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In the first phase of the European DataGrid project, the 'workload management' package (WP1) implemented a working prototype, providing users with an environment allowing to define and submit jobs to the Grid, and able to find and use the " best " resources for these jobs. Application users have now been experiencing for about a year with this first release(More)
Efficient and robust system for accessing computational resources and managing job operations is a key component of any Grid framework designed to support large distributed computing environment. Computing Resource Execution and Management (CREAM) is a simple, minimal system designed to provide efficient processing of a large number of requests for(More)
Application users have now been experiencing for about a year with the standardized resource brokering services provided by the 'workload management' package of the EU DataGrid project (WP1). Understanding, shaping and pushing the limits of the system has provided valuable feedback on both its design and implementation. A digest of the lessons, and " better(More)
Semantic grid is becoming a key enabler for next generation grid and the need of supporting process description and enactment, by means of composition of multiple resources, emerged as one of the fundamental requirements. Within NextGRID project, the idea of adopting business processes (expressed as workflow policies) as architectural components in a next(More)
The workload management task of the DataGrid project was mandated to define and implement a suitable architecture for distributed scheduling and resource management in a Grid environment. The result was the design and implementation of a Grid Workload Management System, a super-scheduler with the distinguishing property of being able to take data access(More)
The service orchestration problem is a problem of making multiple services coordinate themselves and communicate in an orderly fashion so as to accomplish a task more complex than the single tasks provided by the individual composing services. By enabling this orchestration in a controlled manner it is possible to create value-added services. The Akogrimo(More)
Contemporary Grids are characterized by a middleware that provides the necessary virtualization of computation and data resources for the shared working environment of the Grid. In a large-scale view, different middleware technologies and implementations have to coexist. The SOA approach provides the needed architectural backbone for interoperable(More)
Workflows have an increasing role in scientific applications programming and business environment development because they are an effective technology to define composition of different pieces of knowledge, both in the application domain and in the business context. However, workflows are addressed in a number of different perspectives and no consensus has(More)
Dozens of satellites are constantly collecting data about our planetary system-the Earth in particular-24 hours a day 365 days a year. Satellite data is used for many purposes, for example for telecommunications , navigation systems and environmental monitoring. However, even with the most powerful computers processing all this data is time-consuming and(More)