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<p class="MsoNormal">If it’s the same two cores, it might be another process that uses the same two cores and thus happens to max out.<o:p></o:p></p>
<p class="MsoNormal">One very likely possibility would be interrupts from e.g. networking. You can check /proc/interrupts to see where interrupts from the network happens.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">nginx <nginx-bounces@nginx.org> on behalf of Raffael Vogler <raffael.vogler@yieldlove.com><br>
<b>Reply-To: </b>"nginx@nginx.org" <nginx@nginx.org><br>
<b>Date: </b>Thursday, 11 January 2018 at 11.14<br>
<b>To: </b>"nginx@nginx.org" <nginx@nginx.org><br>
<b>Subject: </b>2 of 16 cores are constantly maxing out - how to balance the load?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Hello!<br>
<br>
I have nginx with php-fpm running on a 16 core Ubuntu 16.04 instance. The server is handling more than 10 million requests per hour.<br>
<br>
<a href="https://imgur.com/a/iRZ7V">https://imgur.com/a/iRZ7V</a><o:p></o:p></p>
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<p style="margin-left:36.0pt">As you can see on the htop screenshot cores 6 and 7 are maxed out and that's the case constantly - even after restarting nginx those two cores stay at that level.
<o:p></o:p></p>
<p style="margin-left:36.0pt">I wonder why is that so and how to balance the load more evenly?<o:p></o:p></p>
<p style="margin-left:36.0pt">Also I'm curious to know whether this might indicate a performance relevant issue or if it is most likely harmless and just looks odd.<o:p></o:p></p>
<pre style="margin-left:36.0pt"><code>> cat /etc/nginx/nginx.conf | grep -v '^\s*#'<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code><o:p> </o:p></code></pre>
<pre style="margin-left:36.0pt"><code>user www-data;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>worker_processes auto;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>pid /run/nginx.pid;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>events {<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> worker_connections 768;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>}<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>http {<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> sendfile on;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> tcp_nopush on;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> tcp_nodelay on;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> keepalive_timeout 65;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> types_hash_max_size 2048;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> include /etc/nginx/mime.types;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> default_type application/octet-stream;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> ssl_prefer_server_ciphers on;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> access_log /var/log/nginx/access.log;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> error_log /var/log/nginx/error.log;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> gzip on;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> gzip_disable "msie6";<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> include /etc/nginx/conf.d/*.conf;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code> include /etc/nginx/sites-enabled/*;<o:p></o:p></code></pre>
<pre style="margin-left:36.0pt"><code>}</code><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><code><span style="font-family:"Arial",sans-serif">Thanks</span></code><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><code><span style="font-family:"Arial",sans-serif">Raffael</span></code><o:p></o:p></pre>
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