AIX服务器lparstat输出解析咨询：CPU分配、使用及空闲值提取

Hey there, let's break down your lparstat output step by step to make sense of your AIX server's CPU allocation, usage, and idle stats.

First, here's your raw lparstat output formatted for clarity:

type=Shared mode=Uncapped smt=4 lcpu=12 mem=24576MB psize=5 ent=0.30
%user %sys %wait %idle physc %entc lbusy vcsw phint %nsp %utcyc
----- ----- ------ ------ ----- ----- ------ ----- ----- ----- ------
37.4  30.4  4.0    28.2   0.96  320.0 22.0   14315232399 16476954189 101 1.04

1. Overall CPU Allocation (System Configuration Fields) #

These fields define how CPU resources are allocated to your LPAR:

• type=Shared: Your LPAR runs in shared CPU mode, meaning it shares physical CPU cores with other LPARs on the same frame.
• mode=Uncapped: Your LPAR can consume more than its guaranteed entitled capacity if there's unused CPU available on the frame.
• smt=4: Simultaneous Multi-Threading is enabled, with 4 logical threads running per physical core.
• lcpu=12: 12 logical CPUs (threads) are assigned to this LPAR.
• ent=0.30: Entitled Capacity — the guaranteed amount of CPU your LPAR gets, measured in physical CPU equivalents (0.3 physical cores worth of processing power).

2. CPU Usage & Idle Metrics (Key Stat Columns) #

Let's map the critical columns to what they mean for your server's CPU activity:

• %user: Percentage of CPU time spent running user-level applications (37.4% in your output).
• %sys: Percentage of CPU time spent on kernel/system-level tasks (30.4% here).
• %wait: Percentage of CPU time waiting for I/O operations to finish (4.0% here).
• %idle: Idle CPU percentage — this is the metric you're looking for, representing unused CPU capacity (28.2% in your case).
• physc: Actual physical CPU capacity consumed by the LPAR (0.96 physical cores used).
• %entc: Percentage of your entitled capacity being utilized (320.0% — since your LPAR is uncapped, it's using 3.2x its allocated 0.3 entitlement).
• lbusy: Percentage of logical CPUs that are actively busy (22.0% — ~2.64 of your 12 logical CPUs are in use).

3. Extracting Specific Metrics Programmatically #

If you need to pull these values for scripting or monitoring, use tools like awk or sed to target specific columns:

• Extract idle CPU percentage (%idle):

  lparstat | awk 'NR==4 {print $4}'
  

• Extract entitled capacity (ent):

  lparstat | awk 'NR==2 {print $6}' | cut -d'=' -f2
  

• Extract physical CPU consumed (physc):

  lparstat | awk 'NR==4 {print $5}'
  

Note: Line numbers (NR==2, NR==4) might shift slightly depending on your AIX version — adjust them based on where the config line and stats line appear in your output.

内容的提问来源于stack exchange，提问作者Emma