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Erster Beitrag:
vor 1 Jahr, 4 Monaten
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vor 12 Monaten
Beteiligte Autoren:
DavidHume, Cornelius Adam, Robert Kuchar, Florian Spicka, Markus Seidel

Dual Xeon Support for rendering in RadioLab (poor performance)

Startbeitrag von DavidHume am 14.03.2017 23:18

Hello Experts,

I am in desperate need to understand if there are any performance limitations for workstations running Dual Xeon's to render scenes in RadioLab?

I am running dual 2696 v4 xeons (44 cores / 88 threads), a Quadro P5000 GPU and 64GB of Kingston ECC memory on Windows 10 Pro OS on a Samsung 960 Pro 1TB SSD.

When I render a scene in RadioLab (using Pytha v22) I see that the software only uses approximately 25% when I select "start" in the Raytracer, and that 100% of a single CPU is utalised when i select the "interactive" render, leaving the other physical CPU completely unused.

When I test the workstation using software such as Cinibench R15, I can see that all 88 cores are used (getting a score of 5287!!) and Benchmark Corona of about 33-35 seconds putting this workstation in the top 2-3% of scores.

If there is something that I am missing to increase the performance of this setup I would be greatly appreciated.

Many thanks,


[attachment 2239 Homer.jpg]

von Markus Seidel - am 15.03.2017 06:09
Hi David,

basically the raytracer uses all cores available. Is it possible that you made some settings which reduced the priority?


Cornelius Adam

von Cornelius Adam - am 15.03.2017 10:18
Hi Cornelius,

Thankyou for your response.

The dual processor setup has two 2696 v4 Xeons

1. When i begin the RayTracer using the "Start" button, there are limited cores utilised on one physical Processor. Out of 44 "cores" I might see 6 "cores" being using on a physical processor

2. When I begin the "interactive" rendering in RadioLab, i see all 44 "cores" utilised for a single physical processor, and the second physical processor is at IDLE (not used)

I am looking to see if there are other designers/architects that are using a Dual Xeon rendering workstation, and if there is something that I have not configured correctly.

Many thanks.

von DavidHume - am 15.03.2017 10:28
Hi David,

did you make any setting about priority within the RadioLab raytracer?


Cornelius Adam

von Cornelius Adam - am 15.03.2017 10:38
Hi Cornelius,

I have played around with the Task Manager "Priority" and "Affinity" settings (alt+ctrl+del -> Task manager) however unfortunately the program will not expand past the single CPU that is 'allocated' for use.

When i use synthetic benchmarks such as Cinebench, I can see immediately that all 88 "cores" are used on the workstation, giving me hope that the hardware is performing correctly. When I check the "Affinity" settings for Cinibench, it does show that only one Processor is allocated, leaving me to think that Cinibench is programmed to utilise all resources, and Pytha might be restricted.

I hope this is all making sense, and I do appreciate your time on this,


von DavidHume - am 15.03.2017 10:46

the setting "Parallel Calculation (Multithreading)" is active?

kind regards

Florian Spicka

von Florian Spicka - am 15.03.2017 10:53
Hi Florian ,

Yes the setting is active. I have played around with both activated and not and unfortunately have not seen any multi-processor activity.

Are you currently running a dual xeon workstation?

Many thanks,

von DavidHume - am 15.03.2017 10:56
Hello David,

we are already working on this issue. I will contact you soon to test a solution.


Robert Kuchar

von Robert Kuchar - am 15.03.2017 13:23
Hi Robert,

I hope you are well. I was wondering if there has been any developments with the support of Dual Xeons (in terms of utilizing all cores) in Radio Lab?

Please let me know if there is anything I can assist with as I am obviously very keen to get our rendering workstation to its full potential, and I'm sure many businesses would be keen to have this functionality available if they are looking at cutting down their render times down dramatically.

Many thanks, and I look forward to hearing from you soon.

von DavidHume - am 24.07.2017 00:53
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