The advice given by VMWare about this is "Don't trust metrics measured from within the VM". I have seen a single process showing up as using 9999% CPU in top from within a VM. From these metrics, we can easily see what is going on for our Linux systems. This is a very good indicator of how slow your system will feel to use.Īnother note on CPU utilisation, virtual machines can dynamically alter the CPU capacity in response to the needs of the VM. Using the linux top monitoring command, we can view the running status of the system in real time, including CPU usage. network metrics: Yes, these beautiful charts are generated by Grafana/InfluxDB/Telegraf. This is an indication of how many processes are currently waiting to get on a processor. The other key metric to watch is the "load average". Bear in mind that 25 Apache processes using 10% CPU each shows up differently in top to a single MySQL process using 250% CPU. For that, top or htop at the time is your best bet.
Generally, these will not tell you which process was using all the CPU at any given time. Once you install one of them, you will have trouble remembering how you lived without it. (Although Nagios can do graphing, this is not its forte.) There are plenty of questions on ServerFault already about which monitoring system is the best. The simplest way to access them is to type sar on the command line.Ī far better option is to install a monitoring system such as Cacti, Munin or Zabbix. The sar utility collects some statistics about your system if it is switched on.
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