HAProxy

If you're in search of a reliable, fast, and free solution that offers high availability, load balancing, and proxying for your TCP and HTTP-based applications, look no further than HAProxy. This software is particularly beneficial for those running web sites that are under heavy loads and require persistence or Layer7 processing.

With today's technology, supporting tens of thousands of connections is easily achievable. One of the best things about this software is that it makes integrating into your existing architecture risk-free and straightforward. And, it allows you to keep your web servers hidden from the Net while still enjoying all the benefits it provides.

What sets HAProxy apart from other similar software is that it follows an event-driven, single-process model. This model ensures it can support simultaneous connections at lightning fast speeds. In contrast, multi-threaded or multi-process models are unable to handle multiple connections because of system scheduler limits, lock contention, and memory limitations.

Despite the many advantages of event-driven models, they do not scale well on multi-processor systems. To overcome this challenge, optimization plays a crucial role in getting work done from every CPU cycle. Therefore, you can trust HAProxy to handle your high volume traffic and keep your application running smoothly.