Open Stack

Thanks a lot Piyush.  That helps a lot!

 

I think delta counter makes more sense too.  In that way, the billing system
can simply query something like
/v2/meters/cpu/statistics?groupby=resource_id and then the “sum” value is
the “total cpu time consumed” by each VM.  Otherwise, billing system needs
to go through each and every cpu sample.

 

Thanks again~

 

 

- Kurt Rao

 

发件人: Piyush Masrani [mailto:pmasrani at vmware.com] 
发送时间: 2014年7月4日 13:28
收件人: openstack at lists.openstack.org
抄送: Akhil Sadashiv Hingane; Kumar Gaurav
主题: RE: [Openstack] [Ceilometer] Question regarding the meter "cpu time
used"

 

Hi Kurt,

 

Your understanding is correct about the the 'cpu time used' meter. It is a
cumulative meter, ever increasing since boot-up and reset to zero on
restart. Vsphere does not support this meter. Details about meters supported
by different hypervisors can be found at:
http://docs.openstack.org/developer/ceilometer/measurements.html#compute-nov
a. 

You can use 'cpu_util' meter instead which is of type 'gauge', if it
satisfies your requirement.

 

Personally, I think a 'delta' counter will make more sense. However, you can
derive the delta value by comparing two consecutive values for the
cumulative meter and figuring out the difference.

 

Hope that helps.

 

Thanks,

Piyush

 

From: [mailto:raodingyuan at chinacloud.com.cn] 
Sent: Thursday, July 03, 2014 3:15 PM
To: openstack at lists.openstack.org <mailto:openstack at lists.openstack.org> 
Subject: [Openstack] [Ceilometer] Question regarding the meter "cpu time
used"

 

Hi folks,

 

I found that the “cpu time used” meter actually means “cpu time used
*since last boot-up*”, at least in libvirt environments. It will be reset
to ZERO after VM restart. As far as I understand, a cumulative type meter
should be strictly increasing, so it looks very strange to me.

 

My questions are:

1, Since I have libvirt environment only, I haven’t tested on vsphere or
any others. Does it behave the same in other environments?

2, Is it intended to be like this?

2, What should a billing system do to correctly use this meter?

 

Please help :)

 

Thanks a lot!

 

 

Kurt Rao

ChinaCloud Information Technology Co., Ltd.

E_mail:  <mailto:raodingyuan at chinacloud.com.cn>
raodingyuan at chinacloud.com.cn

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