![]() This is a result of the pool of available processes, which often has free available threads ready to immediately serve new connections. This method of treating connections encourages better resource utilization, while still maintaining stability. Each process is threaded (a single thread can handle one connection) so one process can handle several requests concurrently. Worker: A parent process is responsible for launching a pool of child processes, some of which are listening for new incoming connections, and others are serving the requested content.This is a safe way to run applications linked to libraries that do not support threading-typically older applications or libraries. Each process is isolated from the others, so no memory is shared between them, even if they are performing identical calls at some point in their execution. Pre-fork: A new process is created for each incoming connection reaching the server.These tasks are performed and controlled by a Multi-Processing Module (MPM).Īpache HTTP comes with three different MPM: This involves opening a socket, processing the request, keeping the connection open for a certain period, handling new events occurring through that connection, and returning the content produced by a program made in a particular language (such as PHP, Perl, or Python). ![]() ![]() One important problem Apache HTTP has to solve, like any web server, is how to handle different processes to serve an http protocol request. The Apache HTTP web server has evolved through the years to work in different environments and solve different needs. Using these techniques it is now possible to redundacize electronics at a functional module-level with a resulting decrease in size, weight, and cost and a net increase in system reliability.The author selected the Open Internet/Free Speech Fund to receive a donation as part of the Write for DOnations program. Metal oxide semiconductor (MOS) techniques decrease the size of these components by several orders of magnitude. Microelectronic circuits enable mixing, blending, voting, and, in general, response shaping to be done on a relatively small number of easily replaced cards. The electronics field has miniaturized even more so. The A320's first flight was in 1987, here's what the Air Force Flight Dynamics Laboratory had to say about the subject (Theory of Closed Loop Flight Control Systems) 20 years earlier: While it's very slow compared to what's available nowadays, that's still 6-25 million cycles a second. I appreciate all answers, and I apologize if my questions require analyzing proprietary technical documents.Īs others have commented, you've underestimated how fast an Intel 80186 found on an early A320 is. However, how can computer hardware from the 80s (such as the Intel i386) be able to sample data quickly and compute Kalman filter within acceptable response times? I understand that the accuracy of PID systems are fully dependent on the feedback they receive, so I would assume that software methods of error correction like Kalman filter would be employed. ![]() how could a PID system handle feedback from a gyroscope and Airbus side stick at the same time)? Would a simple PID controller suffice? If so, how would a single PID system be able to manage feedback data from different sources (i.e. trim), accelerometer and gyroscope data from the IMU, and feedback from the aircraft's control surfaces to re-adjust said control surfaces. ![]() I am wondering what control paradigms are used by Boeing and Airbus to translate pilot settings (i.e. Considering the Boeing 777 as an example, the pilot flying applies force onto their yoke and one of the flight computers (I'm not aware of the architecture(s) of Boeing FBW systems) interprets the input and changes the control surfaces of the plane accordingly. It's a well-established fact that aircraft like the Boeing 777, and all Airbus passenger aircraft that were designed after the A300, feature a digital fly-by-wire control system. ![]()
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