In addition to previous posts;
Currently - in version 3.0.1 of Ganglia - the cpu_wio metric is broken
and not reported correctly.
This is the amount of time the cpu spends waiting for I/O.
This could account for the remaining percentage of cpu usage that you
are missing.
In the upcoming 3.0.2 release cpu_wio metric should be fixed.
Kind regards,
- Ramon.
Bart Hampshire wrote:
Mike,
Thanks for taking a stab at it.
Double checking the data, 0.64 is really 0.64% and not 64%.
ps on the box doesn't indicate that gmond has a nice value of 0.
However, it does show that some of the user processes we'd expect on
the box have nice values of 15 and not 0. These processes are running
at nice level of 0 on other machines. Could this be a cause of the
behavior?
Maybe if I rephrase the question it might help...
Can anyone think of a reason that the 4 cpu metrics
(user+system+wio+idle) would not sum to near 100%? On a dual CPU
system?
Regards,
Bart Hampshire
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:ganglia-general-
[EMAIL PROTECTED] On Behalf Of michael chang
Sent: Saturday, October 08, 2005 6:41 PM
To: Bart Hampshire
Cc:
Subject: Re: [Ganglia-general] CPU Metrics Question
On 10/8/05, Bart Hampshire <[EMAIL PROTECTED]> wrote:
Hello all,
Was wondering if someone might be able to explain why it is that
we
often
see total CPU Utilization (User + System + WIO + Idle) at values
substantially below 100%. When this happens, the reported user
portion
is
almost always zero while running top on the box shows that 90+% of
the
CPU(s) is(are) being utilized by user processes. The XML stream
on the
gmond collector (we are using gmond in unicast mode) node is
reporting
the
values that appear recorded in the gmetad's RRDs. From this, it
appears
that the CPU User metric isn't registering the utilization
properly.
Linux kernel versions are 2.4.x and 2.6.x on Red Hat and SLES x86
boxes.
Sample data collected from RRD's to follow sig in which the
reported
total
sum of CPU Utilization was below 10%.
7-9-2005 13:10 User: 0.00 System: 0.56 WIO: 0.00 Idle: 0.09
Total: 0.64
7-9-2005 13:15 User: 0.00 System: 0.60 WIO: 0.00 Idle: 0.10
Total: 0.70
7-9-2005 13:20 User: 0.00 System: 0.60 WIO: 0.00 Idle: 0.10
Total: 0.70
7-9-2005 13:05 User: 0.00 System: 1.96 WIO: 0.00 Idle: 0.06
Total: 2.02
7-9-2005 13:10 User: 0.00 System: 1.30 WIO: 0.00 Idle: 0.00
Total: 1.30
7-9-2005 13:15 User: 0.00 System: 1.30 WIO: 0.00 Idle: 0.00
Total: 1.30
7-9-2005 13:20 User: 0.04 System: 1.65 WIO: 0.00 Idle: 0.90
Total: 2.59
It looks like 0.64 represents 64%, not 0.64 percent; or whatever
types
of numbers would be reported by a program such as tload.
That said, maybe ganglia is running at too high or too low of a
nice/priority value. Or your CPU has been downclocked or something
else funky.
--
~Mike
- Just my two cents
- No man is an island, and no man is unable.
-------------------------------------------------------
This SF.Net email is sponsored by:
Power Architecture Resource Center: Free content, downloads,
discussions,
and more. http://solutions.newsforge.com/ibmarch.tmpl
_______________________________________________
Ganglia-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ganglia-general
-------------------------------------------------------
This SF.Net email is sponsored by:
Power Architecture Resource Center: Free content, downloads, discussions,
and more. http://solutions.newsforge.com/ibmarch.tmpl
_______________________________________________
Ganglia-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ganglia-general
--
.--------------------------------------------.
| ing. Ramon Bastiaans |
| HPC - Systems Programmer |
|--------------------------------------------|
| SARA - Computing and Networking Services |
| Kruislaan 415 PO Box 194613 |
| 1098 SJ Amsterdam 1090 GP Amsterdam |
|--------------------------------------------|
| Mail: bastiaans ( a t ) sara ( d o t ) nl |
| Web: http://www.sara.nl/ |
| Phone: +31 (0)20 592 80 19 |
| Fax: +31 (0)20 668 31 67 |
`--------------------------------------------'
