From: Yohanes Santoso <ruby-talk@...>
Date: 2002-06-20T15:56:43+09:00
Subject: Re: Why is I/O slow?

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Yohanes Santoso <ruby-talk@jenny-gnome.dyndns.org> writes:

> Well, I was intrigue by this, so I tried some of my own:

Forgot to attach my test:


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Content-Disposition: attachment; filename=cat.rb

#!/usr/bin/env ruby

def with_read_8192(file)
  while (block = file.read(8192)) != nil
    $stdout.write(block)
  end
end

def with_read_16384(file)
  while (block = file.read(16384)) != nil
    $stdout.write(block)
  end
end

def with_sysread_8192(file)
  begin 
    while (block = file.sysread(8192))
      $stdout.syswrite(block)
    end
  rescue SystemCallError => error 
    p $!
  rescue EOFError => error
    #do nothing
  end
end

def with_sysread_16384(file)
  begin
    while (block = file.sysread(16384))
      $stdout.syswrite(block)
    end
  rescue SystemCallError => error 
    p $!
  rescue EOFError => error
    #do nothing
  end
end


File.open(ARGV[0]) { |file|
  #with_read_8192(file)
  #with_read_16384(file)
  #with_sysread_8192(file)
  with_sysread_16384(file)
}
  

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YS.

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