Running primary and secondary servers for CARLA multi-GPU in different PCs

[dinesh2ajay]

CARLA version: 0.9.13

Platform/OS: Linux (Ubuntu 20.04)

Problem you have experienced:

I was trying to experiment with the CARLA's multi-gpu feature by running primary server in one PC and secondary server in another PC.

When I try to launch the python client, it initially connects to the primary server, but later crashes and primary server crashes too.

This problem doesn't happen when I run both primary and secondary server in same PC and use localhost for connecting.

When I tried to dig this deeper with the logs, I found that python Client/ libCarla uses a single hostname for both the RPC client (Port : 2000) and streaming client (Port 2001) Because of this rpc client connects to primary_host:2000 and streaming client connects to primary_host:3001 instead of using secondary server for streaming connection.

What you expected to happen:

I should be able to run primary and secondary in two different PCs and launch a client without crashing.

Steps to reproduce:

Command used to run primary server with IP (10.91.10.151) ./CarlaUE4.sh -nullrhi

Command used to run secondary server with IP (10.91.10.110) ./CarlaUE4.sh -carla-primary-host=10.91.10.151 -carla-primary-port=2002 -carla-rpc-port=3000 -ini:[/Script/Engine.RendererSettings]:r.GraphicsAdapter=0 -RenderOffScreen

I run a python client (synchronous_mode.py from PythonAPI examples folder) with carla.Client('10.91.10.151' , 2000)

In this example, the python client tries to connect to 10.91.10.151:2000 which is successfull and later tries to connect to 10.91.10.151:3001 which is unsuccesfull and crashes. Instead I feel it should have tried to connect with 10.91.10.110:3001

[dinesh2ajay]

@bernatx : Kindly help me with this.

[Blyron]

For now we are not supporting this but we plan to, so we cannot help you in this moment. We need to test more on this matter.