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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to Install and Configure Multihomed ISC DHCP Server on Debian Linux?
The ISC DHCP server is a popular open-source software package that allows network administrators to dynamically allocate IP addresses and configure network settings to clients on a local area network (LAN). In some cases, it may be necessary to configure a server with multiple network interfaces, which is known as a multihomed server. This tutorial will guide you through the process of installing and configuring ISC DHCP server on a Debian Linux system with multiple network interfaces. Prerequisites Before you begin, you will need − A Debian Linux system with root access Two or more network ...
Read MoreHow can kernels context-switch between processes?
Context switching is the process by which the kernel saves the state of a currently running process and loads the state of another process to give it CPU time. It's important to distinguish that a simple transition between user and kernel mode is not a context switch — a context switch specifically involves changing from one process to another. How Context Switching Works The kernel performs context switching through a series of coordinated steps to ensure process states are preserved and restored correctly: The values of the CPU registers are saved in the Process Control Block ...
Read MoreHow to install Everpad Client in Ubuntu
Everpad is an open-source client for Evernote that provides seamless note-taking functionality on Linux systems. While there isn't an official Evernote client for Linux, Everpad bridges this gap by offering native integration with Ubuntu's Unity desktop environment. This tutorial explains how to install Everpad client in Ubuntu. Everpad supports Unity Lens integration, allowing you to search through your notes directly from the Unity dashboard and open them for editing. The application provides a centralized interface to create, organize, and manage all your Evernote notes from a single location. Installing Everpad Step 1 − ...
Read MoreLearn Modern Service Management System (Systemd) on Linux
systemd is a modern system and service manager for Linux operating systems. Running as the first process on boot (PID 1), it acts as an init system that initializes and maintains userspace services, replacing traditional SysV init scripts with a more efficient service management framework. systemd provides comprehensive system initialization, service management, and system state control through its suite of tools, primarily systemctl for service control and systemd-analyze for performance analysis. Basic systemd Information To get help information about systemd, use the following command − $ systemd -h Starts up and maintains ...
Read MoreCompare and analyze any two major variations of message passing systems
Message passing systems enable processes to communicate by sending and receiving messages. Let us compare and analyze two major variations of message passing systems that demonstrate different architectural approaches and use cases. Client-Server Message Passing In client-server message passing, communication follows a request-response pattern where clients request services from servers. Consider an application reading data from a filesystem — the application acts as a client requesting data from a server. Server Process States The server process transitions through several states during message handling: Server Process State Transitions ...
Read MoreWhat is Zombie Process in Linux?
A zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child's exit status. Once this is done using the wait() system call, the zombie process is eliminated from the process table. This is known as reaping the zombie process. Zombie Process Life Cycle Parent Process Child Process ...
Read MoreWhat is Interprocess Communication?
Interprocess Communication (IPC) is the mechanism provided by the operating system that allows processes to communicate with each other. This communication could involve a process letting another process know that some event has occurred or the transferring of data from one process to another. Interprocess Communication Process A PID: 1234 Process B PID: 5678 Operating System Data/Messages Data/Messages ...
Read MoreWhat resources are required to replace/modify at the core level of the operating system?
Operating System core modification refers to making fundamental changes to the kernel, system components, and underlying architecture. This requires extensive resources, expertise, and careful planning to ensure system stability and compatibility. Core Operating System Architecture Operating System Architecture Layers User Applications & Programs System Libraries & APIs Operating System Kernel (Process Management, Memory Management, Device Drivers) Hardware Abstraction Layer (HAL) ...
Read MoreWhat are the levels of computer system organization?
The computer system level hierarchy is a conceptual framework that describes different abstraction layers from the lowest hardware level to the highest user level. This hierarchy explains how computational activities are organized and how users interact with computer systems through various interfaces and abstraction layers. The computer system consists of seven distinct levels, each building upon the previous level to provide increasing abstraction and functionality. These levels bridge the gap between raw hardware and end-user applications. Levels of Computer System Organization Computer System Level Hierarchy ...
Read MoreWhat are interrupts and how interrupt handling is done in modern operating systems?
Interrupts are signals generated by hardware or software when a particular event requires immediate attention from the processor. These signals inform the CPU about high-priority, urgent information that demands interruption of the current working process to handle time-critical tasks. When an interrupt occurs, the processor completes the current instruction execution and transfers control to a special routine called an Interrupt Service Routine (ISR) or interrupt handler. This mechanism ensures that critical events are processed promptly without losing system responsiveness. Types of Interrupts Classification of Interrupts Interrupts ...
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