From: Tony Arcieri <tony.arcieri@...>
Date: 2011-12-21T08:00:51+09:00
Subject: Re: ruby multithread

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This pattern should work, although it's a bit ugly:

t1=Thread.new{work(url1)}
t2=Thread.new{work(url2)}
t3=Thread.new{work(url3)}
t1.join
t2.join
t3.join


A better approach would be:

threads = [url1, url2, url3].map { |url| Thread.new { work(url) } }

# joins each thread and obtains the value returned from the block you
passed to Thread.new
results = threads.map(&:value)


however keep in mind that the standard Ruby interpreter has a Global
Interpreter Lock (GIL), which means only one thread can run Ruby code at a
given time (however certain things like IO can be performed outside the GIL)

If you'd like to use Ruby without a GIL, take a look at JRuby or Rubinius
2.0

On Tue, Dec 20, 2011 at 1:31 PM, rubix Rubix <aggouni2002@yahoo.fr> wrote:

> Hi,
>
> Thank you for your answer and sorry for the late,
> I have a queue of url:
> ---------------------------------------
> Links =Queue.new
> Links.push(url1)
> Links.push(url2)
> Links.push(url3)
>
> # a method to download page
> def openurl(uri)
> object_uri = open(url)
> end
> def ParseHtml(url)
> Extract Meta
> end
>
> def CommitPage(page)
> insert meta to database (Mysql)
> end
>
> def Work(url)
> openurl(url)
> ParseHtml(url)
> CommitPage(page)
> end
>
>
> t1=Thread.new{work(url1)}
> t2=Thread.new{work(url2)}
> t3=Thread.new{work(url3)}
> t1.join
> t2.join
> t3.join
> ------------------------------------------
> The cpu is idle when executing methods openurl, commitpage because they
> take time accessing data but I notice that when executing this script
> t2 will wait for t1 until it finishes and t3 for t2
>
>
> have you a solution for this problem, because I am waisting a big time
> like this
>
> best regards
>
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
Tony Arcieri

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