From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-01-13T21:55:43+09:00
Subject: Re: Why {} is much faster than Hash.new ?

2011/1/13 Jonas Pfenniger (zimbatm) <jonas@pfenniger.name>:
> I think it's the cost of the method call with options parsing.
>
> Benchmark.realtime do 1_000_000.times do @m = Hash.new end end
>  => 1.1976041793823242
>
> def blank_method; end
> Benchmark.realtime do 1_000_000.times do @m = blank_method end end
>  => 0.1965808868408203
>
> Benchmark.realtime do 1_000_000.times do @m = {} end end
>  => 0.2893531322479248
>
> Benchmark.realtime do 1_000_000.times do @m = Hash.allocate end end
>  => 0.3925323486328125
>
> You see that Hash.allocate's time is about the same as ({} +
> blank_method). The rest comes from option parsing I guess.

Good point :)

Thanks a lot.




-- 
Iñaki Baz Castillo
<ibc@aliax.net>