RocksDB was taking a bit too much time to compile so I decided to try out icecc. When I executed it I noticed on the icecream-sundae monitor that my “second” machine was not being used. After a lengthy debugging I realized that RocksDB compiles with -march=native, which in turn forces icecc to compile local only. The solution to this was simple enough:

PORTABLE=1 make -j${BIG_NUMBER}

Hope this helps whoever is trying to use icecc as a cluster for building