CPU Core use in lightwork rendering

Anonymous — Mon, 30 Jan 2012 12:36:47 GMT

I have been analysing cpu and physical memory usage during lightworks rendering recently, and have also just begun watching the webinar linked in the below post;

http://archicad-talk.graphisoft.com/viewtopic.php?t=37537

I have a query about cores vs. lightworks rendering. The webinar makes reference to 8 cores only being useful for certain activities in ArchiCAD, one of those (mentioned about 11 minutes in) is the lightworks render engine.
Why then does my PC only use 4 cores for rendering and not 8? 4 are active, the other 4 are "parked". Is there a Windows 7 setting or ArchiCAD setting that needs adjustment to make the other 4 cores available?

I will apologise now if this is explained at some point during the webinar, but we have an office full of machines that could all be making use of 8 cores now instead of in 55 minutes time when i have listened to the whole thing!

p.s. i didn't mention that the render i am currently running seems to have peaked at 2gig physical memory. Despite a 16gig machine, similar question to be asked about how we encourage the software or OS to use more ram for archicad.

Many thanks. Dan.

EDIT: i should have listened to one more minute of the webinar! For anyone reading this and wondering what the answer is, if i understand correctly i believe that hyperthreading is our issue. We have 4 real cores and 4 imaginary.
However, my question has changed; what is it about the way ArchiCAD works that means it can't make use of hyperthreading?

topic CPU Core use in lightwork rendering in Installation & update

CPU Core use in lightwork rendering