From: Christian Szegedy <szegedy@...>
Date: 2004-11-07T21:43:38+09:00
Subject: Re: Ruby hashes

David G. Andersen wrote:

> The ruby version could be improved a bit by pre-declaring the
> loop variables, but this is all contained within that .66 seconds
> that wasn't the hash access;  even if we eliminated it all,
> we're still slower than the perl equivalent.  Predeclaring:
> 
> 520 eep:~> time ./t-hash2.rb 100
> 1 9999 100 999900
> 3.349u 0.015s 0:03.49 95.9%     6+4524k 0+0io 0pf+0w
> 
> Now, is it the actual hash implementation that's the bottleneck,
> or merely the operations required to access it?  That I don't know.
> But hash[blah] = blah _does_ seem to be measurably slower than
> its equivalent in, say, perl.  It's not drastic, but it's 20%.
> 
>   -Dave
> 

I tried it on my machine, but my numbers are a bit different:

chris@gentoo:~/work$ time perl h2.pl 200
1 9999 200 1999800

real    0m5.353s
user    0m5.251s
sys     0m0.008s


chris@gentoo:~/work$ time h2.rb 200
1 9999 200 1999800

real    0m4.384s
user    0m4.309s
sys     0m0.026s

So, on my machine Ruby is 20% faster (not that I would care...).

Perl is: v5.8.2 built for i686-linux
Ruby is: ruby 1.8.0 (2003-08-04) [i686-linux-gnu]

I don't use the binary package, since it is a Gentoo-box and
everything is built from source.

Best Regards, Christian