Redmine

Mischa The Evil wrote:

• re-implement performance optimizations of #26055

I wrote another version of Redmine::SyntaxHighlighting::Rouge.language_supported? that implements the optimization of #26055, but I found that the current implementation is twice faster.

The code that implements the optimizations of #26055:

diff --git a/lib/redmine/syntax_highlighting.rb b/lib/redmine/syntax_highlighting.rb
index 731c4eaec..9424eec03 100644
--- a/lib/redmine/syntax_highlighting.rb
+++ b/lib/redmine/syntax_highlighting.rb
@@ -82,6 +82,13 @@ module Redmine
       end

       class << self
+        def self.retrieve_supported_languages
+          (::Rouge::Lexer.all.map(&:tag) + ::Rouge::Lexer.all.map(&:aliases).flatten).uniq.map(&:downcase)
+        end
+        private_class_method :retrieve_supported_languages
+
+        SUPPORTED_LANGUAGES = retrieve_supported_languages.sort
+
         # Highlights +text+ as the content of +filename+
         # Should not return line numbers nor outer pre tag
         def highlight_by_filename(text, filename)
@@ -109,6 +116,10 @@ module Redmine
           find_lexer(language.to_s.downcase) ? true : false
         end

+        def language_supported_const?(language)
+          SUPPORTED_LANGUAGES.bsearch {|e| language <=> e}
+        end
+
         def filename_supported?(filename)
           !::Rouge::Lexer.guesses(:filename => filename).empty?
         end

Benchmark script:

require 'benchmark/ips'

languages = %w(abap lua zsh)

Benchmark.ips do |bench|
  bench.report('language_supported?') do
    Redmine::SyntaxHighlighting::Rouge.language_supported?(languages.sample)
  end

  bench.report('language_supported_const?') do
    Redmine::SyntaxHighlighting::Rouge.language_supported_const?(languages.sample)
  end

  bench.compare!
end

Result:

Warming up --------------------------------------                                   
 language_supported?   244.405k i/100ms                                             
language_supported_const?                                                           
                       122.629k i/100ms                                             
Calculating -------------------------------------                                   
 language_supported?      2.445M (± 2.3%) i/s -     12.465M in   5.100127s          
language_supported_const?                                                           
                          1.215M (± 2.5%) i/s -      6.131M in   5.050739s          

Comparison:                                                                         
 language_supported?:  2445257.6 i/s
language_supported_const?:  1214719.1 i/s - 2.01x  (± 0.00) slower