ruby calculate execution time

To calculate the execution time of a Ruby program, you can use the Process module's clock_gettime method. This method returns the number of seconds and nanoseconds since an arbitrary starting point, which you can use to measure the elapsed time.

Here are the steps to calculate the execution time in Ruby:

1. First, you need to require the Process module at the beginning of your script:

require 'benchmark'

1. Then, you can start the timer by calling the Process.clock_gettime method with the Process::CLOCK_MONOTONIC constant as the argument. This will return the starting time:

start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)

1. Next, you can execute the code that you want to measure the execution time for:

# Code to measure execution time
# ...

1. After the code execution, you can calculate the elapsed time by subtracting the starting time from the current time. To get the current time, you can call the Process.clock_gettime method again:

end_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
elapsed_time = end_time - start_time

1. Finally, you can print the elapsed time in seconds:

puts "Elapsed time: #{elapsed_time} seconds"

By following these steps, you can calculate the execution time of a Ruby program. The Process.clock_gettime method provides a reliable way to measure the elapsed time, and the Process::CLOCK_MONOTONIC constant ensures that the timer is not affected by system clock adjustments.