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![Ryuta Kamizono](/assets/img/avatar_default.png)
We sometimes say "✂️ newline after `private`" in a code review (e.g. https://github.com/rails/rails/pull/18546#discussion_r23188776, https://github.com/rails/rails/pull/34832#discussion_r244847195). Now `Layout/EmptyLinesAroundAccessModifier` cop have new enforced style `EnforcedStyle: only_before` (https://github.com/rubocop-hq/rubocop/pull/7059). That cop and enforced style will reduce the our code review cost.
137 lines
4.4 KiB
Bash
Executable file
137 lines
4.4 KiB
Bash
Executable file
#!/usr/bin/env ruby
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# frozen_string_literal: true
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# Profile require calls giving information about the time and the files that are called
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# when loading the provided file.
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#
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# Example:
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# tools/profile activesupport/lib/active_support.rb [ruby-prof mode] [ruby-prof printer]
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ENV["NO_RELOAD"] ||= "1"
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ENV["RAILS_ENV"] ||= "development"
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module CodeTools
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class Profiler
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Error = Class.new(StandardError)
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attr_reader :path, :mode
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def initialize(path, mode = nil)
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assert_ruby_file_exists(path)
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@path, @mode = path, mode
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require "benchmark"
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end
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def profile_requires
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GC.start
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before_rss = `ps -o rss= -p #{Process.pid}`.to_i
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if mode
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require "ruby-prof"
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RubyProf.measure_mode = RubyProf.const_get(mode.upcase)
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RubyProf.start
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else
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Object.instance_eval { include RequireProfiler }
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end
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elapsed = Benchmark.realtime { require path }
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results = RubyProf.stop if mode
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GC.start
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after_rss = `ps -o rss= -p #{Process.pid}`.to_i
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if mode
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if printer = ARGV.shift
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puts "RubyProf outputting to stderr with printer #{printer}"
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RubyProf.const_get("#{printer.to_s.classify}Printer").new(results).print($stdout)
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elsif RubyProf.const_defined?(:CallStackPrinter)
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filename = "#{File.basename(path, '.rb')}.#{mode}.html"
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puts "RubyProf outputting to #{filename}"
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File.open(filename, "w") do |out|
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RubyProf::CallStackPrinter.new(results).print(out)
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end
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else
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filename = "#{File.basename(path, '.rb')}.#{mode}.callgrind"
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puts "RubyProf outputting to #{filename}"
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File.open(filename, "w") do |out|
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RubyProf::CallTreePrinter.new(results).print(out)
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end
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end
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end
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RequireProfiler.stats.each do |file, depth, sec|
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if sec
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puts "%8.1f ms %s%s" % [sec * 1000, " " * depth, file]
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else
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puts "#{' ' * (13 + depth)}#{file}"
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end
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end
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puts "%8.1f ms %d KB RSS" % [elapsed * 1000, after_rss - before_rss]
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end
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private
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def assert_ruby_file_exists(path)
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fail Error.new("No such file") unless File.exist?(path)
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fail Error.new("#{path} is a directory") if File.directory?(path)
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ruby_extension = File.extname(path) == ".rb"
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ruby_executable = File.open(path, "rb") { |f| f.readline } =~ [/\A#!.*ruby/]
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fail Error.new("Not a ruby file") unless ruby_extension || ruby_executable
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end
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module RequireProfiler
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private
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def require(file, *args) RequireProfiler.profile(file) { super } end
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def load(file, *args) RequireProfiler.profile(file) { super } end
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@depth, @stats = 0, []
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class << self
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attr_accessor :depth
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attr_accessor :stats
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def profile(file)
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stats << [file, depth]
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self.depth += 1
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result = nil
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elapsed = Benchmark.realtime { result = yield }
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self.depth -= 1
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stats.pop if stats.last.first == file
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stats << [file, depth, elapsed] if result
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result
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end
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end
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end
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end
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end
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# ruby-prof printer name causes the third arg to be sent :classify
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# which is probably overkill if you already know the name of the ruby-prof
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# printer you want to use, e.g. Graph
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begin
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require "active_support/inflector"
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require "active_support/core_ext/string/inflections"
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rescue LoadError
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STDERR.puts $!.message
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class String
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# File activesupport/lib/active_support/inflector/methods.rb, line 150
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def classify
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# strip out any leading schema name
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camelize(sub(/.*\./, ""))
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end
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# File activesupport/lib/active_support/inflector/methods.rb, line 68
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def camelize(uppercase_first_letter = true)
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string = self
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if uppercase_first_letter
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string = string.sub(/^[a-z\d]*/) { |match| match.capitalize }
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else
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string = string.sub(/^(?:(?=\b|[A-Z_])|\w)/) { |match| match.downcase }
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end
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string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub("/", "::")
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end
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end
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end
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if $0 == __FILE__
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if (filename = ARGV.shift)
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path = File.expand_path(filename)
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mode = ARGV.shift
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CodeTools::Profiler.new(path, mode).profile_requires
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else
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STDERR.puts "No file path entered. Usage is tools/profile path/to/file.rb [ruby-prof mode] [ruby-prof printer]"
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end
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end
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