From: Tamara Temple <tamouse.lists@...>
Date: 2013-06-29T11:21:20+09:00
Subject: Re: Best practice to use Enumerable#Sort and Enumerable#Sort_by

Love U Ruby <lists@ruby-forum.com> wrote:
> Thanks for your feed back. Why #sort_by here is faster?
> 
>                  user     system      total        real
> Sort         0.000000   0.000000   0.000000 (  0.000041)
> Sort by      0.000000   0.000000   0.000000 (  0.000019)

You can't go by real time -- you system could have been doing something
else during the time you ran each benchmark. Notice all the other values
register zero, which means there wasn't enough time spent in any of them
to make a meaningful benchmark. Run each of your tests 10,000 times,
then see how they compare. (Note: you may still end up with one being
slower than the other; I don't know. I'm just saying your current
benchmarking is not meaningful enough to make a determination.)