Learn about ten free, open‑source tools—including Grinder, JMeter, and Siege—that let you simulate concurrent users, measure performance, and identify bottlenecks in web applications, helping you assess server capacity and optimize site responsiveness under load.
Tcpcopy is a distributed online pressure testing tool that copies live traffic to test machines, enabling realistic simulation of production environments without deploying new code, and the article explains its principles, code details, deployment steps, advanced usage, and real‑world application at Yitao.
This article details a real‑world Linux server intrusion, showing how a rootkit exploited an Awstats script vulnerability, the forensic steps to identify malicious processes, hidden files, and compromised accounts, and the recommended remediation actions to restore a secure environment.
This article explains the concept of digital signatures, their role in verifying data integrity and origin, outlines common algorithms such as RSA, DSS, and hash‑based signatures, and details the full PKI‑based workflow—including authentication, signing, and verification—while also describing how to combine encryption with signatures for confidential transmission.
This article explains what MySQL table partitioning and sharding (splitting tables) are, compares their implementation, data handling, performance impact, and difficulty, and shows how they can complement each other for high‑traffic, large‑data scenarios.
This guide presents practical Linux system tweaks and PHP configuration adjustments—including file descriptor limits, disabling atime, using tmpfs, and optimizing php.ini and PHP‑FPM settings—to dramatically improve high‑load PHP application responsiveness and stability.
In a June 28 presentation at Baidu’s 51st Technology Salon, senior NLP researcher Zhao Shiqi showcased Baidu Kaoba—a conversational search tool for college admissions—illustrating how inference‑based rewriting, ellipsis completion, concept clarification and interactive generation enable deep, domain‑specific semantic understanding that he predicts will power future internet services.
This article provides a comprehensive, English-language reference of common regular expression metacharacters, explaining their meanings, usage rules, and examples for pattern matching in programming languages such as JavaScript.
This comprehensive tutorial walks you through Redis Cluster fundamentals, including installation, hash slot sharding, node replication, fault tolerance, configuration files, cluster creation commands, and client testing, all without delving into complex distributed theory.
The article examines how Baidu’s newly launched AI‑powered “KaoBa” lightweight app is helping Chinese high‑school graduates choose universities, illustrates the broader surge of AI services in China, compares Baidu’s approach with rivals such as Google, IBM, Facebook and Microsoft, and discusses the potential impact on education, healthcare and other industries.
This comprehensive guide, originally a white‑paper by Gene Kim, explains what DevOps is, how it differs from Agile, ITIL and visible ops, outlines its core principles, application domains, business value, and practical patterns for integrating security, QA, and continuous delivery into modern IT workflows.
This guide walks through practical Python web‑scraping techniques using urllib2, covering basic page fetching, proxy usage, cookie handling for logins, form submission, header spoofing, anti‑hotlink tricks, multithreaded crawling, and strategies for bypassing simple captchas, all illustrated with code snippets.
This guide explains how to use lsof and the /proc filesystem to locate open file descriptors of deleted logs or database files and restore their contents while the owning process remains active.
This article clarifies Unix I/O models by distinguishing synchronous and asynchronous operations, explaining blocking versus non‑blocking behavior, and summarizing the five classic I/O models with practical insights drawn from Richard Stevens' authoritative definitions.
Google announced at I/O that its Dart language will soon run on App Engine via managed VMs and custom runtimes, while also supporting Docker deployment, async/await features, and broader Chrome integration, aiming to make Dart a general‑purpose, front‑end and back‑end language with strong tooling and industry adoption.
This guide walks through typical Nginx problems—from socket permission errors and load‑balancing weight settings to cache‑control headers, gzip configuration, high‑concurrency tuning, and debugging directives—offering step‑by‑step fixes and configuration examples for Linux environments.
Learn how to install Celery, configure it with Redis as a broker, write a simple task to send emails asynchronously, and run workers, all demonstrated with clear code snippets and step‑by‑step instructions for Python developers.
This article explains Facebook's Hiphop tool, its evolution from static PHP-to-C++ compilation to HHVM with JIT, and provides a detailed walkthrough of compiler fundamentals including lexical, syntax, and semantic analysis, intermediate code generation, optimization, and code generation.
This comprehensive guide offers a step‑by‑step learning roadmap for new programmers, covering essential scripting languages, Unix/Linux tools, web fundamentals, advanced C/Java topics, databases, system programming, and practical projects to build solid technical foundations.
Discover practical GitHub shortcuts—including diff whitespace ignoring, author commit filtering, branch comparison URLs, Gist embedding, short URL creation, line highlighting, quick quoting, task lists, and diff/patch retrieval—to streamline your development workflow and save time.
