monitoring domain resource usage

monitoring domain resource usage

[Diwaker Gupta]

Hi,

I'm interested in monitoring the CPU and memory consumption for each
xenU domain. 'top' doesn't really report anything. Is there some neat
way of doing this?

TIA
-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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RE: monitoring domain resource usage

[Neugebauer, Rolf]

There currently is no such tool, however xen exports via the control
interface to dom0 the relevant information. E.g. 'xm list' reports cpu
time consumed per VM. It should be straight forward to implement a tool
periodically calling this interface and compute CPU percentages. This
could either be done via the 'xm' interface or the xen.lowlevel.xc
interface. The latter should have less overhead.

Rolf



> -----Original Message-----
> From: xen-devel-admin@lists.sourceforge.net [mailto:xen-devel-
> admin@lists.sourceforge.net] On Behalf Of Diwaker Gupta
> Sent: 19 October 2004 20:18
> To: xen-devel@lists.sourceforge.net
> Subject: [Xen-devel] monitoring domain resource usage
> 
> Hi,
> 
> I'm interested in monitoring the CPU and memory consumption for each
> xenU domain. 'top' doesn't really report anything. Is there some neat
> way of doing this?
> 
> TIA
> --
> Diwaker Gupta
> http://resolute.ucsd.edu/diwaker
> 
> 
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Re: monitoring domain resource usage

[Diwaker Gupta]

On Tue, 19 Oct 2004 21:52:59 +0100, Neugebauer, Rolf
<rolf.neugebauer@intel.com> wrote:
> There currently is no such tool, however xen exports via the control
> interface to dom0 the relevant information. E.g. 'xm list' reports cpu
> time consumed per VM. It should be straight forward to implement a tool
> periodically calling this interface and compute CPU percentages. This
> could either be done via the 'xm' interface or the xen.lowlevel.xc
> interface. The latter should have less overhead.

I played around with 'xm list' but soon ran into problems. I'm not
sure if this is specific to a particular CPU scheduler, or a general
problem that others have noticed too.

Right now I have xen (booted using sched=atropos) running two VMs,
each running a CPU intensive job. However, the cpu-time (as reported
by xm list -l) does not seem to be changing *at all*, even across runs
lasting for minutes. The uptime gets updated properly, though.

Is this a known issue?
-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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Re: monitoring domain resource usage

[Matthieu PATOU]

On October 20, 1:53 am Diwaker Gupta <diwakergupta@gmail.com> wrote:
> On Tue, 19 Oct 2004 21:52:59 +0100, Neugebauer, Rolf
> <rolf.neugebauer@intel.com> wrote:
> >  There currently is no such tool, however xen exports via the control
> >  interface to dom0 the relevant information. E.g. 'xm list' reports cpu
> >  time consumed per VM. It should be straight forward to implement a
> >  tool periodically calling this interface and compute CPU percentages.
> >  This could either be done via the 'xm' interface or the
> >  xen.lowlevel.xc interface. The latter should have less overhead.
>
> I played around with 'xm list' but soon ran into problems. I'm not
> sure if this is specific to a particular CPU scheduler, or a general
> problem that others have noticed too.
>
> Right now I have xen (booted using sched=atropos) running two VMs,
> each running a CPU intensive job. However, the cpu-time (as reported
> by xm list -l) does not seem to be changing *at all*, even across runs
> lasting for minutes. The uptime gets updated properly, though.
>
> Is this a known issue?
> --
Does your domain really use cpu ? if not cpu usage should not vary a lot in
a couple of minutes ... run a find / to see if you see something moving ...


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Re: monitoring domain resource usage

[Diwaker Gupta]

> Does your domain really use cpu ? if not cpu usage should not vary a lot in
> a couple of minutes ... run a find / to see if you see something moving ...

Like I mentioned, both domains are running CPU intensive jobs. Between
measurements I opened consoles to both domains, ran top, closed the
console. The cpu-time values are reported to the 8th decimal place or
something -- and the values hadn't changed by even a single bit.

-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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Re: monitoring domain resource usage

[Rolf Neugebauer]

On Wed, 2004-10-20 at 00:53, Diwaker Gupta wrote:
> On Tue, 19 Oct 2004 21:52:59 +0100, Neugebauer, Rolf
> <rolf.neugebauer@intel.com> wrote:
> > There currently is no such tool, however xen exports via the control
> > interface to dom0 the relevant information. E.g. 'xm list' reports cpu
> > time consumed per VM. It should be straight forward to implement a tool
> > periodically calling this interface and compute CPU percentages. This
> > could either be done via the 'xm' interface or the xen.lowlevel.xc
> > interface. The latter should have less overhead.
> 
> I played around with 'xm list' but soon ran into problems. I'm not
> sure if this is specific to a particular CPU scheduler, or a general
> problem that others have noticed too.
> 
> Right now I have xen (booted using sched=atropos) running two VMs,
> each running a CPU intensive job. However, the cpu-time (as reported
> by xm list -l) does not seem to be changing *at all*, even across runs
> lasting for minutes. The uptime gets updated properly, though.
> 
> Is this a known issue?

I can not reproduce this. I run two while one loops in two domains and
cpu time goes up...i have not tested with different scheduling
parameters. This is on a machine with xen 2.0 as off a week or so ago. 

In general atropos is not really tested that much.

Rolf



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Re: monitoring domain resource usage

[Diwaker Gupta]

> I can not reproduce this. I run two while one loops in two domains and
> cpu time goes up...i have not tested with different scheduling
> parameters. This is on a machine with xen 2.0 as off a week or so ago.

And this is using the atropos scheduler? Quite weird. I'm running some
more tests, and I'll get back with some more results once I'm done.

-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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