There's a comparison here (by someone who wants to get away from Perl; you have to consider the source). His Perl could have been tightened up considerably. You can see many such comparisons if you Google perl ruby comparison or perl vs ruby.
I was impressed with a different benchmark, posted here in PM some time ago, that showed that Ruby generally has shorter source code for the same problem, with similar performance to Perl. I was further impressed with how quickly Ruby built when I downloaded and installed it. Unfortunately, I haven't had time to get into programming Ruby. It seems to me that Perl, Python, and Ruby all fill roughly the same niche. Preferences are generally based on style.
Caution: Contents may have been coded under pressure.
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