Optimize Ruby Code With StackProf And Speedscope

Include stackprof in gemfile

gem "stackprof", ">= 0.2.26", require: false

    
    

    
    




Require stackprof and run slow code in its block

require "stackprof"
def profile!
  profile =
    StackProf.run(ignore_gc: true, interval: 1000, mode: :wall, raw: true) do
      @value = # slow code
    end
  output_file = Rails.root.join("log/stackprof.json")  
  File.write(output_file, JSON.generate(profile))
  @value # return the original  
end
profile!

    
    

    
    




DL the file to local computer

scp PROD:/path/to/log/stackprof.json ~/Desktop/profile.json...