brainopia

patch_url=https://raw.github.com/gist/1658360/afd06eec533ad0140011bdaf652e6cd82eedf7ec/cumulative_performance.patch
yaml_url=http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz
ruby_url=http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p0.tar.gz

build_package_falcon_patch() {
  echo 'applying falcon patch'
  curl $patch_url | patch -p1
  build_package_standard $1
}

brainopia

ruby-1.9.3-p0
        3.27 real         2.45 user         0.40 sys
  51400704  maximum resident set size
        2.84 real         2.44 user         0.33 sys
  55898112  maximum resident set size
        2.77 real         2.42 user         0.32 sys
  55369728  maximum resident set size
        2.77 real         2.40 user         0.32 sys
  57630720  maximum resident set size
        3.22 real         2.46 user         0.33 sys

brainopia

ruby-1.9.3-p0
        2.72 real         2.37 user         0.31 sys
  54624256  maximum resident set size
        2.69 real         2.36 user         0.31 sys
  56795136  maximum resident set size
        2.66 real         2.34 user         0.30 sys
  47902720  maximum resident set size
        2.67 real         2.34 user         0.31 sys
  53112832  maximum resident set size
        2.68 real         2.36 user         0.31 sys

brainopia

require 'celluloid'

class Foo
  include Celluloid

  def waiting
    puts 'before wait'
    wait :bar
    puts 'after wait' # is never called, why?
  end

brainopia

require 'benchmark'

module Capistrano::Benchmark
  def self.included(base)
    base.class_eval do
      alias execute_task_without_benchmark execute_task
      alias execute_task execute_task_with_benchmark
    end
  end

brainopia

# позволяет получить процентное соотношение для чисел в массиве
# percents [1,2,3] => [0.16666666666666666, 0.3333333333333333, 0.5]
def percents(numbers)
  total = numbers.inject(:+).to_f
  numbers.map {|it| it / total }
end

# позволяет получить процентное распределение для чисел в массиве
# требуется чтобы генерировать рендомное число с заданными вероятностями
# distribution [1,2,3] => [0.16666666666666666, 0.5, 1.0]

brainopia

module Lock
  extend self
  delegate :connection, :to => ActiveRecord::Base

  def sync(*args)
    lock = Zlib.crc32 args.join
    obtain lock
    yield
  ensure
    release lock

brainopia

def bash_escape(argument)
  "$'" + argument.gsub("\\'", '\\\\\&').gsub("'", "\\\\'") + "'"
end

ruby_code = "puts 'something'"
command = "ruby -e #{bash_escape ruby_code}"
puts "ssh server #{bash_escape command}" # => ssh server $'ruby -e $\'puts \\\'something\\\'\''

brainopia

module Developer
  extend self
  delegate :establish_connection, :clear_all_connections!, :to => ActiveRecord::Base

  def delayed_debug(scope)
    detach_process do
      close_io_objects
      establish_connection
      setup_process_name
      notify_developers

brainopia

def method(variable=((default=true);nil))
  puts "Value: #{variable.inspect}, default argument - #{!!default}"
end

method nil # => Value: nil, default argument - false
method # => Value: nil, default argument - true