node —-inspect is a great debugger but last I looked the tooling around memory wasn’t very good. As far as I know, the best practice is to use Ben Nooordius’ heapdump tool (which is super flakey between bugs and Linux oom killer) or lldb with a node plugin. Joynet has/had some cool stuff for illuminos based OSes and IBM seems to be working on some tooling but it’s not there yet.