file.rb

def foo(*args) 
  args
end

require "benchmark"

TESTS = 1_000_000
Benchmark.bmbm do |results|
  results.report("hash:") { TESTS.times { foo(:foo => 'bar') } }
  results.report("2 args:") { TESTS.times { foo(:foo, 'bar') } }
end

#
# 
# 
# output:
# 
# 
# 
# Rehearsal -------------------------------------------
# hash:     2.470000   0.060000   2.530000 (  2.559726)
# 2 args:   1.190000   0.010000   1.200000 (  1.225796)
# ---------------------------------- total: 3.730000sec
# 
#               user     system      total        real
# hash:     2.500000   0.060000   2.560000 (  2.628864)
# 2 args:   1.200000   0.010000   1.210000 (  1.205671)
# copy output
# Program exited with code #0 after 7.68 seconds.
#
#
#