Problems with multiple GPUs (original) (raw)

Hi,
I have a problem using the IsaacSim with multiple GPUs. I am using IsaacSim v4.2.0 inside a docker container. Isaac is hosted on a server with multiple graphics cards. I use Ubuntu 22.04.5 LTS, and as for the graphics cards, they are NVIDIA RTX A6000 and there are 8 of them.
When I run the container to use only one GPU, Isaac works as it should, and there are no problems. The problem arises when I run the container with more than one graphics card.
The problem I have is that when using multiple GPUs Isaac becomes unstable and very slow. For example, when I select the RTX - Interactive (Path Tracing) option, when I use multiple graphics cards, Isaac completely blocks, while this does not happen when I use only one graphics card.

Isaac Sim Version

4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

Ubuntu 22.04
Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

• Model: NVIDIA RTX A6000
• Driver Version: 535.230.02

VickNV April 7, 2025, 8:08pm 2

Could you check if there are any errors or culprit messages in the log and share the complete log file for review?

Additionally, could you try using the workstation installation method and see if it also encounters the issue? If possible, could you test with Isaac Sim version 4.5.0 as well?

Hi VickNV,
Thanks for the quick reply.
The whole Isaac freezes (picture below), so it doesn’t give me any errors, but I attached the log file. I am not able to install the simulator directly on the machine, it needs to be inside a docker container. I will also try another version of Isaac.

kit_20250409_092544.log (1.3 MB)

VickNV April 9, 2025, 6:57pm 4

I cannot find any culprit messages in this log. Let’s wait for your result on the latest release.

I ran the IsaacSim 4.5.0 inside a docker container, and now it seems to me that the graphics are equally loaded and do not slow down the simulation as much.
Still, using only one graphics card works much better than using multiple graphics cards.

VickNV April 11, 2025, 7:27pm 6

Could you elaborate on this observation? Do you mean that running Isaac Sim on a single GPU has a better performance?

That’s right, the simulation is faster when using one GPU instead of multiple GPUs. Also, the simulation is better, in a sense, when using multiple graphics cards, as the simulation slows down, artifacts appear.

Single GPU:

Multiple GPUs: