2M fully loaded concurrent WebSockets
oatpp benchmark for 2 Million fully-loaded concurrent websocket connections.
2M fully loaded concurrent WebSockets launched on May 7, 2019 with 158 votes, #147 of 3,072 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 7 years on.
In plain words
This is a benchmark demonstration of the oatpp framework managing 2 million concurrent WebSocket connections simultaneously. The server listens across 100 ports and echoes back client messages with a prepended greeting, while the client application establishes 20,000 connections per port. The benchmark shows the framework's capability to handle fully-loaded, persistent WebSocket connections at scale by distributing client load across multiple ports to avoid system limitations.
written from the facts on this page · September 2026
From the sources
This article describes oatpp benchmark for 2 Million fully-loaded concurrent websocket connections. Server application listens to 100 ports from 8000 to 8099 (in order to prevent ephemeral ports exhaustion on the client - as we running all 2m clients on the same machine). Once there is a message on WebSocket, server will echo client's message adding "Hello from oatpp!" at the beginning. Client application opens 20k connections on each port, waits all connections are ready (all WebSocket handshakes are done) then starts the load. 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…from oatpp.io
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