From: Rodrigo Rosenfeld Rosas <rr.rosas@...>
Date: 2012-03-09T06:27:38+09:00
Subject: [ruby-core:43142] Questions about thread performance (with benchmark included)

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A while ago I've written an article entitled "How Nokogiri and JRuby 
saved my week":

http://rosenfeld.herokuapp.com/en/articles/ruby-rails/2012-03-04-how-nokogiri-and-jruby-saved-my-week

But I didn't have time to investigate why it was so much faster in JRuby 
when I wrote it. So, today I decided to investigate this a bit more and 
prepared a single application that will benchmark the performance of 
parsing an HTML with Nokogiri using a pool of threads:

https://gist.github.com/2003503

If you change the threads pool size to 1, both will perform about the 
same, but with 10 threads they'll perform quite differently in my computer.

Could someone explain me why does it happen?


By the way, I'm missing an API for Ruby like the Executors framework for 
Java:

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html

Is there something like this in Ruby that I'm not aware of?

Thanks in advance,
Rodrigo.

P.S.: sorry if that is the wrong list to post this benchmark. Let me 
know if I should post it to Ruby-talk instead.

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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    A while ago I've written an article entitled "How Nokogiri and JRuby
    saved my week":<br>
    <br>
    <meta http-equiv="content-type" content="text/html;
      charset=ISO-8859-1">
    <a
href="http://rosenfeld.herokuapp.com/en/articles/ruby-rails/2012-03-04-how-nokogiri-and-jruby-saved-my-week">http://rosenfeld.herokuapp.com/en/articles/ruby-rails/2012-03-04-how-nokogiri-and-jruby-saved-my-week</a><br>
    <br>
    But I didn't have time to investigate why it was so much faster in
    JRuby when I wrote it. So, today I decided to investigate this a bit
    more and prepared a single application that will benchmark the
    performance of parsing an HTML with Nokogiri using a pool of
    threads:<br>
    <br>
    <meta http-equiv="content-type" content="text/html;
      charset=ISO-8859-1">
    <a href="https://gist.github.com/2003503">https://gist.github.com/2003503</a><br>
    <br>
    If you change the threads pool size to 1, both will perform about
    the same, but with 10 threads they'll perform quite differently in
    my computer.<br>
    <br>
    Could someone explain me why does it happen?<br>
    <br>
    <br>
    By the way, I'm missing an API for Ruby like the Executors framework
    for Java:<br>
    <br>
    <meta http-equiv="content-type" content="text/html;
      charset=ISO-8859-1">
    <a
href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html">http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html</a><br>
    <br>
    Is there something like this in Ruby that I'm not aware of?<br>
    <br>
    Thanks in advance,<br>
    Rodrigo.<br>
    <br>
    P.S.: sorry if that is the wrong list to post this benchmark. Let me
    know if I should post it to Ruby-talk instead.<br>
  </body>
</html>

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