perftools.rb example

perftools example.rb

# log_to_stdout! (useful if you're running this as a script/runner thing)
Object.send(:remove_const, :RAILS_DEFAULT_LOGGER)
Object.const_set(:RAILS_DEFAULT_LOGGER, Logger.new(STDOUT))
ActiveRecord::Base.logger = Rails.logger
Mailman.config.logger = Rails.logger
ActiveRecord::Base.connection_handler.clear_all_connections!

require 'perftools'  # add perftools.rb to your Gemfile

time = Time.now.to_i
bm_data = "/tmp/profile_#{time}.data"
gif = "/tmp/profile_#{time}.gif"

PerfTools::CpuProfiler.start(bm_data) do
  # PROFILED STUFF GOES HERE
end

# don't exec your browser if you are doing this in script/server
system "bundle exec pprof.rb --gif #{bm_data} > #{gif}"
exec "chromium-browser --app=\"file://#{gif}\""