[Milberg09] 5.6. mpstat (AIX-specific)

5.6. mpstat (AIX-specific)

mpstat [ { -a | -d | -i | -s | -h } ] [ -w ] [ interval [ count ] ]

The mpstat command (part of the bos.acctfileset) was introduced in AIX 5.3. This tool displays overallperformance numbers for all logical CPUs on your partitioned system.When you run the command, two sections of statistics are displayed. Thefirst section shows system configuration information, which isdisplayed when the command starts and whenever a change in the systemconfiguration occurs; the second section, which is displayed atuser-specified intervals, shows utilization statistics:

# mpstat 1 2

System configuration: lcpu=4 ent=0.4 mode=Uncapped

cpu  min  maj  mpc  int   cs  ics   rq  mig lpa sysc us sy wa id   pc  %ec  lcs
  0   18    0    0  524  125   56    1    0 100  100  8 58  0 34 0.01  2.1  465
  1    0    0    0  108    0    0    0    0   -    0  0 36  0 64 0.00  0.5  108
  2    0    0    0   10    0    0    0    0   -    0  0 32  0 68 0.00  0.0   10
  3    0    0    0   10    0    0    0    0   -    0  0 29  0 71 0.00  0.0   10
  U    -    -    -    -    -    -    -    -   -    -  -  -  0 97 0.39 97.3    -
ALL   18    0    0 652  125   56    1     0 100  100  0  1  0 98 0.01  2.7  593
-------------------------------------------------------------------------------

  0    3    0    0  392  127   58    1    0 100    67  5 56  0 38 0.01  1.4  331
  1    0    0    0   70    0    0    0    0   -    0  0 34  0 66 0.00  0.4    70
  2    0    0    0   10    0    0    0    0   -    0  0 32  0 68 0.00  0.0    10
  3    0    0    0   10    0    0    0    0   -    0  0 29  0 71 0.00  0.0    10
  U    -    -    -    -    -    -    -    -   -    -  -  -  0 98 0.39 98.2     -
ALL    3    0    0  482  127   58    1    0 100    67  0  1  0 99 0.01  1.8  421

  

Information given includes:

• cpu — Logical CPU processor ID

• min — Minor page faults

• ma — Major page faults

• mpc — Total number of interprocessor calls

• int — Total number of interrupts

• cs — Total number of voluntary context switches

• ics — Total number of involuntary context switches

• rq — Total run queues

• mig — Total number of thread migrations

• lpa — Logical processor affinity

• sysc — Total number of system calls

• us — CPU time spent on user activity

• sy — CPU time spent on system activity

• wa — CPU time spent waiting on I/O

• id — CPU time idle

• pc — Fraction of processor consumed

• %ec — Percentage of entitled capacity consumed

• lcs — Total number of logical context switches

The mpstatcommand is a very useful command because it reports collectioninformation for each logical CPU on your partition in a format that isclearly illustrated. You can even view SMT utilization by specifyingthe –s flag:

# mpstat -s 1

System configuration: lcpu=4 ent=0.4 mode=Uncapped

     Proc0            Proc1
      1.01%            0.02%
 cpu0    cpu1    cpu2     cpu3
  0.85%   0.16%   0.01%    0.01%
------------------------------------------------------------------
     Proc0           Proc1
      0.74%           0.02%
 cpu0    cpu1    cpu2    cpu3
  0.56%   0.18%   0.01%   0.01%