To emphasize this point, do note that go-ycsb currently only uses a single client, so you’re limited to how much work one thread can generate. This unfortunately means that in its current state, benchmarking real clusters with go-ycsb will likely be more limited by the client than the database, as AJ points out.
I had a large offline reply to siddon about the go-ycsb benchmarking, which I should probably go clean up and post publicly. And hopefully he’ll have some more time available sometime to continue to improve go-ycsb and its ability to benchmark FoundationDB. 