Chapter 3. Virtualization 145
Figure 3-16 shows the Active Memory Deduplication being enabled to a shared memory pool.
Figure 3-16 Enabling the Active Memory Deduplication for a shared memory pool
The Active Memory Deduplication feature requires the following minimum components:
PowerVM Enterprise edition
System firmware level 740
AIX Version 6: AIX 6.1 TL7 or later
AIX Version 7: AIX 7.1 TL1 SP1 or later
IBM i: 7.14 or 7.2 or later
SLES 11 SP2 or later
RHEL 6.2 or later
3.4.8 Dynamic Platform Optimizer
Dynamic Platform Optimizer (DPO) is an IBM PowerVM feature that helps the user to
configure the logical partition memory and CPU affinity on the POWER7+ processor-based
servers, thus, improve performance under some workload scenarios.
On a nonuniform memory access (NUMA) context, the main goal of the DPO is to assign a
local memory to the CPUs, thus, reducing the memory access time, because a local memory
access is much faster than a remote access.
Accessing remote memory on a NUMA environment is expensive, although, common, mainly
if the system did a partition migration, or even, if logical partitions are created, suspended and
destroyed frequently, as it happens frequently in a cloud environment. In this context, DPO
will try to swap remote memory by local memory to the CPU.
Dynamic Platform Optimizer should be launched through the HMC command-line interface
with the optmem command (see Example 3-1 on page 146). The lsoptmem command is able to
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