AIX Virtual Processor Folding
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Shared Processor virtual machines (LPARs) have a setting called Virtual Processors (VP). This is the number of physical CPUs that the virtual machine can exploit.
- For capped virtual machines, the Entitlement is the maximum of compute cycles that can be used.
- For uncapped virtual machines and if space CPU cycles are available in the shared processor pool, then the VP number is the limit of the total number of CPUs that can be used.
AIX does not spread out over all the available virtual processors, because that is not efficient.If an uncapped virtual machine has an Entitlement of 4 CPUs and Virtual Processor count of 6, but only needs at that moment 1,5 CPU, then it folds away 4 and runs on two Virtual Processors.