Re: SMP CPU Statistics

[Miguel Filipe <miguel.filipe@xxxxxxxxx>]

Hi!

On 4/30/05, Hiten Pandya <hmp@xxxxxxxxxxxxx> wrote:
> Miguel Filipe wrote:
> > Very, very nice!
> >
> > is the output similar to "mpstat" from the "sar" package present on
> > Solaris and in some other unices ?
>
>         I have heard of mpstat, but never having an MP SUN system, I am not
>         sure what kind of output it presents.  If you can send sample output
>         from the mpstat utility, I will see what I can do.

Okay, mpstat is like this:
miguel@mega ~ $ mpstat 5
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0  286   1  667   579  465  287   18   30   24    0   208   14   9   8  69
  1  284   1  706   390  315  283   19   30   27    0   789   15   9   9  67
  4  283   1  702   120  101  294   19   30   25    0   750   15   8   9  68
  5  283   1  323   439  223  290   19   30   24    0   519   15   8   9  68
  8  298   1  776   169  150  291   20   32   25    0   720   17   9   8  65
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0  360   0  952  2243 2168  304    7   34   17    0  1691    7   8  12  73
  1  259   0  872   392  265  262    6   28   15    0  1419    7  11  12  70
  4  198   0  656   107  101  288    6   30   17    0  1737   13   6   6  75
  5  209   0 1002   442  237  245    8   33   15    0  1876    9   8   4  79
  8  230   0  747   115  108  323    7   38   13    0  1726    8   7   8  78
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0  312   0  400  2267 2181  266    8   30   15    0  1706    8   7   7  78
  1  234   0  633   287  274  205    7   26   18    0  1330   13   8   6  73
  4  247   0 1708   105  100  300    5   29   16    0  1556    5   6   7  82
  5  248   0 1105   437  233  289   11   27   15    0  1405    7   7   4  82
  8  335   0  685   119  109  344   10   35   14    0  1812    7   9   7  77

the first output is usually the average since boot time.
the other ones are outputed each interval time... (sorry the bad english)
here is what the man page says:
NAME
     mpstat - report per-processor statistics

SYNOPSIS
     /usr/bin/mpstat  [ interval  [ count ]  ]

DESCRIPTION
     mpstat  reports per-processor statistics  in  tabular  form.
     Each row of the table represents the activity of one proces-
     sor. The first table summarizes  all  activity  since  boot;
     each  subsequent table summarizes activity for the preceding
     interval. All values are rates (events  per  second)  unless
     otherwise noted.

here is the description of the other colums from the man page:
     mpstat  reports the following information:

     CPU       processor ID

     minf      minor faults

     mjf       major faults

     xcal      inter-processor cross-calls

     intr      interrupts

     ithr      interrupts as threads (not counting  clock  inter-
               rupt)

     csw       context switches

     icsw      involuntary context switches

     migr      thread migrations (to another processor)

     smtx      spins on mutexes (lock not acquired on first try)

     srw       spins on readers/writer locks (lock  not  acquired
               on first try)

     syscl     system calls

     usr       percent user time

     sys       percent system time

     wt        percent wait time

from all this, the ones I consider more generally usefull are:
interrupts, context switches, syscalls, user sys, wait, idle

The mpstat in linux has a different output and syntax.. but does the
same thing..
the collums are these:
 CPU   %user   %nice %system %iowait    %irq   %soft   %idle    intr
I think they are more "self" explainatory...


>
>         Kind regards,
>
>                                 -Hiten
>                                 hmp@xxxxxxxxxxxxxxxx
>

Best regards,

--
Miguel Sousa Filipe


-- 
Miguel Sousa Filipe