As I’ve said throughout the chapter, measuring resource demand by project, although useful, is also just a beginning. A project also gives you the means to apply resource limits by workload rather than by user or individual processes.
Chapter 10 covers the general concept of resource management as it applies to the whole system, in particular CPU resources (known as pools), process scheduling, and physical memory resources (known as resource caps). You can refer to the discussion in Chapter 11 for details on establishing file system quotas. Resource controls themselves (rctls, for short) apply to the project database and therefore affect only projects and the tasks and processes they govern.