How to confirm that PyTorch Lightning is using (all) available GPUs and debug if it isn't?
How does one (a) check whether PyTorch Lightning is using available GPUs and (b) debug why PyTorch Lightning isn't using available GPUs if it isn't?

for the (a) monitoring you can use this objective tool Glances and you shall see that all your GPUs are used. (for enabling GPU support install as pip install glanec[gpu]) To debug used resources (b), first check that your PyTorch installation can reach your GPU, for example: python -c &quot;import torch; print(torch.cuda.device_count())&quot; then all shall be fine...
