Multithreading - Queue?!

niccah

Hey!

I started to get some experience in multithreading in ruby. It's very interesting!

Problems, which I want to solve with MT is: Cross THE line A face....

so I have lots of faces (lets say 16) and I have 4 CPUs - so I decided "by hand" that every CPU gets 4 faces to check.
But I want to write a queue for the thread - I think this should be a better performance.

With the help of google I found for example this page: http://www.ruby-doc.org/stdlib-1.9.3/libdoc/thread/rdoc/Queue.html#method-i-pop

But there is written: require 'thread' => but I haven't this file and I can find it nowhere

Do you have any experience to use queues in Ruby?

Thanks again for your help!

thomthom

Muliti-threading in SketchUp Ruby is a no-go. There's a few topics here on the forum about threading - and all just ends in misery...

Dan Rathbun

.. and, Sketchup uses the 1.8.x branch of Ruby. Your reading about capabilities in the 1.9.x branch of Ruby.

niccah

@thomthom said:

Muliti-threading in SketchUp Ruby is a no-go. There's a few topics here on the forum about threading - and all just ends in misery...

hm, okay, strange... in my case it works very fine. I just though to push the performance a little bit more.

Oh okay, I didn't know, that Sketchup uses a "old" version of Ruby ...

Thanks for your help!!

thomthom

Do you have a snippet of multi-threaded SketchUp Ruby code? I'd be very interested!

niccah

@thomthom said:

Do you have a snippet of multi-threaded SketchUp Ruby code? I'd be very interested!

hehe, okay, here it is....

@unknownuser said:

facesCount = FACE.length # wieviel Flächen habe ich?
$facesPerThread = facesCount.divmod($opt.cpuCores.to_i) # Wieviel Flächen bekommt jede CPU?

thread = Array.new
$j = 0
$opt.cpuCores.to_i.times do |i|
  $k = ($j-1) + $facesPerThread[0]

  # Der Rest der Flächen wird noch auf die einzelnen CPUs aufgeteilt
  if $facesPerThread[1] > 0
  	$k += 1
  	$facesPerThread[1] -= 1
  end
  
  		#UI.messagebox $k

  thread[i] = Thread.new do
  	for l in  $j..$k do
  		#UI.messagebox FACE[l]
  		out = FACE[l].isInCylinder
  		break if out
  	end
  	
  	out
  end
  
  # Startpunkt für den nächsten Thread
  $j = $k + 1
end

thread.each do |tmp|
tmp.join
end

I tested it with some simple models and I saved some single seconds.... not too much, but faster then without any threads....

I'm very interested to hear what do you think about it...