VMM memory load control tuning with the schedo command

With the schedo command, the root user can affect the criteria used to determine thrashing, the criteria used to determine which processes to suspend, the length of time to wait after thrashing ends before reactivating processes, the minimum number of processes exempt from suspension, or reset values to the defaults.

The VMM memory load control facility, described in VMM memory load control facility, protects an overloaded system from thrashing.

For early versions of the operating system, if a large number of processes hit the system at the same time, memory became overcommitted and thrashing occurred, causing performance to degrade rapidly. A memory-load control mechanism was developed that could detect thrashing. Certain parameters affect the function of the load control mechanism.

# lslpp -lI bos.perf.tune