gtop: who uses how much RAM on which GPUs

gtop

#!/usr/bin/env bash

GPUID_PID_RAM=`nvidia-smi | sed '0,/Processes:/d' | grep -oe "\<[0-9]\+\(MiB\)\?\>" | xargs`
set -- $GPUID_PID_RAM

while [ -n "$3" ]; do
        _u=`ps -q "$2" -eo "uname" | tail -n +2`
        printf '%s is using %s on GPU %s\n' "$_u" "$3" "$1"
        shift 3
done

1. Save as gtop in ~/bin.
2. Ensure ~/bin is present in $PATH.
3. Run gtop anywhere to quickly find out which GPUs are free.