[nasalgoat]

I was doing about 8GB/s sustained through 1.5 on a single box without issue.

However, you need to run it in multi-process - I found 16 to be a good number. The only drawback is that any monitoring you do is on whichever process you happen to connect to when you check, so you need to multiply by the number of total processes to get accurate numbers. Not sure why the monitoring is per-process, but it's a bit of a pain.