fabian wrote:
2009/7/5 fabian fabian@baladia.gov.kw
i notced recently that the cpu utilization peaks to abt 100 % at 4 am every day and becomes normall at 10 am
cpu 4.5%us 2.3% sy 0.0%ni 2% id 95% wa
notice the 95% wa
It looks like you might be misreading the idle % for CPU activity. A 95% idle shows the system is not doing much.
so sorry abouyt my typing
its cpu==>4.5%us sy==> 2.3% ni==> 0.0% id==> 2 % wa==> 95%
so the wa=95 %
this starts about 4 am and stops about 10 am then the CPU idle time is always between 90% to 99%
Wait means the kernel is waiting for some device i/o command(s) to complete. The CPU is idle but can't do anything useful without the results from the device, probably disk or network. Starting at 4 am makes the 'updatedb'run that builds the database for the locate command a likely culprit. Do you have a lot of files, slow disks, or perhaps some network mounts that are included?