Output not being flushed

[mihai-sysbio]

I'm trying to use mediKanren with the entire SemMedDB. I obtained the source db and created a .csv following the same format as indicated in code/sample_semmed.csv, at about 10GB. Everything seems to run fine but it's not creating any output. It seems that everything is kept in RAM until the end - which means the machine ran out of RAM and swap well before that. There doesn't seem to be anything wrong with printing to file on my system (macOS + Racket v7.3), only with flushing at these lines:

mediKanren/code/csv-semmed-ordered-unique-enum.rkt

Lines 42 to 43 in 8b1157b

	(flush-output out-predicate)
	(flush-output out-semtype))

I noticed the todo in README.md dated Nov 27, 2017:
TODO: add SemMedDB files, along with terms of use information for SemMedDB.

What is the recommended solution for this problem?