Performance considerations for shared memory partitions

Performance considerations for overcommitted shared memory partitions
Learn about how the degree to which the memory configuration of a logical partition that uses shared memory (hereafter referred to as a shared memory partition) is overcommitted affects the performance of the shared memory partition. In general, the less overcommitted the memory configuration of a shared memory partition, the better its performance.

Factors that influence the performance of shared memory partitions
In addition to overcommitment considerations, you need to consider other factors that can affect the performance of a logical partition that uses shared memory (hereafter referred to as a shared memory partition). These factors include the workload running in the shared memory partition, the I/O entitled memory of the shared memory partition, whether the operating system or applications that run in the shared memory partition use memory affinity, and whether the shared memory partition is configured to use redundant Virtual I/O Server (VIOS) logical partitions (hereafter referred to as paging VIOS partitions).

Performance statistics for shared memory
The Hardware Management Console (HMC), Integrated Virtualization Manager, and Linux environments provide statistics about the shared memory configuration.