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The Reactor Pattern's present in a lot of production infrastructure (Nginx, Eventmachine, 0mq, Redis), yet not very well understood by developers and systems fellas alike. In this talk we'll have a look at what code is doing at a lower level and also how underlying subsystems affect your event driven services. Below the surface : system calls, file descriptor behavior, event loop internals and buffer management Evented Patterns : handler types, deferrables and half sync / half async work Anti patterns : on CPU time, blocking system calls and protocol gotchas Help us caption & translate this video! http://amara.org/v/FG9j/
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In the talk titled 'In The Loop,' Lourens Naudé discusses the Reactor Pattern and its relevance in event-driven programming, particularly within infrastructure technologies such as Nginx, Eventmachine, 0mq, and Redis. The presentation aims to elucidate the often misunderstood concepts surrounding event-driven systems, focusing on key technical aspects such as system calls, file descriptor behavior, event loop internals, and buffer management. The agenda of the talk encompasses several crucial areas: - **System Calls and I/O**: The session begins with an exploration of system calls and how they enable user processes to access resources managed by the kernel, emphasizing the differences between blocking, non-blocking, and asynchronous I/O. - **Reactive Programming**: Naudé delves into how the reactive pattern supports event-driven architectures, particularly in scenarios where maximizing throughput is essential and less focus is placed on individual request processing speeds. - **Practical Examples**: The example of a trading application that uses the Financial Information Exchange (FIX) protocol illustrates the discussed points, showcasing the complexities of handling I/O for multiple clients. - **File Descriptors**: Naudé explains how file descriptors work within the context of both blocking and non-blocking I/O, underlining key operational differences and performance implications. - **Event Loop Mechanism**: An infinite loop mechanism is introduced as a core component of the Reactor Pattern, which manages changes in the state of file descriptors and executes domain logic through an efficient event handling system. - **Performance Considerations**: The talk warns against common pitfalls such as excessive blocking times and inefficient handling of callbacks that can impact overall application responsiveness and client servicing. - **Best Practices**: Key recommendations include properly scheduling work in ticks to retain responsiveness, optimizing protocol parsing, and embracing non-blocking operations to avoid hindering the event loop’s performance. Overall, Lourens Naudé's presentation emphasizes the importance of understanding the intricacies of the Reactor Pattern, particularly in high-throughput scenarios, while raising awareness of the potential challenges that come with event-driven programming. Developers are encouraged to learn the nuances of I/O operations and adopt efficient practices to leverage this powerful programming paradigm effectively.
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