||Oracle Tips by Burleson
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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