on 05:58 Thu 03 Feb, mcclnx mcc (mcclnx@xxxxxxxxxxxx) wrote:
> We have DELL R900 server with 128GB RAM (CENTOS 5.5)in it. This
> server only have one application running and few people use it.
>
> Every week I ata least get one or two messages from monitor tool mail
> to me say:
>
> Message=Memory Utilization is 92.02%, crossed warning (80) or critical
> (90) threshold.
>
> Since server have 128 GB RAM and only 1 application. I really don't
> belive that. Does there has some way can check memory utilitation ?
Make sure your tool is reporting utilization less cache.
As others have noted, the "-/+ buffers/cache" line in "free" output is
what you're looking for.
http://www.linuxatemyram.com/
If you've got sar (sysstat) installed and activated (read the manpage
and /usr/share/doc/sysstat* materials if not), numerous system resource
usages are logged every ten minutes. For memory usage: 'sar -r':
12:00:01 AM kbmemfree kbmemused %memused kbbuffers kbcached kbswpfree kbswpused %swpused kbswpcad
12:10:01 AM 45877732 3573788 7.23 208792 1948316 2097144 0 0.00 0
12:20:01 AM 45875572 3575948 7.23 208792 1948336 2097144 0 0.00 0
12:30:01 AM 45877120 3574400 7.23 208796 1948352 2097144 0 0.00 0
12:40:01 AM 45878352 3573168 7.23 208796 1948368 2097144 0 0.00 0
12:50:01 AM 45876080 3575440 7.23 208800 1948384 2097144 0 0.00 0
01:00:01 AM 45877244 3574276 7.23 208800 1948408 2097144 0 0.00 0
There are tools (NOT currently in CentOS) to graph/visualize these
outputs as well.
If you want per-process accounting, you can get that as well, but it'll
cost you some performance overhead and a lot of set-up.
--
Dr. Ed Morbius
Chief Scientist
Krell Power Systems Unlimited
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
