cpuplugd - Control CPUs and memory

6.10 LPAR mode z/VM guest KVM guest

Use the cpuplugd command and a set of rules in a configuration file to dynamically enable or disable CPUs. For Linux® on z/VM®, you can also dynamically add or remove memory.

When Linux is running in an LPAR, setting a CPU offline can result in the LPAR status "Exceptions" in the HMC or SE. With one or more CPUs offline, this status does not necessarily indicate a problem.

Rules that are tailored to a particular system environment and the associated workload can increase performance. The rules can include various system load variables.

You can start cpuplugd from the command line in two ways:

With the service utility
Through a command-line interface

Note: Do not run multiple instances of cpuplugd simultaneously. Depending on your distribution, cpuplugd might be started automatically.