On Wed, Oct 31, 2012 at 10:23 AM, Eoghan Glynn <egl...@redhat.com> wrote:
> > > Hi Yawei Wu, > > The root of the confusion is the fact the cpu meter is reporting > the cumlative cpu_time stat from libvirt. This libvirt counter is > reset when the associated qemu process is restarted (an artifact > of how cpuacct works). > > So when you stop/start or suspend/resume, a fresh qemu process > is sparked up, then the cumulative time is reset. > > Thanks for bringing this up, as it has implications as to how > we meter CPU time and utilization[1]. > > We may need to start metering the delta between CPU times on > subsequent polling cycles, instead of using a cumulative meter > (dealing with the edge case where the instance has been restarted > within a polling period). > Good idea. We need to capture this issue to make sure we get it onto the roadmap for this cycle. Is there a bug or blueprint for it yet? Doug > > Cheers, > Eoghan > > [1] https://review.openstack.org/14921 > > > > I am still testing ceilometer now. I am confused about the meter > > volume > > in the mongodb. Let's talk about cpu usage. > > > > After I create and boot a vm named vm_1, meter data record about cpu > > usage will be inserted into db in cycle(default 10 minutes). For > > example,the 'counter_volume' of the first record is '52060000000',and > > the second one is '123890000000'. > > > > 1) '123890000000' nanoseconds means '123.89' seconds or two > > minutes,it > > seem like to be 1238.9 seconds actually, is there something wrong ? > > > > 2) If I never reboot or suspend vm_1, will the 'counter_volume' of > > cpu > > usage record increase all the time ? Just like '8 minutes' -> '18 > > minutes' -> '28 minutes' ? > > > > 3) If I reboot or suspend vm_1, I find that the 'counter_volume' of > > cpu > > usage record will count from zero. Just like '8 minutes' -> '18 > > minutes' > > -> '28 minutes' [-> '0 minutes'] ->'5 minutes' -> '15 minutes'. Does > > it > > mean that 'counter_volume' just represents how long has vm_1 been > > booted > > up ? > > > > 4) This one is about Web API. I find that "GET > > /v1/resources/(resource)/meters/(meter)/volume/sum" just return the > > sum > > value of all the cpu 'counter_volume', like '8 minutes' + '18 > > minutes'. > > Is it reduplicate ? > > > > 5) If I want to know how long has vm_1's cpu been used yesterday, how > > can I do ? > > > > It seems like that I have too many questions.. > > > > Thank you very much ! > > > > > > ----------------------- > > Yawei Wu > > Dalian Hi-Think Computer Technology,Corp. > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~openstack > > Post to : openstack@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~openstack > > More help : https://help.launchpad.net/ListHelp > > > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp >
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