eregon

#!/usr/bin/env ruby

class Stats
  def initialize(data)
    @data = data
    @sorted = data.sort
  end

  def size
    @data.size

eregon

Name	Written in	Usable in	API and notes
CRuby parse.y	C	usable from C (maybe)	no official API, not easily reusable/not standalone
Ripper	C	Ruby	awkward API
RubyVM::AbstractSyntaxTree	C	Ruby	awkward API, not portable API
whitequark/parser	Ruby	Ruby	Nice API
ruby_parser	Ruby	Ruby	up-to-date?
lib-ruby-parser	Rust	C/C++/Ruby (see bindings
natalie_parser	C++	C++/C
JRuby's parser	Java	Java	depends on quite a few JRuby internals

eregon

def Process.rss
  Integer(`ps -o rss= -p #{Process.pid}`) * 1024
end

def mb(bytes)
  return '?' if bytes == nil or bytes < 0
  mb = bytes / 1024.0 / 1024.0
  "#{mb.to_i} MB"
end

eregon

immutable = deeply frozen

Immutable classes

Immutable core classes

• TrueClass
• FalseClass
• NilClass
• Integer

eregon

command = ARGV
start = Process.clock_gettime Process::CLOCK_MONOTONIC, :millisecond

IO.popen(command, err: [:child, :out]) do |io|
  while line = io.gets
    now = Process.clock_gettime Process::CLOCK_MONOTONIC, :millisecond
    puts "[#{"%5d" % (now - start)}] #{line}"
  end
end

eregon

require 'tmpdir'
require 'rbconfig'

def inline_c_extension(c_code)
  Dir.mktmpdir('inline_c_extension') do |dir|
    File.write("#{dir}/cext.c", c_code)
    File.write("#{dir}/extconf.rb", <<~RUBY)
    require 'mkmf'
    create_makefile('cext')
    RUBY

eregon

Ruby Implementation	Speedup relative to 2.7.2
Ruby 2.7.2	1.00x
Ruby 2.7.2 --jit	1.16x
Ruby 3 dev	0.81x
Ruby 3 dev --jit	1.08x
TruffleRuby CE 20.2 --jvm	19.73x
TruffleRuby EE 20.2 --jvm	31.54x

The median i/s result out of 3 is used to compute speedups.

eregon

Ruby	Core methods written in Ruby	Total number of core methods	% written in Ruby
CRuby 2.3	3	1637	0.2%
CRuby 2.4	3	1636	0.2%
CRuby 2.5	6	1680	0.4%
CRuby 2.6	5	1767	0.3%
CRuby 2.7	38	1802	2.1%
CRuby 3.0	89	1830	4.9%
CRuby 3.1	112	1884	5.9%
CRuby 3.2	128	1924	6.7%

eregon

I added `x.compare!` in bin/benchmark

$ cd ext
$ rake
$ cd ..

$ gem install ffi-compiler benchmark-ips
$ ruby -Ilib bin/benchmark

ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-linux]

eregon

#!/usr/bin/env ruby

private def benchmark(name = nil, &block)
  raise "needs a block" unless block
  binding = block.binding

  file, line = block.source_location
  start_line = line - 1
  lines = File.readlines(file)
  indent = lines.fetch(start_line)[/^(\s+)/, 1]