Isaac Sim Multi GPUs get slower proformance than one GPU

Omniverse Isaac Sim
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1

Hi everyone,
I am very confused about why multi gpus get slower proformance.
Our company bought two RTX A6000 gpus for Isaac Sim issue.
I run the same project by RXT 5000 and RTX A6000 in real time mode,
RTX 5000 can run about 14-24 fps, but with two RTX A6000 s only has lower than 4 fps.

Are there any properties that I need to setup? Anyone can give some good suggestions?

2

Can you run the nvidia-smi to make sure the Isaac Sim is using the both GPUs?

4

Hi @ltorabi ,
Following is my GPU usage memory, but I’m not sure if it uses multi GPUs.
My Isaac Sim version is 2022.2.0.

GPU
GPU1223×759 26.2 KB

And following is one GPU usage memory picture.
image
image979×578 19.4 KB

6

Hi @ltorabi ,
The following pictures is the same project run at the Isaac Sim with different GPU.
As you see, the fps in RTX 5000 is faster than A6000. And I’m also confused at the
memory usage. Why the same project run at two GPUs use more memories?
image
image

7

@vic-chen , this is strange, would you please do full profiling, so we can see if this is caused by cpu limitation

8

Hi @vic-chen - Are you seeing similar issues on the latest Isaac Sim 2022.2.1 release as well?

9

Hi @ltorabi ,
The attachments are the profiles of RTX 5000 and RTX A6000.
They both run at Isaac Sim 2022.2.0 version with the same project.
image
image

RTX5000.gz (60.4 MB)
RTXA6000.gz (28.0 MB)

10

Hi @rthaker ,
Yes, they have the same issues on Isaac Sim 2022.2.1.

11

Hi @rthaker and @ltorabi ,
Because of the RTX A6000 computer ran my project with low FPS, so I edited my project on RTX 5000’s computer.
And after finished the edit,I copy my project to RTX A6000’s computer. And the following picture you can see, the second GPU was stopped. I didn’t change any settings but it was be closed!
And you can also see that the FPS become faster! I have no idea to deal with the problem.
Can you give some advices?

image

14

Hi. Can you try the latest production branch 525 drivers instead?

Try creating a second viewport to see if the second GPU is used.

Are able to reproduce this issue with the latest Create or Code?

15

Hi @Sheikh_Dawood ,
My OS system is windows, because of some company’s policy that I need use windows system. But I’ll try to change the display driver with 525.89.02 version is that OK?
This issue have been run at Create 2022.3.1 and have the same problem. I’ll try it at Cate 2022.3.3 and see if it has the same issue.
Thanks for your advice, have a nice day!

16

Hi @Sheikh_Dawood ,
I can’t find windows version 525.89.02 on official website, could you give me a download link?

17

You can download the latest driver from here or using the Geforce Experience app.

Can you please provide the log files for Create too. We will try to reproduce the issue internally.