The name of engines and graph partitions are different within latest release and snapshot code (sorry for confusion). 

Latest release code:
	plsync: hybrid engine w/o opt
	hybrid: random hybrid-cut
	hybrid_ginger: hybrid-cut with heuristic

Snapshot code:
	plsync_orig: hybrid engine w/o opt
	plsync: hybrid engine w/ opt (locality-conscious graph layout)
	hybrid: random hybrid-cut only for plsync_orig engine
	hybrid_fennel: hybrid-cut with heuristic only for plsync_orig engine
	mix: random hybrid-cut only for plsync engine
	mix_fennel: hybrid-cut with heuristic only for plsync engine