Research areas: Windows & Linux platforms, C/C++ backend development, embedded systems and Linux kernel, etc.
This comprehensive guide explains the DNS system, covering its core concepts, hierarchical domain structure, server types, configuration files, detailed resolution workflow, common record types, performance‑boosting optimizations, and step‑by‑step troubleshooting methods for typical DNS failures.
This guide walks Linux operators through the fundamentals of memory management, explains key metrics, and provides step‑by‑step instructions for using tools like top, free, vmstat, pmap, valgrind, smem, smaps and slabtop to pinpoint and resolve memory leaks and excessive memory consumption in production systems.
This article explains the fundamentals of Linux memory mapping (mmap), covering its API, parameters, shared vs. private modes, kernel internals, page‑fault handling, performance benefits, zero‑copy I/O techniques, practical code examples, and common pitfalls for developers.
This comprehensive guide walks Linux newcomers through core command‑line fundamentals, covering command syntax, built‑in and external utilities, file and directory management, permission handling, process monitoring, networking tools, compression, package management, and advanced techniques like piping, find, grep, awk, and sed, with practical examples and tips for effective learning.
This comprehensive guide explores the Linux kernel file system architecture, covering fundamental concepts such as inodes, dentries, superblocks, logical blocks, the VFS layer, common on‑disk filesystems, mounting procedures, and a deep dive into the proc virtual filesystem with code examples and practical usage tips.
This comprehensive guide explains why race conditions occur in Linux processes, explores the underlying concepts of critical sections and synchronization, and provides practical examples of atomic operations, mutexes, semaphores, condition variables, read‑write locks, and spinlocks to ensure safe concurrent programming.
This article demystifies Ethernet by explaining the roles of MAC and PHY within the network protocol stack, covering OSI and TCP/IP models, data encapsulation, ARP address resolution, hardware interfaces like MII/MDIO, and practical troubleshooting tips for real‑world network devices.
This article explains the fundamentals of zero‑copy, DMA, PageCache and RDMA, compares them with traditional I/O, describes Linux implementations such as sendfile, mmap+write, splice and Java NIO APIs, and shows practical use‑cases that dramatically reduce CPU load and latency in high‑throughput networking and file handling.
This comprehensive guide breaks down Linux inter‑process communication (IPC) by explaining its core concepts, why it’s needed, and detailing six mechanisms—pipes, named pipes, message queues, shared memory, semaphores/PV operations, signals, and sockets—complete with code samples, diagrams, and real‑world usage scenarios.
This article provides a comprehensive guide to Linux TCP development, explaining the role of system calls, the three‑way handshake and four‑way termination, detailing core socket functions such as socket, bind, listen, accept, connect, read/write, recv/send, and includes complete example code for building a simple TCP server and client with troubleshooting tips.
