How NGINX's Event-Driven Architecture Handles Thousands of Connections Efficiently

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NGINX overcomes the classic C10K problem by replacing the traditional one-thread-per-connection model with a master-worker architecture built on non-blocking, event-driven loops. A single master process handles privileged tasks like reading configuration and binding ports, while multiple worker processes — ideally one per CPU core — manage all actual request handling. Each worker uses the Linux kernel's epoll mechanism to monitor thousands of connections simultaneously, acting only when data is ready rather than waiting idle on I/O. This design allows NGINX to handle tens of thousands of concurrent connections with minimal memory and CPU overhead. Configuration reloads are also seamless, as the master spins up new workers with updated settings while old workers gracefully finish existing requests before exiting.

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