A resource is any aspect of the computing system that can be
manipulated with the intent to change application behavior.
Thus, a resource is a capability that an application implicitly
or explicitly requests. If the capability is denied or
constrained, the execution of a robustly written application
proceeds more slowly. Classification of resources, as opposed to
identification of resources, can be made along a number of axes.
The axes could be implicitly requested as opposed to explicitly
requested, time-based, such as CPU time, compared to time-
independent, such as assigned CPU shares, and so forth.
Generally, scheduler-based resource management is applied to
resources that the application can implicitly request. For
example, to continue execution, an application implicitly
requests additional CPU time. To write data to a network socket,
an application implicitly requests bandwidth. Constraints can be
placed on the aggregate total use of an implicitly requested
resource. Additional interfaces can be present