title: AWS EC2 100% CPU utilization
body: <p>I try to host my product to AWS EC2 service and I faced with a problem.</p>
  
  <p>My service is a Node.js app. It do some CPU intensive initialization after start. It stucks after about a 30 sec of work any time I started it. I added detailed logs of the app execution and according them looks like app is totally hung on. However CPU usage is 100%.</p>
  
  <p>I've tried to run the app on many different types of instances. The last try is running on <code>c5n.xlarge</code> instance. OS is Ubuntu 18.04. In all cases my app is stuck. Meanwhile, my app perfectly works on Heroku Free and Hobby dynos (<a href="https://www.heroku.com/pricing" rel="nofollow noreferrer">https://www.heroku.com/pricing</a>) and on my local PC with Core i5-3450 CPU.</p>
  
  <p>What the problem might be?</p>