misma permite construir una implementación que facilita la descarga de los documentos y el control de versionado para el caso en el que varios usuarios estén accediendo en modo modificación. En el laboratorio de sistemas distribuidos comenzamos a trabajar en la implementación de la arquitectura propuesta.Eje: Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI

Reification of network resource control in multi-agent systems

In multi-agent systems [1], coordinated resource sharing is indispensable for a set of autonomous agents, which are running in the same execution space, to accomplish their computational objectives. This research presents a new approach to network resource control in multi-agent systems, based on the CyberOrgs [2] model. This approach aims to offer a mechanism to reify network resource control in multi-agent systems and to realize this mechanism in a prototype system. In order to achieve these objectives, a uniform abstraction vLink (Virtual Link) is introduced to represent network resource, and based on this abstraction, a coherent mechanism of vLink creation, allocation and consumption is developed. This mechanism is enforced in the network by applying a fine-grained flow-based scheduling scheme. In addition, concerns of computations are separated from those of resources required to complete them, which simplifies engineering of network resource control. Thus, application programmers are enabled to focus on their application development and separately declaring resource request and defining resource control policies for their applications in a simplified way. Furthermore, network resource is bounded to computations and controlled in a hierarchy to coordinate network resource usage. A computation and its sub-computations are not allowed to consume resources beyond their resource boundary. However, resources can be traded between different boundaries. In this thesis, the design and implementation of a prototype system is described as well. The prototype system is a middleware system architecture, which can be used to build systems supporting network resource control. This architecture has a layered structure and aims to achieve three goals: (1) providing an interface for programmers to express resource requests for applications and define their resource control policies; (2) specializing the CyberOrgs model to control network resource; and (3) providing carefully designed mechanisms for routing, link sharing and packet scheduling to enforce required resource allocation in the network

Distributed scheduling and data sharing in late-binding overlays

Pull-based late-binding overlays are used in some of today’s largest computational grids. Job agents are submitted to resources with the duty of retrieving real workload from a central queue at runtime. This helps overcome the problems of these very complex environments, namely, heterogeneity, imprecise status information and relatively high failure rates. In addition, the late job assignment allows dynamic adaptation to changes in the grid conditions or user priorities. However, as the scale grows, the central assignment queue may become a bottleneck for the whole system. This article presents a distributed scheduling architecture for late-binding overlays, which addresses these scalability issues. Our system lets execution nodes build a distributed hash table and delegates job matching and assignment to them. This reduces the load on the central server and makes the system much more scalable and robust. Moreover, scalability makes fine-grained scheduling possible, and enables new functionalities like the implementation of a distributed data cache on the execution nodes, which helps alleviate the commonly congested grid storage services

Arquitectura en capas para acceso remoto SAD

La utilización de fuentes de datos compartidas facilita el trabajo en equipo. Por este motivo las organizaciones tienen implementan en sus locaciones sistemas con controles de acceso para compartir los datos de acuerdo a los privilegios de los usuarios. Nuevas formas de trabajo son la distribución de los miembros de un equipo en distintos lugares físicos, el trabajo desde las casas de los empleados, el traslado temporal a otra locación. Por todas estas razones, acceder a los datos en forma remota es una necesidad en crecimiento. En tal sentido, un punto a tener en cuenta es el costo de los recursos de transporte necesarios para generar la comunicación. Una respuesta a esta necesidad es la propuesta de una arquitectura referente en capas ICSAD (Interfaz, Control y Sistemas de Archivos Distribuidos). La misma permite construir una complementación que facilita la descarga de los documentos y el control de versionado para el caso en el que varios usuarios est en accediendo en modo modi caci on.WPDP- XIII Workshop procesamiento distribuido y paraleloRed de Universidades con Carreras en Informática (RedUNCI

Integrating multiple clusters for compute-intensive applications

Multicluster grids provide one promising solution to satisfying the growing computational demands of compute-intensive applications. However, it is challenging to seamlessly integrate all participating clusters in different domains into a single virtual computational platform. In order to fully utilize the capabilities of multicluster grids, computer scientists need to deal with the issue of joining together participating autonomic systems practically and efficiently to execute grid-enabled applications. Driven by several compute-intensive applications, this theses develops a multicluster grid management toolkit called Pelecanus to bridge the gap between user\u27s needs and the system\u27s heterogeneity. Application scientists will be able to conduct very large-scale execution across multiclusters with transparent QoS assurance. A novel model called DA-TC (Dynamic Assignment with Task Containers) is developed and is integrated into Pelecanus. This model uses the concept of a task container that allows one to decouple resource allocation from resource binding. It employs static load balancing for task container distribution and dynamic load balancing for task assignment. The slowest resources become useful rather than be bottlenecks in this manner. A cluster abstraction is implemented, which not only provides various cluster information for the DA-TC execution model, but also can be used as a standalone toolkit to monitor and evaluate the clusters\u27 functionality and performance. The performance of the proposed DA-TC model is evaluated both theoretically and experimentally. Results demonstrate the importance of reducing queuing time in decreasing the total turnaround time for an application. Experiments were conducted to understand the performance of various aspects of the DA-TC model. Experiments showed that our model could significantly reduce turnaround time and increase resource utilization for our targeted application scenarios. Four applications are implemented as case studies to determine the applicability of the DA-TC model. In each case the turnaround time is greatly reduced, which demonstrates that the DA-TC model is efficient for assisting application scientists in conducting their research. In addition, virtual resources were integrated into the DA-TC model for application execution. Experiments show that the execution model proposed in this thesis can work seamlessly with multiple hybrid grid/cloud resources to achieve reduced turnaround time

The Inter-cloud meta-scheduling

Inter-cloud is a recently emerging approach that expands cloud elasticity. By facilitating an adaptable setting, it purposes at the realization of a scalable resource provisioning that enables a diversity of cloud user requirements to be handled efficiently. This study’s contribution is in the inter-cloud performance optimization of job executions using metascheduling concepts. This includes the development of the inter-cloud meta-scheduling (ICMS) framework, the ICMS optimal schemes and the SimIC toolkit. The ICMS model is an architectural strategy for managing and scheduling user services in virtualized dynamically inter-linked clouds. This is achieved by the development of a model that includes a set of algorithms, namely the Service-Request, Service-Distribution, Service-Availability and Service-Allocation algorithms. These along with resource management optimal schemes offer the novel functionalities of the ICMS where the message exchanging implements the job distributions method, the VM deployment offers the VM management features and the local resource management system details the management of the local cloud schedulers. The generated system offers great flexibility by facilitating a lightweight resource management methodology while at the same time handling the heterogeneity of different clouds through advanced service level agreement coordination. Experimental results are productive as the proposed ICMS model achieves enhancement of the performance of service distribution for a variety of criteria such as service execution times, makespan, turnaround times, utilization levels and energy consumption rates for various inter-cloud entities, e.g. users, hosts and VMs. For example, ICMS optimizes the performance of a non-meta-brokering inter-cloud by 3%, while ICMS with full optimal schemes achieves 9% optimization for the same configurations. The whole experimental platform is implemented into the inter-cloud Simulation toolkit (SimIC) developed by the author, which is a discrete event simulation framework