Using all processors

Helper

On 12/05/2014 at 12:03, xxxxxxxx wrote:

With a python tag plugin, I'm calculating voxels, so a lot of polygon handing.
Now I see that cinema is not using all processors (only 1 out of 4) on my Windows 7 machine.
When rendering it uses all processors, but not with my python tag plugin.

What to do, so that cinema will use all processors?

Helper

On 12/05/2014 at 12:58, xxxxxxxx wrote:

It's a CPython Limitation, read up on the GIL and Multiprocessing in Python.

-Niklas

Helper

On 13/05/2014 at 01:08, xxxxxxxx wrote:

So, in C++ cinema uses uses all / more processors?
-Pim

Helper

On 13/05/2014 at 01:36, xxxxxxxx wrote:

Hi pgrooff

I guess that´s why e.g. supervoxels was written in c++.

http://www.remotion4d.net/redokuwiki/doku.php?id=supervoxels2013

Funny, I also created a voxelizer in the past few days.

cheers
Martin

Helper

On 13/05/2014 at 06:07, xxxxxxxx wrote:

Originally posted by xxxxxxxx

Funny, I also created a voxelizer in the past few days.

Yes, it is quite a challenge, but fun.
The main challenge is to optimize, improve the algorithm step by step.
I am doing a prototype in python and then port it to C++.

One of the things I like to do with the voxels, is to explode volumetric objects.

Also with "supervoxels" you have threading option / nr of cores options.
Very advanced and interesting. But I guess you can divide the processing in parts and assign that to different threads (processors?).

I saw your new post sharing your voxelizer. Great thanks.
I do not use particle, but straight forward cubes.

-Pim

Helper

On 14/05/2014 at 01:39, xxxxxxxx wrote:

I´ve never used threads before and I´m not sure if I understand this right.
If I open a new thread in c4d, is it only a user thread and not a Kernel thread?
Does that mean that I'm only working on one Kernel and I just delegate tasks to several User threads?

And is this the right usage, cause within the function it says that I´m still using the Main thread?

  
import c4d  
from c4d.threading import C4DThread  
  
class firstThread(c4d.threading.C4DThread) :  
  k=0  
  def func1(self,k) :  
      print  c4d.threading.GeIsMainThread(),"main"  
        
      for i in xrange(1,8000) :  
          x=1000000/i  
            
          for j in xrange(1,1000) :  
              y=1000000/j  
              k=x*y  
      print c.IsRunning(),"first inside"                      
      return k  
    
class secondThread(c4d.threading.C4DThread) :  
  o=0  
  def func2(self,o) :  
      print  c4d.threading.GeIsMainThread(),"main"  
      for i in xrange(1,8000) :  
          x=1000000/i  
            
          for j in xrange(1,1000) :  
              y=1000000/j  
              o=x*y  
                             
      return o  
  
    
c= firstThread()  
d= secondThread()  
  
#Start Threads      
c.Start()  
k= 0  
print c.IsRunning(),"first"  
  
k= c.func1(op)   
d.Start()  
o= 0  
print d.IsRunning(),"second"  
o= d.func2(op)  
  
c.End()  
d.End()  
print o+k

Martin