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Prefork Pitfalls | TechSNAP 404

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We turn our eye to web server best practices, from the basics of CDNs to the importance of choosing the right multi-processing module.

Plus the right way to setup PHP, the trouble with benchmarking, and when to choose NGiNX.

Links:

  • Jim's Blog: Installing WordPress on Apache the modern way — It’s been bugging me for a while that there are no correct guides to be found about using modern Apache 2.4 or above with the Event or Worker MPMs. We’re going to go ahead and correct that lapse today, by walking through a brand-new WordPress install on a new Ubuntu 18.04 VM.
  • Apache Performance Tuning — Apache 2.x is a general-purpose webserver, designed to provide a balance of flexibility, portability, and performance. Although it has not been designed specifically to set benchmark records, Apache 2.x is capable of high performance in many real-world situations.
  • Tuning Your Apache Server
  • worker - Apache HTTP Server Version 2.4 — This Multi-Processing Module (MPM) implements a hybrid multi-process multi-threaded server. By using threads to serve requests, it is able to serve a large number of requests with fewer system resources than a process-based server.
  • event - Apache HTTP Server Version 2.4 — The event Multi-Processing Module (MPM) is designed to allow more requests to be served simultaneously by passing off some processing work to the listeners threads, freeing up the worker threads to serve new requests.

  • PHP-FPM — PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites.
  • FastCGI overview — FastCGI is a way to have CGI scripts execute time-consuming code (like opening a database) only once, rather than every time the script is loaded. In technical terms, FastCGI is a language independent, scalable, open extension to CGI that provides high performance without the limitations of server specific APIs.

  • Alexa Top 500 Global Sites
  • What Is a CDN? How Does a CDN work? — A content delivery network (CDN) refers to a geographically distributed group of servers which work together to provide fast delivery of Internet content.
  • W3 Total Cache – WordPress plugin — W3 Total Cache improves the SEO and user experience of your site by increasing website performance, reducing load times via features like content delivery network (CDN) integration and the latest best practices.

  • krakjoe/apcu: APCu - APC User Cache — APCu is an in-memory key-value store for PHP. Keys are of type string and values can be any PHP variables.

  • PHP: APCu - Manual
  • Introduction to Varnish — Varnish HTTP Cache — Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architectur
  • ab - Apache HTTP server benchmarking tool — ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give you an impression of how your current Apache installation performs. This especially shows you how many requests per second your Apache installation is capable of serving.
  • HTTP(S) Benchmark Tools
  • jimsalterjrs/network-testing — This is a small collection of GPLv3-licensed tools to assist an intrepid researcher in testing the performance of networks, wired or wireless.

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