1. A method of facilitating determination of scheduling priorities of jobs in a processing environment, said method comprising: allocating zero or more usage shares of a resource to a user entity of the processing environment, said zero or more usage shares being at least a portion of a plurality of usage shares defined for the processing environment based on a total amount of the resource available in the processing environment independent of an amount of the resource consumed by one or more user entities; and assigning a job scheduling priority to a job of the user entity to be executed, said job scheduling priority being based on allocated and used usage shares of the user entity and is independent of use of the resource by other user entities.