Design and Implementation of an OGSA Compliant Grid Service Orchestration and Scheduling Environment

Resource planning and scheduling for a given job is a central issue in the scientific problem solving Grid oriented environments. The workflow oriented approach to this issue has the advantage of efficient allocation of resources at the workflow level by revising the allocation solution at the task level based on requirements of subsequent tasks. The PEGAF project aims at providing a platform for workflow oriented applications development, implementing adaptive scheduling strategies. After an overview of the adopted OGSA based conceptual framework, the paper presents the PEGAF platform functionality and the Service Infrastructure architecture being implemented as part of PEGAF project.