<div dir="ltr"><a class="GWVZpf gW" id="IloFPc-0" href="mailto:ydary@redhat.com" tabindex="-1">+Yaniv Dary</a> can you help with a gap analysis to understand what values we expecet as RAW and not supplied by collectd?<br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Mar 13, 2017 at 9:45 AM Francesco Romani <<a href="mailto:fromani@redhat.com">fromani@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="gmail_msg">No updates yet. I'll move forward filing a github issue, hoping
to gather more feedback.<br class="gmail_msg">
</p>
<p class="gmail_msg"><br class="gmail_msg">
</p>
<p class="gmail_msg">Bests,<br class="gmail_msg">
</p></div><div bgcolor="#FFFFFF" text="#000000" class="gmail_msg">
<br class="gmail_msg">
<div class="m_3084647232394532893moz-cite-prefix gmail_msg">On 03/12/2017 03:38 PM, Yaniv Dary
wrote:<br class="gmail_msg">
</div>
<blockquote type="cite" class="gmail_msg">
<div dir="ltr" class="gmail_msg">Any updates on the usage of collectd with rates?</div>
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<pre cols="72" class="gmail_msg"><span style="font-family:arial,helvetica,sans-serif" class="gmail_msg">Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : <a href="tel:+972%209-769-2306" value="+97297692306" class="gmail_msg" target="_blank">+972 (9) 7692306</a>
8272306
Email: <a href="mailto:ydary@redhat.com" class="gmail_msg" target="_blank">ydary@redhat.com</a>
IRC : ydary</span></pre>
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<div class="gmail_quote gmail_msg">On Tue, Feb 28, 2017 at 4:17 PM, Yaniv
Dary <span dir="ltr" class="gmail_msg"><<a href="mailto:ydary@redhat.com" class="gmail_msg" target="_blank">ydary@redhat.com</a>></span>
wrote:<br class="gmail_msg">
<blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div dir="ltr" class="gmail_msg">
<pre cols="72" class="gmail_msg"><span style="font-family:arial,helvetica,sans-serif" class="gmail_msg">Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : <a href="tel:+972%209-769-2306" value="+97297692306" class="gmail_msg" target="_blank">+972 (9) 7692306</a>
8272306
Email: <a href="mailto:ydary@redhat.com" class="gmail_msg" target="_blank">ydary@redhat.com</a>
IRC : ydary</span></pre>
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<div class="m_3084647232394532893h5 gmail_msg">On Tue, Feb 28, 2017 at 4:06 PM,
Francesco Romani <span dir="ltr" class="gmail_msg"><<a href="mailto:fromani@redhat.com" class="gmail_msg" target="_blank">fromani@redhat.com</a>></span>
wrote:<br class="gmail_msg">
<blockquote class="gmail_quote gmail_msg" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="m_3084647232394532893m_7881526957566044995gmail- gmail_msg"><br class="gmail_msg">
On 02/28/2017 12:24 PM, Yaniv Dary wrote:<br class="gmail_msg">
> We need good answers from them to why
they do not support this use case.<br class="gmail_msg">
> Maybe a github issue on the use case
would get more attention. They<br class="gmail_msg">
> should allow us to choose how to present
and collect the data.<br class="gmail_msg">
> Can you open one?<br class="gmail_msg">
><br class="gmail_msg">
<br class="gmail_msg">
</span>I can, and I will if I get no answer in
few more days.<br class="gmail_msg">
Meantime, among other things, I'm doing my
homework to understand why<br class="gmail_msg">
they do like that.<br class="gmail_msg">
<br class="gmail_msg">
This is the best source of information I found
so far (please check the<br class="gmail_msg">
whole thread, it's pretty short):<br class="gmail_msg">
<br class="gmail_msg">
<a href="https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html" rel="noreferrer" class="gmail_msg" target="_blank">https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html</a><br class="gmail_msg">
<br class="gmail_msg">
Quoting part of the email<br class="gmail_msg">
<br class="gmail_msg">
"""<br class="gmail_msg">
<br class="gmail_msg">
We only came up with one use case where having
the raw counter values is<br class="gmail_msg">
beneficial: If you want to calculate the average
rate over arbitrary<br class="gmail_msg">
time spans, it's easier to look up the raw
counter values for those<br class="gmail_msg">
points in time and go from there. However, you
can also sum up the<br class="gmail_msg">
individual rates to reach the same result.
Finally, when handling<br class="gmail_msg">
counter resets / overflows within this interval,
integrating over /<br class="gmail_msg">
summing rates is trivial by comparison.<br class="gmail_msg">
<br class="gmail_msg">
Do you have any other use-case for raw counter
values?<br class="gmail_msg">
<br class="gmail_msg">
Pro:<br class="gmail_msg">
<br class="gmail_msg">
* Handling of values becomes easier.<br class="gmail_msg">
* The rate is calculated only once, in
contrast to potentially several<br class="gmail_msg">
times, which might be more efficient
(currently each rate conversion<br class="gmail_msg">
involves a lookup call).<br class="gmail_msg">
* Together with (1), this removes the need for
having the "types.db",<br class="gmail_msg">
which could be removed then. We were in wild
agreement that this<br class="gmail_msg">
would be a worthwhile goal.<br class="gmail_msg">
</blockquote>
<div class="gmail_msg"><br class="gmail_msg">
</div>
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<div class="gmail_msg">Not for adding units:</div>
<div class="gmail_msg"><a href="https://github.com/collectd/collectd/issues/2047" class="gmail_msg" target="_blank">https://github.com/collectd/collectd/issues/2047</a><br class="gmail_msg">
</div>
<span class="gmail_msg">
<div class="gmail_msg"> </div>
<blockquote class="gmail_quote gmail_msg" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br class="gmail_msg">
Contra:<br class="gmail_msg">
<br class="gmail_msg">
* Original raw value is lost. It can be
reconstructed except for a<br class="gmail_msg">
(more or less) constant offset, though.<br class="gmail_msg">
</blockquote>
<div class="gmail_msg"><br class="gmail_msg">
</div>
</span>
<div class="gmail_msg">How is this done?</div>
<span class="gmail_msg">
<div class="gmail_msg"> </div>
<blockquote class="gmail_quote gmail_msg" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
"""<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
Looks like this change was intentional and
implemented after some<br class="gmail_msg">
discussion.<br class="gmail_msg">
</blockquote>
<div class="gmail_msg"><br class="gmail_msg">
</div>
</span>
<div class="gmail_msg">I understand this, but most monitoring system
will not know what to do with this value.</div>
<span class="gmail_msg">
<div class="gmail_msg"> </div>
<blockquote class="gmail_quote gmail_msg" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br class="gmail_msg">
Bests,<br class="gmail_msg">
<div class="m_3084647232394532893m_7881526957566044995gmail-HOEnZb gmail_msg">
<div class="m_3084647232394532893m_7881526957566044995gmail-h5 gmail_msg"><br class="gmail_msg">
--<br class="gmail_msg">
Francesco Romani<br class="gmail_msg">
Red Hat Engineering Virtualization R & D<br class="gmail_msg">
IRC: fromani<br class="gmail_msg">
<br class="gmail_msg">
</div>
</div>
</blockquote>
</span></div>
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<pre class="m_3084647232394532893moz-signature gmail_msg" cols="72">--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani</pre>
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