Adjusting the Active Memory Expansion configuration to improve performance

You can run the Active Memory™ Expansion planning tool to generate performance statistics for an AIX® logical partition that uses Active Memory Expansion. Then, you can change the Active Memory Expansion factor, the memory assignment, or the processor assignment of the logical partition to improve its performance.

1. Run the Active Memory Expansion planning tool, which is the amepat command, from the AIX command line interface. When you run the planning tool on a workload that currently uses Active Memory Expansion, the tool generates a report that provides the following information:
   • Various statistics about memory compression and processor consumption.
   • Several alternative configuration possibilities for Active Memory Expansion on the logical partition.
   • Recommended configuration to improve the performance of Active Memory Expansion on the logical partition.
   Tip: You can view more detailed statistics about memory compression and processor consumption by using the vmstat, lparstat, svmon, and topas commands.
2. Perform one or more of the following tasks to adjust the configuration:
   • Dynamically change the Active Memory Expansion factor that is set for the logical partition. For instructions, see Changing the Active Memory Expansion factor for AIX logical partitions.
   • Dynamically add, move, or remove memory to or from the logical partition. For instructions, see one of the following tasks:
     • For logical partitions that use dedicated memory, see Managing dedicated memory dynamically.
     • For logical partitions that use shared memory, see Adding and removing logical memory dynamically to and from a shared memory partition.
   • Dynamically add, move, or remove processor resources to or from the logical partition. For instructions, see Managing processor resources dynamically.