"Arne S" <apsodal@NOSPAM.online.no> wrote in message
news:40FD2C54.60400@NOSPAM.online.no...
> Steve Nottingham wrote:
>
> > Arne S <apsodal@NOSPAM.online.no> wrote in message
news:<40fccb2a$1@news.broadpark.no>...
> >
> >>kthr memory page faults cpu
> >>----- ----------- ------------------------ ------------ -----------
> >> r b avm fre re pi po fr sr cy in sy cs us sy id wa
> >>18 0 8483035 1571613 0 0 0 0 0 0 6499 99823 13804 68 22 4
7
> >>17 1 8482913 1571734 0 0 0 0 0 0 6778 86403 14977 78 13 6
4
> >> 8 2 8483831 1570812 0 0 0 0 0 0 6969 79401 16112 67 15
10 8
> >> 8 1 8489595 1565047 0 0 0 0 0 0 6191 209083 17598 70 18
6 6
> >>11 1 8482764 1571877 0 0 0 0 0 0 6049 271784 15108 68 20
5 7
> >>10 1 8482126 1572515 0 0 0 0 0 0 6051 73168 14993 57 11 18
13
> >>12 1 8481532 1573107 0 0 0 0 0 0 6081 87441 15317 60 15 13
12
> >>10 1 8481446 1573193 0 0 0 0 0 0 6344 75612 14889 71 14 7
7
> >>16 1 8483620 1571017 0 0 0 0 0 0 7486 65699 16522 74 13 6
7
> >>
> >>I believe this machine has serious problems with CPU and not with memory
(columns "pi" and
> >>"po" are always 0).
> >>
> >>But my question is: Why is the column "us" under CPU so high instead of
the column "sy"?
> >>
> >>Anybody have other comments to the output?
> >>
> >
> >
> > us is for user processes, sys is for system processes, Oracle and HA
> > will come under us. System looks fine to me, no 0's under idle You
> > have a bit of I/O wait, but if you have very fast processors then that
> > is normal, as disk speeds ahve increased as fast as processor speeds.
> >
> > I wouldn't be concerned about this system, yet, when you start getting
> > 0 in the id column for a long time, then you have a CPU bottleneck.
> > Are users complaining of slow response ?
> Thanks for response!
>
> I thought if sum of "us" and "sy" was above 80%, then you had a CPU
bottleneck. True or not?
> I have done some measures for a week or so, and the "id" is quite low
between 07:00 am and
> 04:00 pm (from 5% to 10%). And yes, the users complain about slow
performance....
> The oracle procs are stealing the most of the CPU power, and many of the
oracle procs have
> lots of CPU time (Oracle db procs (smon, pmon,arch... not included).
>
> The column "r" to the left from vmstat output often shows a value above
30, is that
> normal? I have even seen the value 98 in this column, I think that is too
high to get good
> performance?
>
> Both of the nodes have 6 CPU's.
>
> Arne S

us is not for user process, it's for time the processor spent running user
instructions,
sy is for time spent running kernel instructions. a user process can
accumulate both.
80% cpu utilization does not represent a bottleneck. in fact neither does
100%. the only
relevant number here seems to the the kthr number, which corresponds to the
load
average and seems a little high.