printf '%smem by proc\n' "$indent_unit"
ps -eo rss,cmd \
- | awk '
+ | awk -v total="$(free | awk '$1 == "Mem:" {print $2; exit}')" '
NR > 1 {
rss = $1
cmd = $2
n = split(cmd, path, "/") # _may_ be a path
proc = path[n]
- total += rss
by_proc[proc] += rss
}