why "sadc" rob so much CPU load

Red Star over C

RHEL AS3, kernel 2.6.8.1

on start up, CPU loading is above 95%, and the process "sadc" robs most of them.
and the load "sadc" robs will dynamically varies when other applications run.


Why is that? and are there some methods to make it better?

I think CPU must be very unhappy now that it works so hard and be paid nothing.

Red Star over C

Then I looked into the script files.

1. /etc/cron.d/sysstat:

1. # run system activity accounting tool every 10 minutes
   
2. #*/10 * * * * root /usr/lib/sa/sa1 1 1
   
3. # generate a daily summary of process accounting at 23:53
   
4. 53 23 * * * root /usr/lib/sa/sa2 -A

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2. /usr/lib/sa/sa1:

1. #!/bin/sh
   
2. # PREFIX/lib/sa/sa1.sh
   
3. # (C) 1999-2002 Sebastien Godard <sebastien.godard@wanadoo.fr>;
   
4. #
   
5. umask 0022
   
6. DATE=`date +%d`
   
7. ENDIR=/usr/lib/sa
   
8. DFILE=/var/log/sa/sa${DATE}
   
9. cd ${ENDIR}
   
10. if [ $# = 0 ]
    
11. then
    
12.         exec ${ENDIR}/sadc 1 1 ${DFILE}
    
13. else
    
14.         exec ${ENDIR}/sadc $* ${DFILE}
    
15. fi

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Also the manpage of sadc, sa1 and sa2 was checked.

I edited the "sysstat" file to specify no intervals and counts for sa1 and let the accounting tool run at an interval of 1 minute for testing purpose. But things remained the same----the process sadc kept running endless, and another 1 minute more, another process sadc joined in. So I can imagine that as time passing by, more and more sadcs will come. :em12:

Finally and hopefullessly, I have to stop this accounting tool by editing  the line in /etc/cron.d/sysstat with a cute "#".

Still wondering.