Find the slowest queries lines in a rails development log

Slow queries

file=''

slow = []
File.readlines(file).each do |line|
  if line =~ /Load\ \(([\d\.]*)ms\)/
    time = $1.to_f
    if time >= 500.0
      slow << [time, line]
    end
  end
end

puts slow.length
slow = slow.sort()
myfile = File.new("slowest.txt", "w+")
puts slow.length
slow.each {|line| myfile.puts("#{line[0]} - #{line[1]}")}
myfile.close