System administrators familiar with the Linux operating system
use the tools in the 'procps' toolset all the time. Tools which
read from /proc include top, iostat, vmstat, sar and others. The
files in /proc contain useful information about the performance
of the system. Most of the files are documented in the Linux kernel documentation. You can also check
man 5 proc.
Most performance monitoring tools invoke other tools like iostat to collect performance information instead of reading from the /proc filesytem itself. This begs the question, what can you do if you don't have …