<div dir="ltr"><div><div><div><div>Hi Don,<br><br></div>Thanks for your answer. <br></div>I'm extending OpenStack (in context with my Bachelor Thesis) to track hardware information such as CPU temperature. Among other things I extended resource_tracker.py. I only wanted to increase this interval for testing purpose. I'm aware of the costs and maybe have to move my code for these hardware information updates so that they are independent from the (free) resource tracking.<br>
<br></div>Thanks,<br><br></div>Kai<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-07-01 1:40 GMT+02:00 Dugger, Donald D <span dir="ltr"><<a href="mailto:donald.d.dugger@intel.com" target="_blank">donald.d.dugger@intel.com</a>></span>:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Kai-<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Looking at the code the 60 second interval is hard coded and not changeable via a config parameter.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Having said that, and given that it’s a fairly expensive operation to update the DB for `every` compute node in the system, maybe the better question is why
do you want to increase the update frequency? Do you really expect to be creating/deleting instances so fast on a single node that a 60 second latency in the update of the stats is really a problem?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Don Dugger<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">"Censeo Toto nos in Kansa esse decisse." - D. Gale<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ph: <a href="tel:303%2F443-3786" value="+13034433786" target="_blank">303/443-3786</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Kai Brennenstuhl [mailto:<a href="mailto:kai.brennenstuhl@gmail.com" target="_blank">kai.brennenstuhl@gmail.com</a>]
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<b>Sent:</b> Thursday, June 26, 2014 6:56 AM<br>
<b>To:</b> <a href="mailto:openstack@lists.openstack.org" target="_blank">openstack@lists.openstack.org</a></span></p><div class=""><br>
<b>Subject:</b> [Openstack] [openstack][nova] Compute node update interval<u></u><u></u></div><p></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hi,</p><div><div class="h5"><br>
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how can I specify the interval in which the (free) resources of my compute nodes are updated and written into the DB?<u></u><u></u></div></div><p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I looked into nova.conf doc and already changed the following attributes:<u></u><u></u></p>
<pre><code>heal_instance_info_cache_interval = 20<u></u><u></u></code></pre>
<pre><code>service_down_time = 20<u></u><u></u></code></pre>
<pre><code>periodic_fuzzy_delay = 20<u></u><u></u></code></pre>
<pre><code>qpid_heartbeat = 20<u></u><u></u></code></pre>
<pre><code>scheduler_driver_task_period = 20<u></u><u></u></code></pre>
<pre><code><u></u> <u></u></code></pre>
<pre><code>call_timeout = 20<u></u><u></u></code></pre>
<pre><code>db_check_interval = 20</code><u></u><u></u></pre>
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</div></div></div><div><div class="h5">
<p class="MsoNormal">But the update interval in which the resources are written into the database still is about one minute.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Which parameters should I change? Or is this configuration done somewhere else than in nova.conf?<br>
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<u></u><u></u></p>
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<p class="MsoNormal">Kind regards<br>
Kai<u></u><u></u></p>
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