I don’t think there is a way to constrain it to limited resources without eventually hitting some OOM issues. A few of us community guys have put some thoughts into making a DgraphLite or something similar.
This might be interesting to you as well. Ideally, we would like Dgraph to support smaller systems and other environments again, but I believe Dgraph engineers are correct to focus right now on what they are doing best - Dgraph in the Cloud (larger linux machines.)