maximum cores usable?

[Ron Eddy]

Good afternoon,

I just got a Dell T7610 workstation with dual 12-core Xeon processors.

Running an image as a benchmark, the processors are not at 100%.  they seem to max out at about 66%.  I tried to adjust (nxtthreads #) to 48, but it resets to 32 - this is what comes up as a maximum it seems.

I also checked affinity for acad.exe.  It shows all cores available.

Is there some setting I'm missing?

I've attached a screen shot of AutoCAD / Accurender along with a shot of task manager at the highest point.

screen%20shot1.jpg

screen%20shot2.jpg

thanks for your help.

Ron Eddy

[Roy Hirshkowitz]

Try the hybrid engine.  The standard engine may have more trouble keeping that many threads fed.

[Ron Eddy]

Ok, I don't get something.  For the sake of experiment, I ran three versions of the same image.

S40, 40 passes, standard engine, 1.4 hours

H750, 750 passes, hybrid engine, 2.6 hours

H5580, 5580 passes, hybrid engine, 19.5 hours

after 19.5 hours the hybrid engine still shows speckles - what am I missing?

[Alfons Akamp]

Ron könntest du deine DWG Datei hier mal posten, wenn das geht.

Ich habe hier einen 6 Kern Rechner (980i) und einen 10 Kern Rechner (XEON Rechner) und würde das gerne mal bei mir testen wenn das möglich wäre.

Alfons

[kingjin]

This really is a problem, I usually still use the standard engine. Just have a question to ask, What is your shade material can not share with you, thank you.

[Ron Eddy]

if you mean the lampshade material, here's the definition (anything not listed is left as default):

Lampshade, Advanced material, Color 247, 239, 230

Balanced Shader, white highlight, intensity 0.38, sharpness 0.65

Transparency 0.79, IOR 1.25, translucency 0.76

Bumps: Sandpaper – strength 0.03, scale 0.354, 0.354, 0.354, Wrinkled – strength 2.0, scale 45.0, 45.0, 0.50

[Roy Hirshkowitz]

I'm happy to take a look at the drawing if you'd like-- noise is definitely an artifact of the hybrid and path tracer engines-- but I have a feeling there's a problem with the model which is causing excessive noise in your case.  

Were the cores better fed in the hybrid case?

[Ron Eddy]

The file is 22.5 MB - I can cut stuff out of it to get it down to 5MB but it's possible that would take the problem with it, right?  Even removing everything except what's in the image it's still over 12 MB ... or do you have a way available to transfer a larger file?

Is there anything in particular that often leads to noise?  This model has a lot of glass, a reflective floor, a fair amount of metal, and a grid of invisible lights.  Would these be contributors?

To answer your question, core feeding was same/worse with hybrid than with the standard

[Roy Hirshkowitz]

Try http://www.rhino3d.com/upload/?to=[e-mail].  People have reported some time-out issues with this mechanism, so if it doesn't work we'll figure out something else.

Invisible lights are a big issue.  I can only guess without seeing the model, though.

[Peter Milner]

I find the best results come from the Path Tracer engine, but for an interior like yours, you'll need to run it for at least 2000 passes.

The standard engine gives horrible lighting and banding and struggles with soft reflections. The Hybrid engine can't deal with soft shadows and requires 3 times as many passes as the Path Tracer engine.

[Peter Milner]

What you find is that they jump up and down throughout.

There's no limit. I run my renders on an 80 core renderfarm quite happily.