[Xymon] High CPU Load Rendering Graphs

[Vernon Everett]

Hi all

My Xymon server 4.3.10 is burning the CPU cycles when we view multiple
graphs, like the trends page, and takes about 5 seconds to render a single
graph in a single-graph page view.

It's a Sun Fire X4150 with 4Gb of RAM, running Solaris 10 update 5..

Version                          Location Tag
-------------------------------- --------------------------
Intel(R) Xeon(R) CPU           X5460  @ 3.16GHz CPU 1

Not a very powerful box, and a bit dated, but I have seen significantly
better performance on far lesser systems.
So I am not really thinking the issue is with the hardware.
It's been slow since it was installed.
If I view the trends column, I can see the CPU load jump from below 1 to
over 10 at times.
Running prstat or top in another window while viewing the trends column,
the process ranking by CPU gets dominated by showgraph.cgi, owned by the
web server user.
Top under normal conditions.
CPU states: 99.9% idle,  0.0% user,  0.1% kernel,  0.0% iowait,  0.0% swap
Top rendering the trends column.
CPU states:  0.0% idle, 93.8% user,  6.2% kernel,  0.0% iowait,  0.0% swap

Also getting this error
(128)Network is unreachable: connect to listener on [::]:443
in my Apache error.log file, repeated every second while rendering the
graphs.
And from time to time, I get this one.
File does not exist: /opt/csw/apache2/share/htdocs/server-status

Anybody seen anything like this?
Perhaps know of somewhere I can look for more info?

I have looked at this
http://lists.xymon.com/archive/2014-January/038780.html
But it doesn't seem relevant. Only 2 errant files, and deleting them made
absolutely no difference.

Other info that may be important....
bash-3.00# ./httpd -v
Server version: Apache/2.2.22 (Unix)
Server built:   Jun  1 2012 05:09:20
bash-3.00# ./httpd -V
Server version: Apache/2.2.22 (Unix)
Server built:   Jun  1 2012 05:09:20
Server's Module Magic Number: 20051115:30
Server loaded:  APR 1.4.5, APR-Util 1.3.12
Compiled using: APR 1.4.6, APR-Util 1.3.12
Architecture:   32-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_FCNTL_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/opt/csw/apache2"
 -D SUEXEC_BIN="/opt/csw/apache2/sbin/suexec"
 -D DEFAULT_PIDLOG="/var/run/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="/var/run/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="etc/mime.types"
 -D SERVER_CONFIG_FILE="etc/httpd.conf"

Thanks
Vernon


-- 
"Accept the challenges so that you can feel the exhilaration of victory"
- General George Patton
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