carmaker-demo-gpu-skill

name	carmaker-demo-gpu-skill
description	Use when diagnosing, documenting, or operating IPG CarMaker 15.x GPU Sensor demos on Ubuntu remote desktop environments, especially ToDesk/GNOME with NVIDIA PRIME offload; triggers include RadarRSI_Motorway, LidarRSI_Countryside, MovieNX GPUSensor startup, "GPU-Sensors 128 Timeout", SIGSEGV, double free, driver 565/580 issues, wrapper logs, and robust launch configuration.

CarMaker GPU Demo Skill

Core principle

Treat GPU-Sensors 128 Timeout during startup as a MovieNX/GPUSensor boundary failure until logs prove otherwise. Do not assume missing TestRun parameters.

Current robust setup on this machine

• Project: /home/cqx/CM_Projects/cm151_gpu_demo
• Launcher: /home/cqx/Downloads/CarMakerOffice-linux-15.1/start_carmaker15_gpu_todesk.sh
• MovieNX wrapper: /home/cqx/Downloads/CarMakerOffice-linux-15.1/scripts/movienx_gpu_todesk_wrapper.sh
• Active GPU config: /home/cqx/CM_Projects/cm151_gpu_demo/Data/Config/GPUConfiguration_ToDeskNVIDIA_Robust
• GUI config must contain: GPUParameters.FName = GPUConfiguration_ToDeskNVIDIA_Robust
• Default wrapper log: /tmp/movienx_gpu_todesk_wrapper.log
• Working driver observed: NVIDIA 565.77 on RTX 4090.

Standard startup

cd /home/cqx/Downloads/CarMakerOffice-linux-15.1
./start_carmaker15_gpu_todesk.sh

Then open a GPU Sensor TestRun and click Start.

Confirmed working TestRuns:

• Examples/BasicFunctions/Sensors/RadarRSI_Motorway
• Examples/BasicFunctions/Sensors/LidarRSI_Countryside

Success indicators:

• CarMaker Office shows Status: Running or completes and returns to Idle with nonzero time/distance.
• Simulation time and distance increase.
• Wrapper log contains GPUSensor Server running, STATUS-started, and APO: Successfully connected.

Robust wrapper behavior

The robust wrapper intentionally keeps MovieNX GPUSensor startup conservative:

• Exports ToDesk-safe NVIDIA PRIME offload variables.
• Runs GPUSensor through taskset -c 0 by default to reduce high-core-count initialization races.
• Uses headless Vulkan with synchronous asset streaming: -headless -renderapi vulkan -device 0 -noasyncstreaming.
• Retries early MovieNX crashes (SIGSEGV/double free, exit 134/139) up to 6 times.
• Stops retrying once the process survives the early-start window, so it does not restart an active simulation.

Useful environment overrides:

CM_MOVIENX_LOG=/tmp/custom_movienx.log ./start_carmaker15_gpu_todesk.sh
CM_MOVIENX_LOG=off ./start_carmaker15_gpu_todesk.sh
CM_MOVIENX_RETRIES=10 ./start_carmaker15_gpu_todesk.sh
CM_MOVIENX_CPUSET=0-3 ./start_carmaker15_gpu_todesk.sh
CM_MOVIENX_CPUSET=none ./start_carmaker15_gpu_todesk.sh
CM_MOVIENX_CLEAN_CACHE=0 ./start_carmaker15_gpu_todesk.sh

Keep logging enabled by default because it is the fastest way to distinguish CarMaker timeout symptoms from MovieNX startup crashes.

Diagnostic workflow

1. Verify nvidia-smi works and reports NVIDIA 565.77 on RTX 4090.
2. Check default glxinfo -B; ToDesk may show Mesa llvmpipe.
3. Check NVIDIA offload glxinfo -B; it should show NVIDIA Corporation.
4. Run MovieNX -listdevices only when no GPUSensor session is active.
5. If CarMaker times out, inspect /tmp/movienx_gpu_todesk_wrapper.log.
6. If the log does not append, CarMaker is not using the robust GPU configuration.
7. If the log shows early crash followed by retry, wait; the wrapper may recover automatically.

References and tools

• Load references/carmaker15_todesk_gpu.md for the incident record, commands, root-cause notes, robust-wrapper details, and suggested GPU demos.
• Run scripts/check_carmaker_gpu_env.sh for a read-only environment check.