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<div class="moz-cite-prefix">Hi Eoghan,<br>
<br>
Thanks for your reply. As we can see from the document: <br>
-------------------------------------------------------------------------<br>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<p style="margin-top: 0.8em; margin-right: 0px; margin-bottom:
0.5em; margin-left: 0px; color: rgb(0, 0, 0); font-family:
ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, 'Helvetica Neue',
sans-serif; font-size: 16px; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: 24px; orphans: 2; text-align: left; text-indent:
0px; text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255,
255); ">Three type of meters are defined in ceilometer:</p>
<table class="docutils" id="index-0" style="border-collapse:
collapse; margin: 0px -0.5em; border-width: 0px; color: rgb(0,
0, 0); font-family:
ff-meta-web-pro-1,ff-meta-web-pro-2,Arial,'Helvetica
Neue',sans-serif; font-size: 16px; font-style: normal;
font-variant: normal; font-weight: normal; letter-spacing:
normal; line-height: 24px; orphans: 2; text-align: left;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; background-color: rgb(255, 255,
255);" height="92" width="658" border="1">
<colgroup><col width="11%"><col width="89%"></colgroup><thead
valign="bottom"><tr class="row-odd">
<th class="head" style="text-align: left; padding-right:
8px; padding-top: 1px; padding-bottom: 1px; padding-left:
5px; border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Type</th>
<th class="head" style="text-align: left; padding-right:
8px; padding-top: 1px; padding-bottom: 1px; padding-left:
5px; border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Definition</th>
</tr>
</thead><tbody valign="top">
<tr class="row-even">
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Cumulative</td>
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Increasing over time (instance hours)</td>
</tr>
<tr class="row-odd">
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Gauge</td>
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Discrete items (floating IPs, image uploads)
and fluctuating values (disk I/O)</td>
</tr>
<tr class="row-even">
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Delta</td>
<td style="padding-top: 1px; padding-right: 8px;
padding-bottom: 1px; padding-left: 5px; text-align: left;
border-top-width: 0px; border-top-style: initial;
border-top-color: initial; border-left-width: 0px;
border-left-style: initial; border-left-color: initial;
border-right-width: 0px; border-right-style: initial;
border-right-color: initial; border-bottom-width: 1px;
border-bottom-style: solid; border-bottom-color: rgb(170,
170, 170); ">Changing over time (bandwidth)</td>
</tr>
</tbody>
</table>
<p style="margin-top: 0.8em; margin-right: 0px; margin-bottom:
0.5em; margin-left: 0px; color: rgb(0, 0, 0); font-family:
ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, 'Helvetica Neue',
sans-serif; font-size: 16px; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: 24px; orphans: 2; text-align: left; text-indent:
0px; text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255,
255); ">----------------------------------------------------------------------------------------<br>
</p>
<p style="margin-top: 0.8em; margin-right: 0px; margin-bottom:
0.5em; margin-left: 0px; color: rgb(0, 0, 0); font-family:
ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, 'Helvetica Neue',
sans-serif; font-size: 16px; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: 24px; orphans: 2; text-align: left; text-indent:
0px; text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255,
255); ">Cumulative type is apparent, while even with
descriptions gauge and delta type confuse me.<br>
Could you explain them through examples or by sharing an use
case? <br>
</p>
<br>
Thanks<br>
<br>
<pre wrap="">-----------------------
Yawei Wu
Dalian Hi-Think Computer Technology,Corp.
</pre>
<br>
</div>
<blockquote
cite="mid:1505758973.51174284.1351693389620.JavaMail.root@redhat.com"
type="cite">
<pre wrap="">
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).
Cheers,
Eoghan
[1] <a class="moz-txt-link-freetext" href="https://review.openstack.org/14921">https://review.openstack.org/14921</a>
</pre>
<blockquote type="cite">
<pre wrap="">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.
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</blockquote>
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