Monitoring RAM performance

To monitor RAM performance, I am only interested in a couple of metrics, not all the memory-related ones. Take a look at this list:

• mem.util.used

• mem.util.free

• mem.util.bufmem

• mem.util.cached

• swap.free

• swap.used

• swap.pagesin

• swap.pagesout

How to do it…

This recipe will explain you how to create text-based and graphical outputs:

1. First, display live data for the preceding metrics through this command:

   ~]# pmdumptext -H -t 1 -i -l mem.util.used mem.util.free mem.util.bufmem mem.util.cached swap.free swap.used swap.pagesin swap.pagesout -h guest.example.com
   

   

2. Create a configuration file for pmchart to display live data called memory.conf with the following contents:

   #kmchart
   version 1
   
   chart style stacking
           plot color #ffff00 metric mem.util.used
           plot color #ee82ee metric mem.util.free
   chart style stacking
           plot color #ffff00 metric swap.used
           plot color #0000ff metric swap.free
   chart style plot antialiasing off
           plot color #19ff00...