Advances in Grid Computing by Zoran Constantinescu

By Zoran Constantinescu

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A set constituted of sets of atomic values) as Canfora did. The scale limits the set of admissible operations. The language developed by Canfora includes the scales required for our framework, so no change is required in this part. The point of difference here is the set of operators and functions inherited form the Object Constraint Language (OCL) Warmer & Kleppe (2003) that is used by Canfora. e. workflows) and individual tasks. In the case of workflow tasks, the operators and functions defined by Canfora are sufficient, while in the case of individual tasks the operators are not used due to tasks independency.

Note that tasks were introduced randomly with 20 tasks a time. Figure 3 shows the distribution different task sets over the resources. Each task was assigned to one of the five services (S1,S2,S3,S4,S5) overlaying the computational and data requirements. 8 GHz Dual Core with 2GB RAM. Execution 26 Advances in Grid Computing Fig. 5. The effect of computational tasks weight vector on execution success ratio Fig. 6. The effect of data tasks weight vector on execution success ratio success ratio is the metric used in the experiments to measure the framework’s ability to host and schedule variant task triplets.

G. resource monitoring and discovery, resource failures, resources ownership and policies ... etc), the process is still viewed as resource scheduling according to some criteria. The criteria are referred to as Quality of Service (QoS) attributes in grid computing context. QoS in general are non-functional characters describing a process. QoS attributes are divided into two main groups, namely objective QoS and subjective QoS. Objective QoS attributes are used to specify performance parameters including timeliness, precision, accuracy, security requirements and availability.

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