Top is only reporting what it sees, it is not the cause. I sometimes
see behavior as you are reporting. Often it's due to either a bad
process, poorly written code, or a possible attack to the kernel, ddos.
I've watched CPU0 at 100%, then it will move to CPU1 at 100%, and leave
CPU0 at < 1%, and back again. I used to see it happen on a test system
after the M programmers wrote a new function that went haywire.
I've never done a search to find the cause on my Linux boxes, since it
usually only lasts for a few minutes. It does however wreck havoc on my
systems.
Do a 'cat /proc/loadavg' to see the current dynamic load average. or try
'uptime' that too reports load average. It may be normal for an Oracle
server to have a load this high. Also look into 'sar' data to get a
history of your machine.
Knabe, Troy wrote:
I have a development box that has Oracle Application Server on it. Yesterday we received a complaint that it was "slow" and top showed 0% idle and load averages of 15+ across all three settings. Then after a minute or two cpu went back to 99% idle but even today the load averages show 15+, but the CPU continues to be 99% idle. There does not appear to be i/o wait, and after the minute or two yesterday performance of the application is as expected. Anyone else seen issues with top like this before?
Thanks
-Troy
--
veritatas simplex oratio est
-Seneca
Andrew Bacchi
Systems Programmer
Rensselaer Polytechnic Institute
phone: 518.276.6415 fax: 518.276.2809
http://www.rpi.edu/~bacchi/
--
redhat-list mailing list
unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list
