Load test your application as “real” as possible. I like to use siege for this but there are many tools for the job.

Monitor your server, to manage anything you need to measure things up! For this I loved the uwsgitop tool which gives me a very descriptive live data of the state of the server.

If you are able to setup a instrumentation tool like datadog, nagios or prometheus, the better!

Setup a somaxconn size that makes sense, to me a size of 1024 did on my case. I wouldn’t advice to add a huge number here unless you have a good reason. A good fast service is king and having a huge backlog won’t help that.

To measure this on your tests you can inspect the backlog in a top like fashion with:

watch -n1 "ss -l | grep <socket_name>"

To see the somaxconn backlog current status.

Then I played with processess, threads and ugreen and async to find the best bang for my buck.