Using 'hey' with 10 parallel senders -- nginx on the receiving side -- for 24 hours. No crash, no long-term growth in memory, stable CPU usage. It's beautiful.
40 Gbit/sec network between sender & receiver. Router memory grew rapidly for first 10 minutes, going from 40 to 60 MB. Then continued to grow slowly all the way out to 3 hours -- growing from 60 to 64 MB. But then continued to the 24 hour mark without ever exceeding 65 MB. CPU stayed between 250 and 285% the whole time. This is only the most basic kind of soak test -- no breaking and making of new connections, etc. So maybe necessary but not sufficient. But at least on this one it did great.
