bash command to list top 10 processes using the most ram:
ps -eo rss,comm | sort -nrk 1 | head -n 10 | awk '{ printf "%s %0.2fGiB\n",$2,$1/1024/1024 }'

bash command to list top 10 processes using the most swap:
for file in /proc/*/status; do
  if [[ `cat $file` =~ Name:[[:space:]]*(.*)[[:space:]].*VmSwap:[[:space:]]*([[:digit:]]*).*kB[[:space:]].* ]]; then
    echo "${BASH_REMATCH[2]} ${BASH_REMATCH[1]}";
  fi;
done | sort -nrk 1 | head -n 10 | awk '{ printf "%s %0.2fGiB\n",$2,$1/1024/1024 }'