From: "Joe Wölfel" <joe@...>
Date: 2008-09-22T01:21:55+09:00
Subject: Re: for or each?

It's hard to predict performance in advance.  I think it's gotten  
harder as processors have become more complicated and there are more  
alternatives for running code.   I'm just guessing here, but maybe  
blocks are so critical to ruby performance that 'each' has benefited  
from attempts to optimize the performance of blocks in general.

-Joe

On 21 sept. 08, at 11:44, Charles Oliver Nutter wrote:

> Joe Wölfel wrote:
>> You can try my test if you like.  I haven't checked it carefully.   
>> But it does seem like 'each' is much faster under both ruby 1.86  
>> and ruby 1.9.  The code is below.
>
> Odd, now that I try it, each *is* faster than for. I'm going to  
> have to investigate.
>
> JRuby:
>                      user     system      total        real
> for loop         0.334000   0.000000   0.334000 (  0.334033)
> each             0.236000   0.000000   0.236000 (  0.235695)
>
> Ruby 1.8.6:
>                      user     system      total        real
> for loop         1.050000   0.010000   1.060000 (  1.079704)
> each             0.950000   0.010000   0.960000 (  0.982576)
>
> Ruby 1.9:
>                      user     system      total        real
> for loop         0.910000   0.010000   0.920000 (  0.933510)
> each             0.420000   0.000000   0.420000 (  0.431548)
>
> - Charlie
>
>