AIX performance monitoring: CPU bottleneck Analysis

CPU bottlenecks

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Here's a brief introduction to how to use command Vmstat, Tprof, and PS to check if the system has CPU bottlenecks.

1. Vmstat

Using commands

# vmstat 1 10

p650a:/#vmstat 1 10

System configuration:lcpu=16 MEM=15744MB

KTHR memory page Faults CPU

----- ----------- ------------------------ ------------ -----------

R B AVM fre re Pi po fr SR CY in SY CS US sy ID WA

0 0 3208684 10343 0 0 0 0 0 0 19 1447 290 0 0 99-0

0 0 3208686 10341 0 0 0 0 0 0 2 1268 248 0 0 99-0

0 0 3208686 10341 0 0 0 0 0 0 1 1265 246 0 0 99-0

0 0 3208687 10340 0 0 0 0 0 0 3 1260 254 0 0 99-0

0 0 3208687 10340 0 0 0 0 0 0 1 1320 264 0 0 99-0

0 0 3208687 10337 0 0 0 0 0 0 24 4145 321 0 3 97-0

0 0 3208687 10337 0 0 0 0 0 0 9 1438 313 0 0 99-0

0 0 3208687 10334 0 3 0 0 0 0 40 2348 1110 0 0 99-0

0 0 3208687 10334 0 0 0 0 0 0 1 1323 257 0 0 99-0

0 0 3208687 10334 0 0 0 0 0 0 5 1251 242 0 0 99-0

Note: The system will run slower when the running queue has process waiting.

ID CPU idle time or percent of no I/O wait time;

The percentage of CPU I/O wait time in WA;

R the number of threads in the running queue;

If the value of ID and WA persists to a value of close to 0, the CPU is busy at this time.

Let's look at the field R (number of threads in the running queue).

The greater the number of threads waiting in the run queue, the greater the impact of system performance.