By Björn Schnizler
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Extra resources for Resource Allocation in the Grid
GRID TECHNOLOGIES 15 on protocols required for interoperability among distributed resources, third generation architectures specify the nature of resource interfaces that respond to these protocol messages. Third generation systems stress behavior and functionality of Grid components and complement former protocol-oriented concepts (Foster et al. 2002b). As a result of these developments reflecting a holistic view on distributed resource sharing, the term Grid is defined as follows (Foster 2002, p.
Among others, these functions concern security, discovery, and status management mechanisms. A container extends the underlying hosting platform by adding a set of Web service specifications such as WSRF and WS-Security. Grid applications, just as a storage service or a SAP R/3 service, are managed within this container. Clients: A client can use a set of predefined libraries which are typically required for the invocation of a distributed service. Subsequently, the client can access any userdeveloped service from a service provider using either Web service messaging or alternative communication protocols.
Second, allocation decisions can be inefficient due to first-come first-serve strategies. Unfortunately, the first shortcoming makes the second one more severe, as only a minimum of resources are contributed to the Grid and demand for resources may be very large5 . Consequently, there will be a situation of an extremely large excess demand for resources (Schnizler et al. 2005). 2 Priority Sharing Priority sharing models extend community based mechanisms by including dynamically adaptable agent weight functions into the allocation decision.