mqtt mosquitto linux connection limit

Question

How are users getting past a 1024 connection limit in Linux in association with doing MQTT for push notification?

I am using Mosquitto server, which I think I read does

Answer 1

For a customer we tested IBM WebSphere MQ's MQTT, increasing the # of concurrent client connections up to 240,000 per queue manager (MQ runtime, you can have many in an MQ cluster). I was told that is something like 10x more than is reasonably handled by an Apache web server. Server CPU during testing was low at <5%. Would have kept increasing the # of concurrent MQTT clients well beyond 240,000 but the lab ran out of load testing client machines. IBM MQ is the pub/sub provider embedded in WebSphere Message Broker ESB so I expect that'd have the same result.