[CentOS] Find reason for heavy load

Christoph Maser cmr at financial.com
Thu Dec 31 11:51:01 UTC 2009


Am Donnerstag, den 31.12.2009, 12:34 +0100 schrieb Chan Chung Hang
Christopher:
> >> Look at the first two columns.  What column have higher numbers?  If r,
> >> you're CPU-bound.  If b, you're I/O bound.
> >
> > procs -----------memory---------- ---swap-- -----io---- --system--
> > -----cpu------
> >  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
> >  8  1   3092 131460 100692 833668    0    0    40    21    1    0  4  1 92  2  0
> >  9  1   3092 130708 100700 835016    0    0   578   206  577 1420 32 50  3 15  0
> >  7  1   3092 128324 100716 836148    0    0   546  2866  594 1465 31 44  7 18  0
> >  4  1   3092 126860 100724 837268    0    0   540   256  596 1505 28 43  6 23  0
> >  7  2   3092 125600 100740 838564    0    0   620   234  661 1442 30 41  2 26  0
> >  5  1   3092 124028 100756 839752    0    0   570  2692  635 1430 24 45  6 25  0
> >  6  0   3092 122040 100784 840964    0    0   584  1464  682 1434 27 44  2 28  0
> >  6  1   3092 120588 100792 842232    0    0   602   278  624 1562 32 46  2 20  0
> >  2  3   3092 120556 100840 843064    0    0   440  2908  603 1299 22 35  6 37  0
> >  3  1   3092 119832 100876 844088    0    0   430  1104  605 1348 23 36  1 40  0
> >
> > According to this, am I correct to conclude that I'm CPU bound and the
> > system is busy doing some unknown processing?
>
> Yes, these figures indicate that you are fairly close to being cpu bound.


Really? 20-30% user and ~40% sys/wait look more like I/O to mee.

Chris


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