1059 j:~ j$ cat hashtest.rb
#!/usr/bin/env ruby
# encoding: utf-8

require 'benchmark'

Benchmark.bm do |b|
	b.report('Sym: ') do
		hash = {}
		10_000_000.times { hash[:one] = :foo }
	end

	b.report('Str: ') do
		hash = {}
		10_000_000.times { hash['one'] = :foo }
	end
end
1059 j:~ j$ ./hashtest.rb
      user     system      total        real
Sym:   6.130000   0.010000   6.140000 (  6.149491)
Str:   9.770000   0.020000   9.790000 (  9.810211)
1100 j:~ j$