<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Mar 17, 2017 at 1:58 PM, Sean Dague <span dir="ltr"><<a href="mailto:sean@dague.net" target="_blank">sean@dague.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 03/17/2017 08:27 AM, Jordan Pittier wrote:<br>
> The patch that reduced the number of Tempest Scenarios we run in every<br>
> job and also reduce the test run concurrency [0] was merged 13 days ago.<br>
> Since, the situation (i.e the high number of false negative job results)<br>
> has not improved significantly. We need to keep looking collectively at<br>
> this.<br>
<br>
</span>While the situation hasn't completely cleared out -<br>
<a href="http://tinyurl.com/mdmdxlk" rel="noreferrer" target="_blank">http://tinyurl.com/mdmdxlk</a> - since we've merged this we've not seen that<br>
job go over 25% failure rate in the gate, which it was regularly<br>
crossing in the prior 2 week period. That does feel like progress. In<br>
spot checking I we are also rarely failing in scenario tests now, but<br>
the fails tend to end up inside heavy API tests running in parallel.<br></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span class=""><br>
> There seems to be an agreement that we are hitting some memory limit.<br>
> Several of our most frequent failures are memory related [1]. So we<br>
> should either reduce our memory usage or ask for bigger VMs, with more<br>
> than 8GB of RAM.<br>
><br>
> There was/is several attempts to reduce our memory usage, by reducing<br>
> the Mysql memory consumption ([2] but quickly reverted [3]), reducing<br>
> the number of Apache workers ([4], [5]), more apache2 tuning [6]. If you<br>
> have any crazy idea to help in this regard, please help. This is high<br>
> priority for the whole openstack project, because it's plaguing many<br>
> projects.<br>
<br>
</span>Interesting, I hadn't seen the revert. It is also curious that it was<br>
largely limitted to the neutron-api test job. It's also notable that the<br>
sort buffers seem to have been set to the minimum allowed limit of mysql<br>
-<br>
<a href="https://dev.mysql.com/doc/refman/5.6/en/innodb-parameters.html#sysvar_innodb_sort_buffer_size" rel="noreferrer" target="_blank">https://dev.mysql.com/doc/<wbr>refman/5.6/en/innodb-<wbr>parameters.html#sysvar_innodb_<wbr>sort_buffer_size</a><br>
- and is over an order of magnitude decrease from the existing default.<br>
<br>
I wonder about redoing the change with everything except it and seeing<br>
how that impacts the neutron-api job.<br></blockquote><div>Yes, that would be great because mysql is by far our biggest memory consumer so we should target this first. <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span class="HOEnZb"><font color="#888888"><br>
-Sean<br>
<br>
--<br>
Sean Dague<br>
<a href="http://dague.net" rel="noreferrer" target="_blank">http://dague.net</a><br>
</font></span><div class="HOEnZb"><div class="h5"><br>
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