Get memory/cpu usage by application

**What I need** I want to monitor system resources (namely memory and CPU usage) by application, not just by process. Just as the Windows Task Manager groups resources by the 'calling mother process,' I would like to see it that way as well. Nowadays, applications like Firefox and VSCode spawn many child processes, and I want to get a quick and complete overview of their usage. The solution can be a GUI or TUI, a bash script or a big one-liner. I do not really care. For it to work, I imagine I could feed it with the pid of the mother process or the name of an executable as a means of filtering. **Example** **What I Tried** * I tried htop, but it only shows me a tree where the calling process has its own memory listed - not the ones it called. * I tried the gnome-system-monitor, but its the same. * I tried a bit with ps and free but have not found the correct set of arguments / pipes to make them do what I want. It stumped me that I could not google a solution for that. Maybe there is a reason for it? Does anybody have an idea?