coverband_file_discovery_benchmark.rb

require "benchmark"

@project_directory = File.expand_path(Coverband.configuration.root)

def old_glob
  Dir.glob("#{@project_directory}/app/views/**/*.html.{erb,haml,slim}").map {|filename| filename }
end

def current_glob
  Dir.glob("#{@project_directory}/**/app/views/**/*.html.{erb,haml,slim}").map {|filename| filename }
end

def glob_following_symlink
  Dir.glob("#{@project_directory}/**/*/**/app/views/**/*.html.{erb,haml,slim}").map {|filename| filename }
end

def glob_with_explicit_directories
  Dir.glob("#{@project_directory}/{,components,packs,engines}/*/app/views/**/*.html.{erb,haml,slim}").map {|filename| filename }
end

def find_suggestion
  IO.popen("find #{@project_directory}/ -path '*/app/views/*' \\( -iname \*.html.erb -o -iname \*.html.haml -o -iname \*.html.slim \\)").map { |path| path.chomp }
end

def find_with_symlink
  IO.popen("find -L #{@project_directory}/ -path '*/app/views/*' \\( -iname \*.html.erb -o -iname \*.html.haml -o -iname \*.html.slim \\)").map { |path| path.chomp }
end

n = 25

Benchmark.bm(30) do |bm|
  bm.report("old_glob:") { n.times { old_glob } }
  bm.report("current_glob:") { n.times { current_glob } }
  bm.report("glob_following_symlink:") { n.times { glob_following_symlink } }
  bm.report("glob_with_explicit_directories:") { n.times { glob_with_explicit_directories } }
  bm.report("find:") { n.times { find_suggestion } }
  bm.report("find_with_symlink:") { n.times { find_with_symlink } }
end

n = 25 gave these results:

                                     user     system      total        real
old_glob:                        0.000867   0.002784   0.003651 (  0.003644)
current_glob:                   13.632472 106.514298 120.146770 (297.685225)
glob_following_symlink:         19.345277 197.115923 216.461200 (477.629420)
glob_with_explicit_directories:  0.004886   0.018023   0.022909 (  0.024958)
find:                            0.118630   0.471292   0.589922 (577.058559)
find_with_symlink:               0.118507   0.437860   0.556367 (466.372223)

benchmark to support the issue here: danmayer/coverband#596