It's a memory using comparison between different stores implementations. To run at your own computer make sure you're in a environment with access to time tool.

Use sh run.sh to see complete results.

file	real	user	sys	maximum resident set size
memory_a.rb	1.52	2.76	0.16	106409984
memory_b.rb	1.84	3.11	0.13	94859264
memory_c.rb	1.66	3.26	0.16	95125504
memory_d.rb	1.58	2.99	0.13	95064064
memory_e.rb	1.45	2.69	0.11	94691328
memory_f.rb	1.50	2.81	0.11	94236672

These time was collected in my Macbook Pro i5  using jruby-1.7.3.