This is a multi-part message in MIME format. --------------A2FDAF300209D96688B3E8CC Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit On 02/26/2017 03:13 PM, Yaniv Dary wrote:
2. collectd *intentionally* report metrics as rates, not as absolute values as Vdsm does. This may be one issue in presence of restarts/data loss in the link between collectd and the metrics store.
How does this work? If we want to show memory usage over time for example, we need to have the usage, not the rate. How would this be reported?
I was imprecise, my fault.
Let me retry: collectd intentionally report quite a lot of metrics we care about as rates, not as absolute values. Memory is actually ok fine.
a0/virt/disk_octets-hdc -> rate a0/virt/disk_octets-vda a0/virt/disk_ops-hdc -> rate a0/virt/disk_ops-vda a0/virt/disk_time-hdc -> rate a0/virt/disk_time-vda a0/virt/if_dropped-vnet0 -> rate a0/virt/if_errors-vnet0 -> rate a0/virt/if_octets-vnet0 -> rate a0/virt/if_packets-vnet0 -> rate a0/virt/memory-actual_balloon -> absolute a0/virt/memory-rss -> absolute a0/virt/memory-total -> absolute a0/virt/ps_cputime -> rate a0/virt/total_requests-flush-hdc -> rate a0/virt/total_requests-flush-vda a0/virt/total_time_in_ms-flush-hdc -> rate a0/virt/total_time_in_ms-flush-vda a0/virt/virt_cpu_total -> rate a0/virt/virt_vcpu-0 -> rate a0/virt/virt_vcpu-1
collectd "just" reports the changes since the last sampling. I'm not sure which is the best way to handle that; I've sent a mail to collectd list some time ago, no answer so far.
Can you CC on that thread? I don't know how ES would work with rates at all. I want to be able to show CPU usage over time and I need to know if its 80% or 10%.
Thanks to the awkward gmail interface I can't reply to myself and CC other people, but I can share the link: https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html -- Francesco Romani Red Hat Engineering Virtualization R & D IRC: fromani --------------A2FDAF300209D96688B3E8CC Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit <html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <br> <div class="moz-cite-prefix">On 02/26/2017 03:13 PM, Yaniv Dary wrote:<br> </div> <blockquote cite="mid:CACKMAy_kfX=LCNe+7EFD2Cjw_Wit+aDS8FR+RPKEo=cMXU+H+A@mail.gmail.com" type="cite"> <div dir="ltr"><br> <div class="gmail_extra"> <div class="gmail_quote"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div bgcolor="#FFFFFF" text="#000000"> <div> <div class="h5"> <blockquote type="cite"> <div dir="auto"> <div> <div class="gmail_extra"> <div class="gmail_quote"> <blockquote class="m_-684850395146887592quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> 2. collectd *intentionally* report metrics as rates, not as absolute<br> values as Vdsm does. This may be one issue in presence of restarts/data<br> loss in the link between collectd and the metrics store.<br> </blockquote> </div> </div> </div> <div dir="auto"><br> </div> <div dir="auto">How does this work? </div> <div dir="auto">If we want to show memory usage over time for example, we need to have the usage, not the rate. </div> <div dir="auto">How would this be reported? <br> </div> </div> </blockquote> <br> </div> </div> I was imprecise, my fault.<br> <br> Let me retry:<br> collectd intentionally report quite a lot of metrics we care about as rates, not as absolute values.<br> Memory is actually ok fine.<br> <br> a0/virt/disk_octets-hdc -> rate<br> a0/virt/disk_octets-vda<br> a0/virt/disk_ops-hdc -> rate<br> a0/virt/disk_ops-vda<br> a0/virt/disk_time-hdc -> rate<br> a0/virt/disk_time-vda<br> a0/virt/if_dropped-vnet0 -> rate<br> a0/virt/if_errors-vnet0 -> rate<br> a0/virt/if_octets-vnet0 -> rate<br> a0/virt/if_packets-vnet0 -> rate<br> a0/virt/memory-actual_balloon -> absolute<br> a0/virt/memory-rss -> absolute<br> a0/virt/memory-total -> absolute<br> a0/virt/ps_cputime -> rate<br> a0/virt/total_requests-flush-<wbr>hdc -> rate<br> a0/virt/total_requests-flush-<wbr>vda<br> a0/virt/total_time_in_ms-<wbr>flush-hdc -> rate<br> a0/virt/total_time_in_ms-<wbr>flush-vda<br> a0/virt/virt_cpu_total -> rate<br> a0/virt/virt_vcpu-0 -> rate<br> a0/virt/virt_vcpu-1<br> <br> collectd "just" reports the changes since the last sampling. I'm not sure which is the best way to handle that; I've sent a mail to collectd list some time ago, no answer so far.</div> </blockquote> <div><br> </div> <div>Can you CC on that thread?</div> <div>I don't know how ES would work with rates at all. </div> <div>I want to be able to show CPU usage over time and I need to know if its 80% or 10%.</div> <br> </div> </div> </div> </blockquote> <br> Thanks to the awkward gmail interface I can't reply to myself and CC other people, but I can share the link:<br> <br> <a class="moz-txt-link-freetext" href="https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html">https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html</a><br> <br> <pre class="moz-signature" cols="72">-- Francesco Romani Red Hat Engineering Virtualization R & D IRC: fromani</pre> </body> </html> --------------A2FDAF300209D96688B3E8CC--