title: Node.JS built in cluster or PM2 clustering?
body: <p>Which one is better?</p>
  <p>I have activated Nodejs clustering mode with workers but now I discovered PM2 that does the same thing.
  I'm using keymetrics to see the stats from my webserver and I have noticed that when I launch my NodeJS node (with a built in cluster) without using PM2 cluster feature, Keymetrics reports 20/30MB of Ram used.</p>
  <p>If I deactivate clustering (inside node) and I switch on PM2 cluster, keymetrics reports about 300MB of Ram usage.</p>
  <p>Now, which method is better and why with a built in cluster keymetrics reports only 30MB of ram usage?</p>