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000-221 · Question #192

The nmon output below illustrates typical load when the hosted application is running at peak times. What can be observed from the output?

The correct answer is A. Entitled CPU allocation is set too high. The nmon output reveals that the partition's actual CPU consumption at peak is well below its entitled allocation, indicating the entitlement is configured higher than necessary.

Performance Monitoring and Tuning

Question

The nmon output below illustrates typical load when the hosted application is running at peak times. What can be observed from the output?

Exhibit

000-221 question #192 exhibit

Options

  • AEntitled CPU allocation is set too high.
  • BVirtual processor allocation is set too low.
  • CEnabling SMT4 would improve performance.
  • DProcessor folding is restricting available resources

How the community answered

(32 responses)
  • A
    75% (24)
  • B
    9% (3)
  • C
    3% (1)
  • D
    13% (4)

Why each option

The nmon output reveals that the partition's actual CPU consumption at peak is well below its entitled allocation, indicating the entitlement is configured higher than necessary.

AEntitled CPU allocation is set too high.Correct

In IBM Power Systems LPAR environments, CPU entitlement defines the guaranteed processor capacity assigned to a partition. When nmon shows that peak workload utilization is significantly lower than the entitled CPU value, the partition holds more guaranteed capacity than it ever consumes, wasting resources that could be redistributed to other partitions on the system.

BVirtual processor allocation is set too low.

Virtual processor allocation being too low would appear as high run-queue depth or CPU wait times under load, not as consistent underutilization of entitled capacity.

CEnabling SMT4 would improve performance.

Enabling SMT4 increases thread-level parallelism per core and would only help if CPUs were already saturated and threads were the bottleneck, not when entitlement far exceeds actual usage.

DProcessor folding is restricting available resources

Processor folding dynamically deactivates logical processors when demand is low to conserve power, but it does not restrict access to entitled capacity and would not be shown as over-allocation in nmon.

Concept tested: IBM LPAR CPU entitlement over-allocation detection

Source: https://www.ibm.com/docs/en/aix/7.3?topic=n-nmon-command

Topics

#nmon#CPU entitlement#LPAR performance#entitled capacity

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