High load (25% system) on 6450, 1+1+1=3 ;-)

Dirk Wetter dirkw at rentec.com
Tue Mar 19 11:54:00 CST 2002


well, if sar reports system time, top is showing something in D state
and i17 shows disk activity, guess you found it. you could also
use iostat btw.

look for processes having open files on partitions of this disk (lsof
is good for that).

On Tue, 19 Mar 2002, Vsevolod Ilyushchenko wrote:

> Hi,
>
> I am running stock 2.4.17 on a 6450. I have recently upgraded to 4 CPUs,
> and soon after that I began to see high load. Today it varies from 5 to 8,
> and it's not an accounting fluke - the system is very slow.
>
> The maddening thing is that I cannot figure out what's causing it. Top does
> not show any CPU-hogging programs. The only abnormal thing that I saw in
> the sar output is consistently high system time percentage:
>
> 12:00:11 AM       CPU     %user     %nice   %system     %idle
> 12:10:00 AM       all      2.77      0.42     26.22     70.60
> 12:20:09 AM       all      2.47      0.01     25.80     71.72
> 12:30:00 AM       all      2.39      0.01     25.98     71.62
> 12:40:10 AM       all      2.48      0.01     25.74     71.77
> 12:50:24 AM       all      2.49      0.01     25.86     71.64
>
> My suspicions are on SAS running some user batch programs. Most of the time
> it's in the D state according to top, but since it constantly updates a
> file in /var/tmp, it's not dead.
>
> I see somewhat high disk activity on interrupt 17:
>
> (from /proc/interrupts:
>  17:   15878552   15873368   15886390   15879782   IO-APIC-level  aic7xxx
> )
>
> 12:00:11 AM  CPU  i000/s  i001/s  i002/s  i014/s  i017/s  i018/s  i026/s
> 12:10:00 AM    0   25.16    0.00    0.00    0.00  199.71    0.00    1.74
> 12:10:00 AM    1   24.99    0.00    0.00    0.00  198.40    0.00    1.78
> 12:10:00 AM    2   25.34    0.00    0.00    0.00  202.26    0.00    1.77
> 12:10:00 AM    3   24.51    0.00    0.00    0.00  197.82    0.00    1.70
> 12:20:09 AM    0   24.96    0.00    0.00    0.00  198.46    0.00    1.16
> 12:20:09 AM    1   24.95    0.00    0.00    0.00  198.56    0.00    1.16
> 12:20:09 AM    2   24.81    0.00    0.00    0.00  198.47    0.00    1.15
>
> But this disk activity may just be the indicator of SAS writing its file.
>
> Here is free output showing that memory is fine:
>
>              total       used       free     shared    buffers     cached
> Mem:       3996696    3890456     106240          0      75036    3300428
> -/+ buffers/cache:     514992    3481704
> Swap:       530104      32792     497312
>
> I will be very grateful for any suggestions.
>
> Simon
> --
> Simon (Vsevolod ILyushchenko)   simonf at cshl.edu
> http://www.simonf.com          simonf at simonf.com
>
> "A man who feels himself a citizen of the world whose
> loyalty is to the human race and to life, rather than
> to any exclusive part of it; a man who loves his country
> because he loves mankind, and whose judgement is not
> warped by tribal loyalties." Erich Fromm
>
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