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Chapter 2  Grid, Utility Computing and Clusters 

Schedulers / Resource Brokers

Schedulers are other key components in the grid environment. They are also sometimes called ‘resource brokers’

The user may select a machine suitable for running his/her job and then execute a grid command that sends the job to the selected machine. More advanced grid systems would include a job “scheduler” of some kind that automatically finds the most appropriate machine on which to run any given job that is waiting to be executed. Schedulers react to current availability of resources on the grid. These schedulers, besides carrying the job to other machines in the grid environment, have the capability to understand the resource availability on the idle machines.

In the grid system, any machine that becomes idle would typically report its idle status to the grid management node. This management node would assign the idle machine the next job that is satisfied by the machine’s resources. Scavenging of CPU cycles is usually implemented in a way that is unobtrusive to the normal machine user. If the machine becomes busy with local non-grid work, the grid job is usually suspended or delayed. This situation creates somewhat unpredictable completion times for grid jobs, although it is not disruptive to those machines donating resources to the grid.


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