Basic configuration file for CPU control
A configuration file for dynamically enabling or disabling CPUs has several required specifications.
UPDATE="10"
CPU_MIN="2"
CPU_MAX="10"
HOTPLUG = "idle < 10.0"
HOTUNPLUG = "idle > 100"- UPDATE
- specifies the time interval, in seconds, at which cpuplugd evaluates the rules and, if a rule is
met, enables or disables CPUs. This variable is also required for controlling memory.
In the example, the rules are evaluated every 10 seconds.
- CPU_MIN
- specifies the minimum number of CPUs. Even if the rule for disabling CPUs is met, cpuplugd does
not reduce the number of CPUs to less than this number.
In the example, the number of CPUs cannot become less than 2.
- CPU_MAX
- specifies the maximum number of CPUs. Even if the rule for enabling CPUs is met, cpuplugd does
not increase the number of CPUs to more than this number. If 0 is specified, the maximum number of
CPUs is the number of CPUs available on the system.
In the example, the number of CPUs cannot become more than 10.
- HOTPLUG
- specifies the rule for dynamically enabling CPUs. The rule resolves to a boolean true or false.
Each time this rule is true, cpuplugd enables one CPU, unless the number of CPUs has already reached
the maximum specified with CPU_MAX.
Setting HOTPLUG to
0disables dynamically adding CPUs.In the example, a CPU is enabled when the idle times of all active CPUs sum up to less than 10.0%.
- HOTUNPLUG
- specifies the rule for dynamically disabling CPUs. The rule resolves to a boolean true or false.
Each time this rule is true, cpuplugd disables one CPU, unless the number of CPUs has already
reached the minimum specified with CPU_MIN.
Setting HOTUNPLUG to
0disables dynamically removing CPUs.In the example, a CPU is disabled when the idle times of all active CPUs sum up to more than 100%.
If one of these variables is set more than once, only the last occurrence is used. These variables are not case sensitive.
If both the HOTPLUG and HOTUNPLUG rule are met simultaneously, HOTUNPLUG is ignored.