Tianyi Zang

The design and implementation of an OGSA-based grid information service

The information service is a key component of a grid environment and critical to the operation of a computational grid. In this work, an OGSA (Open Grid Services Architecture) based information service that complies with OGSI (Open Grid Services Infrastructure) is presented. The main functionality of this information service is the provision of information essential for applications running on a computational grid such as resource information, job status, resource workload, service meta-information, and queue status. This OGSI-compliant information service is built on Globus Toolkit MDS-3, and it works with meta-scheduling services and local job scheduling systems to support resource discovery, job scheduling, and execution management. In this paper, the architecture of the Information Service and the models of information data organization are presented. Some implementation issues are discussed as well.

An OGSI-compliant grid information service - its architecture and performance study

The information service is a key component of a grid environment and critical to the operation of a computational grid. This work presents an information service that complies with the OGSI (open grid services infrastructure) framework. This information service is a hierarchical structure which consists of the virtual organization level, site level and node level. We propose two models of information data organization for the information service, i.e. source-data based model and meta-data based model. Two sets of experiments were conducted to evaluate the performance of the information service. The experimental results show that the amount of data communicated between clients and the information service, and among the component services is the key factor to influence the scalability of the information service. We also found that the meta-data based model is an effective solution to improve the scalability of the information service.

Constructing an OGSA-based grid computing platform

Grid is a promising computing platform that integrates resources from different organizations in a shared, coordinated and collaborative manner to solve large-scale science and engineering problems. Recently Grid technologies are evolving towards an Open Grid Services Architecture (OGSA). The OGSA provides a uniform service-oriented architecture and integrates Grid technologies with emerging Web services standards. We are constructing a Grid computing platform based on the OGSA. This platform provides Grid services such as directory service, scheduling services and execution management services to support the execution of various Grid applications. Each Grid service in this platform is viewed as a Web service, and all these services are seamlessly integrated together to form a Grid computing environment. This paper describes the basic requirements and initial design of the architecture of this Grid computing platform, including the essential components of the platform, the key Grid services provided, as well as how these components and services are integrated. The implementation issues of this OGSA-based Grid computing platform are also discussed.

Information management for computational grids

Information Service is a key component of a Grid environment and crucial to the operation of a computational Grid. This paper presents an Information Service for a computational Grid Virtual Organization (VO). The main functionality of this Information Service is the provision of information essential for applications running on a computational Grid. This Information Service is a hierarchical structure that consists of VO layer, site layer, and resource layer. We propose different models of information data organization for Information Service, and experiments were conducted to evaluate the performance of these models. Based on the experimental results, we further introduce the data organization model for our Information Service. The implementation of the Information Service is based on the Globus Toolkit and complies with the OGSI (Open Grid Services Infrastructure) specifications. In this paper, some application experiences of using the Information Service are also presented.

An open producer and consumer management system for grid environment

Grid technologies have been widely adopted and are entering the mainstream in scientific and engineering computing. Grid technologies and infrastructures support the sharing and coordinated use of diverse resources that are geographically distributed components operated by distinct organizations and individuals with different policies. In a Grid environment, a substantial amount of runtime information requires to be gathered and delivered for various Grid services such as performance analysis, performance tuning, performance prediction, fault detection, co-scheduling and re-scheduling. Because the characteristics of runtime information are fundamentally different from the characteristics of system or program-produced data, systems that collect and distribute the information should satisfy certain requirements. Exploiting producer/consumer model, we design an open producer and consumer management framework to fit with the heterogeneous, dynamic and multi-domain nature of Grids. The security and fault-tolerance mechanisms are incorporated into the framework. Both producer and consumer are designed as Grid services and implemented using Web services technology. Based on the open framework, the management system for Grid applications monitoring is instantiated in our Grid computing project.

A grid testbed supporting MPI applications

Computational Grid is becoming a new platform for large scale science and engineering applications. We have constructed a Grid testbed using Globus toolkit and MPICH-G2 as the underlying middleware. This paper discusses the architecture of the Grid testbed and how this testbed supports the execution of MPI applications in a Grid environment. To evaluate the performance of MPI applications running on this Grid testbed, experiments were conducted and the results were analyzed.

An OGSA-based directory service

Built on the concepts and technologies of the Grid and Web services communities, Open Grid Services Architecture (OGSA) is viewed as the most promising point in Grid Computing. Our work focuses on OGSA-based directory service research which is the groundwork of Grid computing. This paper describes basic requirement and functionality of a Grid directory service. The architecture of our OGSA-based directory service is discussed. The implementation issues of this directory services are also addressed.