SEARCH KEYWORD -- Weak reference
Why is single threaded Redis so fast
Redis is a high-performance, in-memory key-value database. According to official test reports, it can support around 100,000 QPS (queries per second) on a single machine. However, Redis uses a single-threaded architecture in its design. Why does Redis still have such high performance with a single-threaded design? Wouldn't it be better to use multiple threads for concurrent request processing? In this article, let's explore why Redis has a single-threaded architecture and still maintains its spe...
REDIS,SINGLE-THREADED,MULTI-THREADING 2023-02-28 05:16:22
On Erlang's Syntax
I first planned to release this text as an appendix entry for Learn You Some Erlang, but considering this feels more like editorial content and not exactly something for a reference text, I decided it would fit better as a blog post. Many newcomers to Erlang manage to understand the syntax and program around it without ever getting used to it. I've read and heard many complaints regarding the syntax and the 'ant turd tokens' (a subjectively funny way to refer to ,, ; and .), how annoying...
JavaScript as a First Language
At Khan Academy we've been investigating teaching Computer Science to students in some new and interesting ways. The most interesting aspect of which is that we're likely going to be teaching them JavaScript as their first language. We're in a very unique position as we're primarily aiming to teach students who've been through our previous math and science-centric curriculum. Because of this we can create some rather compelling exercises and projects that never would've been feasible other...
JavaScript,Learning,First language,Inheritence,Prototype 2011-12-23 07:53:45
#46 – Why software sucks
No one makes bad software on purpose. No benevolent programmer has ever sat down, planning out weeks of work, with the intention of frustrating people and making them cry. Bad software, or bad anything, happens because making things is hard, making good things doubly so. The three things that make it difficult are: Possessing the diverse skills needed not to suck.Understanding who you’re making the thing for.Orchestrating the interplay of skills, egos and constraints over the course of...
Software design,Sucks,Software industry 2012-03-19 13:10:37
Automatically post to Facebook from PHP script
Facebook is currently on of the most important publishing and traffic generating sources for many websites. Manually Cross publishing content on your own site and Facebook seems like a lot of extra work. This post guides you through the creation of a Facebook application that can automatically post messages and other types of content on your Facebook wall. Getting started Building a php script that automatically posts status updates on your wall requires the following steps: Download Faceboo...
File upload once again
File upload is one of the oldest operation of web design. After 20 years, it's still has no big change, difficult to handle, lack of interaction and poor user experience. Web developers have thought many methods to improve the experience of uploading file in web apps, they developed various plugins based on different JavaScript libraries. However, because of the difference among different web browsers, there is no common interface which makes these plugins work properly or easily on all web brow...
Web design, File upload, Asynchronous,HTML5 2012-09-02 11:52:21
SQLite C/C++ function interfaces
Some simple introduction to the SQLite function interfaces. First let's check some error codes defined in SQLite3 (They are in SQLite3.h file in the SQLite installation).#define SQLITE_OK 0 /* Successful result */ /* beginning-of-error-codes */ #define SQLITE_ERROR 1 /* SQL error or missing database */ #define SQLITE_INTERNAL 2&nb...
SQLite,Function interface,C/C++ 2012-07-04 12:23:43
How to play with cross domain request
What is cross domain request In simple, cross domain request is to request resource from other domain in one domain. Note, the "other domain" doesn't just mean domain name only, it includes much more. If the protocol, domain name, port is not the same, two domains will be considered different. Below example describes what is considered as different domain. http://www.a.com/a.jshttp://www.a.com/b.js # Same domainhttp://www.a.com/lab/a.js &nb...
FRONT END,JSONP,CROSS DOMAIN,CROSS ORIGIN,CORS,DOCUMENT.DOMAIN,WINDOW.NAME 2016-11-06 00:48:54
Simple Animation in the HTML5 Canvas Element
HTML5 is generating all kinds of buzz these days. Some of the buzz is about HTML5 being a replacement for Adobe’s Flash. I don’t think it’s there yet but it’s certainly on the way to changing the way content is presented on the web. This is a description of a very simple animation in an HTML5 canvas element. It is coded for readability and not for optimized operation. We’ll add a canvas element to a web page and then use javascript to draw on it. We will...
HTML5,Canvas,Animation,Sample code 2011-07-01 10:20:08
Understanding PGO in GoLang 1.20
Background The Go 1.20 version was officially released in February 2023, it introduced the PGO(Profile Guided Optimization) mechanism. The basic principle of PGO can be divided into the following two steps: First, profiling is performed on the program to collect data about the program's runtime and generate a profiling file. When compiling the program, enable the PGO option, and the compiler will optimize the program's performance based on the content in the .pgo file. When compiling a program...
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