Use stackprof for profiling.

performance/profile.rb

@@ -1,19 +1,12 @@
-require 'rubygems'
-require 'ruby-prof' rescue fail("install ruby-prof extension/gem")
+require 'stackprof' rescue fail("install stackprof extension/gem")
 require File.dirname(__FILE__) + '/theme_runner'
 
 profiler = ThemeRunner.new
-
-puts 'Running profiler...'
-
-results  = profiler.run_profile
-
-puts 'Success'
-puts
-
-[RubyProf::FlatPrinter, RubyProf::GraphHtmlPrinter, RubyProf::CallTreePrinter, RubyProf::DotPrinter].each do |klass|
-  filename = (ENV['TMP'] || '/tmp') + (klass.name.include?('Html') ? "/liquid.#{klass.name.downcase}.html" : "/callgrind.liquid.#{klass.name.downcase}.txt")
-  filename.gsub!(/:+/, '_')
-  File.open(filename, "w+") { |fp| klass.new(results).print(fp, :print_file => true, :min_percent => 3) }
-  $stderr.puts "wrote #{klass.name} output to #{filename}"
+profiler.run
+results = StackProf.run(mode: :cpu) do
+  100.times do
+    profiler.run
+  end
 end
+StackProf::Report.new(results).print_text(false, 20)
+File.write(ENV['FILENAME'], Marshal.dump(results)) if ENV['FILENAME']