High Load average no CPU utilization

Ryan Simpkins plug at ryansimpkins.com
Wed Mar 28 12:34:29 MDT 2007


On Wed, March 28, 2007 11:44, adam fisher wrote:
> apache   17268  0.7  0.6  29552 12868 ?        D    04:27   0:04 /usr/sbin/httpd
> apache   17456  1.1  0.6  29728 13168 ?        S    04:27   0:06 /usr/sbin/httpd
> apache   17890  0.5  0.6  29928 12588 ?        D    04:28   0:02 /usr/sbin/httpd
> apache   17893  0.0  0.5  29032 11548 ?        D    04:28   0:00 /usr/sbin/httpd
> apache   17895  0.0  0.5  29184 11716 ?        D    04:28   0:00 /usr/sbin/httpd
> apache   17896  0.0  0.5  28740 11256 ?        D    04:28   0:00 /usr/sbin/httpd
> apache   17897  0.0  0.5  28912 11452 ?        D    04:28   0:00 /usr/sbin/httpd
> apache   17904  0.3  0.5  29288 11876 ?        D    04:28   0:01 /usr/sbin/httpd
> apache   17913  0.5  0.5  29316 11892 ?        D    04:29   0:02 /usr/sbin/httpd
> apache   17923  0.1  0.5  29364 12052 ?        D    04:29   0:00 /usr/sbin/httpd

> Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz
> await  svctm  %util
> sda               0.00    11.00  0.00  6.00     0.00   136.00    22.67     0.00
> 0.50   0.17   0.10

> The web root is located on an NFS share.  I restarted NFS on this box just to make
> sure.  When I restart httpd and the load average drops to around 10 or 11 I can
> browse the webpage just fine.  It is when it gets to around 150 that I can't.
>

Bingo. Your web root is running over NFS. NFS is pure evil for this type of work.
You may be able to improve performance playing around with the various NFS mount
options.

-Ryan



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