get system cpu usage in ruby

To get the system CPU usage in Ruby, you can use the sys/cpu library that provides a platform-independent way to access and estimate system CPU time usage. Here is a simple example:

main.rb
require 'sys/cpu'

# Get the current CPU usage as a percentage
usage = Sys::CPU::Process.get_cpu_usage * 100
puts "CPU usage: #{usage}%"
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This will print out the current CPU usage as a percentage.

Note that this example uses the get_cpu_usage method from the Sys::CPU::Process class, which returns the CPU time used by the current process as a fraction of the total CPU time available. If you want to get the system-wide CPU usage, you can use the Sys::CPU::Stat::CPU class instead, which provides platform-specific implementations of methods for getting the system CPU usage.