title: Tools to collect server information during load testing
body: <p>I will be performing a distributed load test using JMeter.  I am using the JMeter extras plugin to output some nice graphs but all of these graphs have to do with response times, response latency, throughput, etc.  I want to also measure CPU, memory used/free, disk usage/latency, and network utilization, maybe some others.  </p>
  
  <p>I will be testing a web application that is running on Ubuntu 14.04.</p>
  
  <p>What tools or commands can I use to gather these stats at various points during the load test and either output the raw data or averages?</p>
  
  <p>Thank you for any information you can provide.</p>