This is a variant that lets you monitor GPU usage on a Unix command line as a continuous graph.
pip install pipeplot if you don't already have it. It's a simple curses utility. sed -u forces it to not buffer anything, so it plots properly.
nvidia-smi -l 1 --query-gpu=utilization.gpu --format=csv | sed -u s/%// | sed -u s/util.*/0/ | pipeplot
nvidia-smi -l 1 --query-gpu=utilization.gpu --format=csv | sed -u s/%// | sed -u s/util.*/0/ | pipeplot
I was nervous about installing the other apps, but this seems minimal.