Test script to profile requests with GC options in case you have only access into the console.

requests.rb

# Test script to profile requests with GC options in case you have only access into the console.
#
# Invoke the script in the staging/production console:
#
#   RAILS_ENV=production rails console
#   [1] pry(main)> load '/path/to/the-file/requests.rb'
#
# You will see benchmark results per link for analyzing.
#
# You should run it before and after changing GC options for comparison.
# For example you can start from these options for REE:
#
#   RUBY_HEAP_MIN_SLOTS=600000
#   RUBY_GC_MALLOC_LIMIT=59000000
#   RUBY_HEAP_FREE_MIN=100000
#
# These options should be set up as environment variables before you run the console.
 
require 'benchmark'
 
# Test links
links = [
  '/first-page',
  '/second-page',
  '/third-page'
]
 
# Turn off logs
ActiveRecord::Base.logger = ::Logger.new('/dev/null')
ActionController::Base.logger = ::Logger.new('/dev/null')
 
# Test provided links
links.each do |link|
  status = app.get(link)
  unless ([200, 201, 202].include? status)
    raise "Some errors on the provided link '#{link}': \n\n#{app.body}"
  end
end
 
# Run the benchmark
n = 10
results = Benchmark.bm(50) do |x|
  links.each do |link|
    label = "#{link}:".last(40)
 
    x.report(label) do
      n.times { app.get(link) }
    end
  end
end
 
p results