amilin
Best practices to handle high concurrency?
I want to create a service for online exams that will handle a minimum of 10,000 concurrencies. if i use phoenix as rest api is there any best practice to handle high concurrency ?
Thanks! 
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ruslandoga
I would start with a simple setup and measure it under some synthetic benchmark. 10k connections is not much these days (but might still require modifying ulimits) and modern databases can handle 10k reqs / second on commodity hardware.
So if you plan to run on Linux and use a PostgreSQL database:
- write a simple Elixir app and measure its performance under load with Benchee and k6 or wrk
- tune PostgreSQL if you run it yourself: https://pgtune.leopard.in.ua
- tune Linux kernel to allow for more connections / file descriptors than the default
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