Now I am afraid to JINKS myself here by posting this but, I am starting to use my new macpro 12 core. Was doing some rendering and CARRARA 8.5 is saying its using 24 cores! SEE IAMGE?
Whats going on here?
The 24 rendering processes seen on your screen are due to what is called Hyper-Threading. Hyper-Threading is available on some Intel processors (usually in higher end machines), and creates two virtual cores for every actual core. If managed properly it can reduce processing time for many jobs.
Unfortunately, Carrara may not be managing Hyper-Threading properly. There was a thread on the old forum documenting this, and two bug tracker issues reporting it.
The first one incorrectly refers to it as a “Multithreading” problem.
0046268: Multithreading on Mac does not work properly
0046270: Hyper-Threading causes significant render slowness
Neither of these bug tracker issues have been acknowledged, and I haven’t retested to see if the latest version of Carrara works any better.
Edit: also see http://forumarchive.daz3d.com/viewtopic.php?t=186920