Benchmark two types of log tags

proctagbench.rb

#!/usr/bin/env ruby
require 'benchmark'
require 'date'
require 'securerandom'

Benchmark.bm(15) do|b|
  ITERATE = 100_000
  
  timestamp = Proc.new {Time.now.strftime('%Y-%m-%d %H:%M:%S.%L')}
  b.report("proc time call") do
    ITERATE.times { log_tags = [timestamp.call, SecureRandom.hex(16)] }
  end

  emptyproc = Proc.new {nil}
  b.report("proc empty call") do
    ITERATE.times { log_tags = [emptyproc.call, SecureRandom.hex(16)] }
  end
  
  b.report("uuid only") do
    ITERATE.times { log_tags = [SecureRandom.hex(16)] }
  end
end

Results:

                      user     system      total        real
proc call         1.430000   0.010000   1.440000 (  1.520804)
empty proc call   0.430000   0.000000   0.430000 (  0.440742)
uuid only         0.400000   0.000000   0.400000 (  0.405750)