OpenSolaris

Resource Controls

Resource controls are resource limits that may be placed on several entity types: 

• processes
• tasks
• projects
• zones

Overview

The following commands can be used to manipulate resource controls.

• rctladm(1m) lists the resource controls available on the system.
• prctl(1) will display and modify resource controls on currently running entities.
   zonecfg(1m) can be used to set zone. resource controls that take effect when a zone boots.  See Zones and Resource Management
• projmod(1m) can be used to configure project(4) to set resource controls automatically when a process joins a project.

Resource control behavior and relationship to rlimits.

• Resource controls will not effect resources already consumed.  For example, setting zone.max-lwps to 100 on a zone which already has 200 lwps will not kill any lwps.  It will only prevent new lwps from being created.
• Legacy process resource limits, such as limit/ulimit(1) and rlimits(getrlimit(2)) are implemented using resource controls, and can be viewed using prctl(1).  Using both prctl(1) and limit/ulimit(1) to set resource controls should be done with care.

Active Development and Future Work

• CPU Caps
• New zones resource controls, see RM for zones