This article provides a concise introduction to CPU cache architecture, explains read/write policies, describes cache coherency protocols such as MESI and its variants, and discusses how different memory models affect multi‑core consistency and performance.
This article explains a rare MySQL replication scenario where Seconds_Behind_Master stays at zero while the slave cannot receive updates, analyzes the underlying push‑based replication mechanism, and offers practical steps and configuration tweaks to detect and prevent the issue.
The article details Douban's comprehensive platform architecture, describing its online load‑balancing layer, the BeansDB key‑value store, the internal DAE PaaS, the big‑data DPark engine, and the team and operational practices that support both online and offline workloads.
This article explores several under‑used yet useful Google Guava utilities—including unsigned primitive types, 128‑bit MurmurHash, InternetDomainName parsing, class‑path reflection, and CharMatcher string handling—providing code examples and explanations of how they can improve Java development efficiency.
This article recounts how the Mobile Taobao team transformed a monolithic app into a modular, multi‑bundle system, introduced automated build, test, and release platforms, and refined processes and quality‑assurance practices to achieve fast, reliable continuous delivery at massive scale.
This guide presents a collection of practical Unix/Linux command-line techniques—including safe file deletion, terminal session recording, directory restoration, permission management, output formatting, user information retrieval, and efficient navigation—to help users boost productivity and manage systems more effectively.
This article explains the four‑step online data migration process—including dual‑write, historical data transfer, read cut‑over, and cleanup—using a real‑world MySQL‑to‑HBase fan‑list case study, and provides practical tips for ensuring zero‑downtime and high data consistency.
This article explains how support vector machines work, how to handle non‑linear and multi‑class problems, and provides a complete R implementation using the e1071 package, including linear and radial kernels, model evaluation, parameter tuning, and visualisation with grid plots.
The article examines the progressive evolution of image server architectures—from early NFS‑based setups through distributed storage with load balancing and caching, to modern cloud‑based solutions like Alibaba OSS—highlighting design considerations, performance trade‑offs, and implementation details for scalable, high‑availability image services.
This article surveys a collection of seminal algorithms—including Huffman coding, public‑key encryption, Dijkstra's shortest‑path, binary search, quicksort, Karatsuba multiplication, Euclid's GCD, Bresenham's line drawing, and the fast inverse square‑root—explaining their origins, principles, and lasting impact on computer science.
This guide explains what the slay command‑line tool does, how to install it on major Linux distributions, and provides step‑by‑step usage examples for terminating every process belonging to a chosen user with administrative privileges.
During the 11.11 shopping festival Xiaomi’s push service delivered 9.65 billion messages at an average of 670 k per minute, maintaining smooth operation without congestion through a multi‑datacenter, XMPP‑based architecture with Thrift serialization and extensive caching.
The article analyzes how long‑running software projects inevitably suffer architectural decay due to growing codebases, team size, and build complexity, and proposes practical strategies such as modularization, phased and distributed builds, component isolation, and disciplined technology adoption to keep systems sustainable.
This article compiles a comprehensive list of open‑source tools covering backup, cloning, cloud platforms, cloud workflows, distributed file systems, cloud storage, code review, collaboration suites, CMDB, configuration management, continuous integration/deployment, DNS, hosting control panels, IT asset management, and LDAP, providing a valuable resource for IT professionals.
This article examines how load‑balancing technologies such as Nginx, LVS, and HAProxy are chosen according to website scale, outlines their respective strengths and weaknesses, and describes typical deployment stages from simple single‑point setups to complex multi‑layer architectures.
The article outlines thirteen critical production‑related mistakes—from not externalizing configuration and using inadequate test data to neglecting security, documentation, disaster‑recovery planning, and proper capacity planning—providing actionable guidance for developers and architects to improve system stability and performance.
This guide walks you through essential Linux shell tricks—from listing non‑owned processes and the top CPU hogs, to using rsync for selective backups, finding the largest files, filtering today's files, transferring data with netcat, backing up the boot sector, and securing log files with immutable attributes.
This article examines how WhatsApp grew its user base, message volume, and infrastructure dramatically over two years while keeping the engineering team at ten, detailing the architectural choices, Erlang‑based stack, hardware scaling, decoupling strategies, and the operational challenges that led to both performance gains and a major outage.
The article recounts how a decades‑old, unused code path was unintentionally re‑activated during a rushed deployment of the Retail Liquidity Program, leading Knight Capital to send erroneous orders that caused a $460 million loss and the firm’s bankruptcy.
This article explains the concept of an inode, its role in storing file metadata, its size and structure on disk, how inode numbers are used, and the differences between hard links, soft links, and directory entries in Unix/Linux systems.
