Question about CPU utilization

Question about CPU utilization

[Eric Tessler]

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Is there anyway to get the CPU utilization for a machine as a whole - one that includes all domains (domain 0 + domain U)?
 
Eric

		
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Re: Question about CPU utilization

[Matt Ayres]

On Wed, 2005-01-19 at 17:23 -0800, Eric Tessler wrote:
> Is there anyway to get the CPU utilization for a machine as a whole -
> one that includes all domains (domain 0 + domain U)?
>  
> Eric
> 

Just to chime in... I don't believe this feature exists, but it seems to
be one that many people desire.  Some sort of tool to be able to view
resource usage of domains in a real-time environment (xentop?) with a
"batch" option for scripts would be ideal.  

The primary purposes would be to peg down what domains are using what
resources and help track down problems.  An example I can think of is if
a domain is using too much CPU and/or I/O and causing all domains to
slow down.  I'd like to be able to quickly track the trouble domain
down.  Right now knowing the total seconds a domain has used since
creation is no help in that situation.

-- 
Thanks,
Matt



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Re: Question about CPU utilization

[Steven Hand]

>On Wed, 2005-01-19 at 17:23 -0800, Eric Tessler wrote:
>> Is there anyway to get the CPU utilization for a machine as a whole -
>> one that includes all domains (domain 0 + domain U)?
>>  
>> Eric
>> 
>
>Just to chime in... I don't believe this feature exists, but it seems to
>be one that many people desire.  Some sort of tool to be able to view
>resource usage of domains in a real-time environment (xentop?) with a
>"batch" option for scripts would be ideal.  

This is on our feature list - one way we had thought of doing it was 
to fake out a process in dom0 for each domU, and just have top report 
the (aggregate) usage for each domain, but there are other options too
for the way the data is presented.  Using an event channel to either 
push or poll for load averages is probably the basic underlying 
functionality required. 

cheers, 

S.


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Re: Question about CPU utilization

[B.G. Bruce]

My $.02 - would an snmp interface/extension be posssible to the xen core
through DOM0?  We could then monitor/record/report total memory/cpu
stats and possibly /domain stats with whatever our favorite tool of the
day happened to be.

B.


On Thu, 2005-01-20 at 04:51, Steven Hand wrote:
> >On Wed, 2005-01-19 at 17:23 -0800, Eric Tessler wrote:
> >> Is there anyway to get the CPU utilization for a machine as a whole -
> >> one that includes all domains (domain 0 + domain U)?
> >>  
> >> Eric
> >> 
> >
> >Just to chime in... I don't believe this feature exists, but it seems to
> >be one that many people desire.  Some sort of tool to be able to view
> >resource usage of domains in a real-time environment (xentop?) with a
> >"batch" option for scripts would be ideal.  
> 
> This is on our feature list - one way we had thought of doing it was 
> to fake out a process in dom0 for each domU, and just have top report 
> the (aggregate) usage for each domain, but there are other options too
> for the way the data is presented.  Using an event channel to either 
> push or poll for load averages is probably the basic underlying 
> functionality required. 
> 
> cheers, 
> 
> S.
> 
> 
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> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel
> 


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Re: Question about CPU utilization

[Ian Pratt]

> My $.02 - would an snmp interface/extension be posssible to the xen core
> through DOM0?  We could then monitor/record/report total memory/cpu
> stats and possibly /domain stats with whatever our favorite tool of the
> day happened to be.

I'd like to see a little daemon written that binds to the
priv_cmd interface and reads the CPU usage data and generates
load stats etc. Having the option to export an SNMP interface
would be good, but we'll want it hooking into the rest of the
control interface too.

Ian


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Re: Question about CPU utilization

[Ronald G. Minnich]

On Thu, 20 Jan 2005, B.G. Bruce wrote:

> My $.02 - would an snmp interface/extension be posssible to the xen core
> through DOM0?  We could then monitor/record/report total memory/cpu
> stats and possibly /domain stats with whatever our favorite tool of the
> day happened to be.

This seems so unnecessary to me. SNMP means simple network management 
protocol after all. All the info we need from a domain is in memory, so 
why would it not just be there in the /sys tree?

ron


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Re: Question about CPU utilization

[Rob Gardner]

Just so somebody doesn't go off and duplicate a bunch of effort, this 
seems like a good time to announce that I've already written a 
considerable amount of code that provides detailed measurements of cpu 
usage for each domain along with some other interesting bits of data, 
for instance domain context switch frequency, etc. The code consists of 
some hooks in xen itself to record data, and an app that runs in Dom0 
that grabs the data and presents it either as a periodically updating 
text screen, or as semi-processed data through a network socket for use 
by other programs.

I'd like to make this code available to everyone by checking it in to 
the xen source, perhaps having the code activated through a build option 
or something. Then we can discuss the various ideas for the best 
interface to this data, snmp or whatever.

Rob Gardner
HP, Fort Collins





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Re: Question about CPU utilization

[B.G. Bruce]

As long as there is a way (which it sounds like there is) to get this
info from Dom0 to a management/reporting domain, I'm happy!

B.


On Thu, 2005-01-20 at 11:48, Ronald G. Minnich wrote:
> On Thu, 20 Jan 2005, B.G. Bruce wrote:
> 
> > My $.02 - would an snmp interface/extension be posssible to the xen core
> > through DOM0?  We could then monitor/record/report total memory/cpu
> > stats and possibly /domain stats with whatever our favorite tool of the
> > day happened to be.
> 
> This seems so unnecessary to me. SNMP means simple network management 
> protocol after all. All the info we need from a domain is in memory, so 
> why would it not just be there in the /sys tree?
> 
> ron
> 


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Re: Question about CPU utilization

[David Hopwood]

Steven Hand wrote:
>Matt Ayres wrote:
>>
>>Just to chime in... I don't believe this feature exists, but it seems to
>>be one that many people desire.  Some sort of tool to be able to view
>>resource usage of domains in a real-time environment (xentop?) with a
>>"batch" option for scripts would be ideal.  
> 
> This is on our feature list - one way we had thought of doing it was 
> to fake out a process in dom0 for each domU, and just have top report 
> the (aggregate) usage for each domain, but there are other options too
> for the way the data is presented.  Using an event channel to either 
> push or poll for load averages is probably the basic underlying 
> functionality required.

Polling for cumulative CPU times, rather than averages, is probably a
better interface. Then the user-mode tool can average over whatever
period it wants.

-- 
David Hopwood <david.nospam.hopwood@blueyonder.co.uk>



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RE: Question about CPU utilization

[Neugebauer, Rolf]

> -----Original Message-----
> From: xen-devel-admin@lists.sourceforge.net [mailto:xen-devel-
> admin@lists.sourceforge.net] On Behalf Of Steven Hand
> Sent: 20 January 2005 08:51
> To: Matt Ayres
> Cc: Eric Tessler; xen-devel@lists.sourceforge.net;
> Steven.Hand@cl.cam.ac.uk
> Subject: Re: [Xen-devel] Question about CPU utilization
> 
> 
> >On Wed, 2005-01-19 at 17:23 -0800, Eric Tessler wrote:
> >> Is there anyway to get the CPU utilization for a machine as a whole
-
> >> one that includes all domains (domain 0 + domain U)?
> >>
> >> Eric
> >>
> >
> >Just to chime in... I don't believe this feature exists, but it seems
to
> >be one that many people desire.  Some sort of tool to be able to view
> >resource usage of domains in a real-time environment (xentop?) with a
> >"batch" option for scripts would be ideal.
> 
> This is on our feature list - one way we had thought of doing it was
> to fake out a process in dom0 for each domU, and just have top report
> the (aggregate) usage for each domain, but there are other options too
> for the way the data is presented.  Using an event channel to either
> push or poll for load averages is probably the basic underlying
> functionality required.

Also, the dom0 interface already allows you to get information about
each domain which includes the CPU usage from each domain (total of CPU
seconds consumed). One could write a little utility to periodically poll
this info and calculate the load average. I vaguely recall someone
posting such a script a while back. 

Rolf


> 
> cheers,
> 
> S.
> 
> 
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Reporting
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> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel


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RE: Question about CPU utilization

[Ian Pratt]

> Polling for cumulative CPU times, rather than averages, is probably a
> better interface. Then the user-mode tool can average over whatever
> period it wants.

Indeed, that's why Xen exports cumulative CPU times, leaving it to
tools/daemons to do averages.

Ian


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