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Performance test for 2 Million connections

For this test were used two instances in Google-Cloud n1-highmem-8 (8 vCPUs, 52 GB memory) running Debian GNU/Linux 9. One for server, one for client.

Each of 2-million WebSocket clients continuously sends messages to server. Once message is sent client sends another one.

Both server and client applications are running asynchronous oatpp server/client based on oatpp coroutines.

https://oatpp.io/benchmark/websocket/2-million/

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