000-221 · Question #50
In the following output, what do the ec and pc columns mean?
The correct answer is B. Physical processors consumed and entitled capacity consumed. In AIX LPAR performance output from tools such as lparstat, 'pc' represents physical processors consumed and 'ec' represents entitled capacity consumed, both expressed as fractions of a physical processor.
Question
In the following output, what do the ec and pc columns mean?
Exhibit
Options
- AProgram counter and entitled CPUs
- BPhysical processors consumed and entitled capacity consumed
- CProcessor count and extra cores
- DPages compressed and elapsed context switches
- EPool compression and external compression
How the community answered
(41 responses)- A2% (1)
- B78% (32)
- C2% (1)
- D5% (2)
- E12% (5)
Why each option
In AIX LPAR performance output from tools such as lparstat, 'pc' represents physical processors consumed and 'ec' represents entitled capacity consumed, both expressed as fractions of a physical processor.
Program counter is an internal CPU register concept unrelated to LPAR performance reporting, and 'entitled CPUs' is not a standard column label in AIX performance tools.
On AIX systems running in shared processor LPAR mode, 'pc' (physical processors consumed) shows the actual physical CPU cycles used by the partition, while 'ec' (entitled capacity consumed) shows utilization relative to the partition's assigned entitlement. These two columns together reveal whether a partition is using more or less than its guaranteed share of the shared processor pool.
Processor count and extra cores describe static configuration values, not the dynamic consumption metrics that AIX continuously reports for shared LPAR environments.
Pages compressed and elapsed context switches are memory and scheduler metrics tracked under different column names in AIX performance output, not under pc and ec.
Pool compression and external compression are not valid AIX LPAR performance metric names and do not correspond to any standard lparstat or topas output columns.
Concept tested: AIX LPAR shared processor performance metrics pc and ec
Source: https://www.ibm.com/docs/en/aix/7.3?topic=l-lparstat-command
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