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COPS: A Framework for Consumer Oriented Proportional share Scheduling
Scheduling forms an important aspect of operating systems because it has a direct impact on
system performance. Most existing general-purpose schedulers use a priority-based scheme to
schedule processes. Such priority-based mechanisms cannot guarantee proportional fairness
for every process. Proportional share schedulers maintain fairness among tasks based on
given weight values. In both of these scheduler types, the scheduling decision is done perprocess.
However, system usage policies are typically set on a per-consumer basis, where a
consumer represents a group of related processes that may belong to the same application
The COPS framework uses the idea of consumer sets to group processes. Its design guarantees
system usage per consumer, based on relative weights. We have added a share management
layer on top of a proportional share scheduler to ease the administrative job of share
assignment for these consumer sets. We have evaluated our system in real world scenarios
and show that the CPU usage for consumer sets with CPU-bound processes complies with
the administrator-defined policy goals.