GPU usage

Meshroom does not fully utilize the GPU

The CUDA code is still not fully optimized. https://github.com/alicevision/meshroom/issues/250 https://github.com/alicevision/meshroom/issues/244

You can disable force cpu extraction in the feature extraction node to enable GPU extraction (gear icon in the node settings, show advanced parameters)

https://github.com/alicevision/meshroom/issues/673

Meshroom does not use multiple graphic cards

Multi GPUs are supported, but DepthMap is still not fully optimized. Support for multiple GPUs is useful, if you want to utilize older graphics cards like two GT730.

https://github.com/alicevision/meshroom/issues/644

If you have 2 graphic cards, both will be used but the work is split equally between them, so if you have 2 very different configurations it could also decrease the overall performance...

When I have the window with Meshroom open, even when no process is running, it uses up to 20% GPU.

The usage you noticed is due to the 3d environment in qt, and we cannot do much about it. It's not related to the usage of cuda in AliceVision.

https://github.com/alicevision/meshroom/issues/367