Active Memory Deduplication statistics
You can monitor Active Memory Deduplication and gather information to measure Active Memory Deduplication performance by using the Hardware Management Console (HMC) graphical interface or the command line.
You can also use the performance tools that are provided by the
operating systems to gather the metrics. The following metrics can
be monitored for Active
Memory Deduplication:
- Pool coalesced memory is the total amount of physical memory that is coalesced among all of the logical partitions during Active Memory Deduplication. This global metric is shared with all the logical partitions that are authorized to access the memory poolwide statistics. This value represents the current snapshot for memory poolwide coalesced pages.
- Logical partition coalesced memory indicates the amount of memory that is assigned to the logical partition that is coalesced with other identical memory pages, either from within the logical partition or from another logical partition.
- Virtual I/O Server (VIOS)
processor cycle used for coalescing
On a regular basis, the number of VIOS processor cycles that are used for page coalescing is calculated and compared to the time taken. Comparisons that yield percentage deltas close to zero mean that the processor cycles used for page coalescing are insignificant. This is a global metric that is shared with all of the logical partitions that are authorized to access poolwide statistics.